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7fb3aaf2c1c65d2790bc8b0c934e4fd0710c5638
subsection
38
60
Private and Verifiable Smart Contracts
In order to merge the Private smart contracts (see Section ) and the Verifiable smarts contracts (see Section ), the core of the present work has been re-developed and this will be the version that is going to be open-sourced:private smart contracts are developed in Obliv-Java, a modified Open-JDK for secure computatio...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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8e6c1958056951de9f9d9ec93c68a270c27041ca
subsection
39
60
Detailed Description
In this section we present our secure protocol for private and verifiable smart contracts, specified in the Functionality below:Functionality 6.1: Private and Verifiable Smart Contracts Parties: E_{1},...,E_{N}, set of nodes N_{i} of a blockchain B Inputs: smart contract SC, private inputs from parties E_{1}:\overrig...
{ "cite_spans": [] }
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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5f8693940fd6f2f21206ebae32a833c88367af5a
subsection
40
60
Detailed Description
The parties invoke Functionality 4.1 (Secure computation of smart contracts), implemented using Protocol 4.2 where party E_{1} inputs \overrightarrow{x}, party E_{2} inputs \overrightarrow{y} and the rest of parties E_{N} their corresponding inputs. Parties receive results E_{1}:\overrightarrow{r_{1}}, E_{2}:\overright...
{ "cite_spans": [] }
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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3e2627843c5e2943d506f01d967bb8f601142460
subsection
41
60
Security Analysis
The security analysis follows the standard definition of static semi-honest security in the standalone setting and assumes semi-honest security of basic building blocks: Yao's protocol and oblivious transfer accelerated with OT-extension, , implying the security for the Protocol 4.2 realising Functionality 4.1. Additio...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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d55e8953f56a75debc711baef9727f91c2d1f45e
subsection
42
60
Extended verification of smart contracts
Trusted third parties (e.g., governments, central banks, regulating bodies) may provide specifications against which proofs must be generated. Thus, Gyges attacks can be prevented if parties and executing nodes require that all the executed smart contracts must adhere to said specifications and be digitally signed by t...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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1dc54b76d68acf8e13eae3342f8719a9911aefc2
subsection
43
60
Extended verification of smart contracts
Output: true if the verification was correct, false otherwise.Finally, the general Protocol 6.4 is reviewed with the new Protocol 6.6 for the extended verification of smart contracts:Protocol 6.7: Realising Functionality 6.1 (Private and Extended Verifiable Smart Contracts) Parties: E_{1},E_{2},...,E_{N}, set of nodes...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1959, "openalex_id": "", "raw": "Yehuda Lindell and Benny Pinkas. A Proof of Yao's Protocol for Secure Two-Party Computation. Cryptology ePrint Archive, Report 2004/175, 2004. http://eprint.iacr.org/2004/175.pdf.", "source_r...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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851a22257ac500bc541dcf865aa0bffc28327de4
subsection
44
60
Malicious security
Smart contracts are compiled to efficient Boolean circuits that could be executed on multiple secure computation frameworks with the added benefit of obtaining malicious security, , , , : protocols and theorems above can trivially be updated with their security definitions and proofs. In case of using ORAMs, security a...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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c81721322cf9b01c2f618d78d00d210735b58816
subsection
45
60
Private Function Evaluation
In this setting, the smart contract itself is kept secret: that is, only one of the parties knows the function f\left(x\right) computed by the smart contract, whereas other parties provide the input to the private function without learning about f besides the size of the circuit defining the function and the number of ...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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62fdeb06a62f3cb6afbb7dadd6c864db68911284
subsection
46
60
Economic Impact and Legal Analysis
Previous legal analysis has considered how secure computation fits current legal frameworks, although it's much more interesting to evaluate how it could alter legal frameworks and its economic impact.
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 201, "openalex_id": "", "raw": "Ernesto Damiani. Evaluation and integration and final report on legal aspects of data protection, 2016. https://practice-project.eu/downloads/publications/year3/D31.3-Evaluation-and-integration-and-...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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976e8c099323c2729311f39827fc82416f99a5f4
subsection
47
60
Data Privacy as Quasi-Property
Quasi-property interests refer to situations in which the law seeks to simulate the functioning of property’s exclusionary apparatus, through a relational entitlement mechanism, by focusing on the nature and circumstances of the interaction in question, which is thought to merit a highly circumscribed form of exclusion...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 321, "openalex_id": "https://openalex.org/W2113393063", "raw": "Shyamkrishna B. Alganesh. Quasi-Property: Like, But Not Quite Property, 2012. https://www.law.upenn.edu/journals/lawreview/articles/volume160/issue7/Balganesh160U.Pa....
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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36764a04483e789c7610aada13210b1e71082bfc
subsection
48
60
A Solution to Arrow's Paradox
Arrow's Paradox states that “there is a fundamental paradox in the determination of demand for information; its value for the purchaser is not known until he knows the information, but then he has in effect acquired it without cost”. Ex-ante, the purchaser cannot value the original information since it can only be know...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1515/9781400879762-024", "end": 233, "openalex_id": "https://openalex.org/W3121707495", "raw": "Kenneth Arrow. Economic Welfare and the Allocation of Resources for Invention. In The Rate and Direction of Inventive Activity: Economic and ...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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cb40fc980a41222b0753ddbb73335706e48e911d
subsection
49
60
Expansion of Trade Secrecy
While software copyright and patentability protection have been weakened, trade secrecy stands firm. As defined in the United States' Uniform Trade Secrets Act: “Trade secret means information, including a formula, pattern, compilation, program, device, method, technique, or process, that: (i) derives independent econo...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 619, "openalex_id": "", "raw": "Uniform Law Commission. Uniform Trade Secrets Act with 1985 Amendments, 1985. http://www.uniformlaws.org/shared/docs/trade%20secrets/utsa_final_85.pdf.", "source_ref_id": "8b050fbeab901857d506...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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4182ee6db4ef85a4584a105aa208249c0600c654
subsection
50
60
Verifiability and Self-Enforcement
The term Lex Cryptographia designates a new body/subset of law, containing rules administered through smart contracts and decentralized autonomous organizations: this concept is inspired on Lex Mercatoria, an old subset of customs that became recognized as a customary body of law for international commerce. Smart contr...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.2139/ssrn.2580664", "end": 308, "openalex_id": "https://openalex.org/W4400945", "raw": "Aaron Wright and Primavera De Filippi. Decentralized Blockchain Technology and the Rise of Lex Cryptographia, 2015. http://www.the-blockchain.com/doc...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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6929ecb1114d514aefdc8b17b3853a588faee121
subsection
51
60
Markets for Smart Contracts
Paradoxically, smart contracts are hardly bought/sold: the inexistence of strong property rights hampers the development of markets on smart contracts; actually, not even companies developing and operating them are being acquired/merged based on the value of their smart contracts since they can easily be reverse engine...
{ "cite_spans": [] }
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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e5b09970fd3dc98c310dd04c50c365d5353e7527
subsection
52
60
Effects on Currency Competition
Latest analysis on the monetary policy of cryptocurrencies provide insights on the effects of currency competition:Monetary equilibrium between private cryptocurrencies will not deliver price stability: profit-maximizing entrepreneurs issuing cryptocurrencies do not have real incentives to provide stable currencies, on...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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9cbf9dcb1582fc1426319f5bfcaa3884f22980a6
subsection
53
60
Token vs. Account-based Cryptocurrencies
Most cryptocurrencies are based on the model of issuing and transacting tokens, using some form of distributed ledger to keep track of the ownership of said tokens (e.g., Bitcoin, Ethereum and Zcash): they're the digital equivalents of cash.Another unexplored model of cryptocurrency is that of holding funds in accounts...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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d6e30e3c18029ad469f3e7bc76fed5e3e98bff23
subsection
54
60
Impact on Market Structures
Although disintermediation will be one of the first consequences of the application of cryptographic smart contracts to financial markets, as happened in the past with the introduction of the Internet, bank and fund concentrations may also increase: information asymmetry is associated with more concentration and inform...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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subsection
55
60
The Valuation of Secrecy and the Privacy Multiplier
The use of private smart contracts (see Section ) has inmediate economic benefits for the secured information, because when information is withholden to prevent data leakages then its valuation is discounted. This secrecy discount is given byS_{T}=e^{-yT}\left(2\left(\frac{\sigma \sqrt{T}}{2}\right)-1\right)with T deno...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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abdb460751eb40407f8ce554a4d51e73de7ab0ce
subsection
56
60
Related work
A number of related works using cryptographic techniques are as follows:Enigma, is coded in Python, a language lacking verification libraries/toolkits and formal semantics so it can't be used for proof-carrying code; its cryptographic protocols are not constant-round, thus settings with some latency will be it excrucia...
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1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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1a9017f6cf4f4da87de74806f964377075a908b5
subsection
57
60
Conclusions, subsequent and future work
The present paper has tackled and successfully solved the problem of improving the privacy, correctness and verifiability of smart contracts, resolving the DAO and Gyges attacks. Examples have been shown to demonstrate its practical viability.
{ "cite_spans": [] }
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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subsection
58
60
Subsequent work
The ability to save the state of garbled circuits and restore them at later times is a major improvement, bringing them closer to secret sharing techniques:partial garbled circuits: for each wire value, the generator sends two values to the evaluator, transforming the wire labels of the evaluator to another garbled cir...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.48550/arxiv.1506.02954", "end": 863, "openalex_id": "https://openalex.org/W2952272730", "raw": "Benjamin Mood, Debayan Gupta, Kevin R. B. Butler, and Joan Feigenbaum. Reuse It Or Lose It: More Efficient Secure Computation Through Reuse O...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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e1bd93efce84ceccb1d7718ee31cdfb2acc3e97d
subsection
59
60
Future work
Some encrypted smart contracts will be perpetual (e.g., consols): if they ever store any kind of encrypted secure computation (e.g., secret shares, garbled circuits, homomorphic encryptions, IO) eventually there will be the need to update their encrypted contents to upgrade their security level, a concept that has alre...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/978-3-642-42033-7_13", "end": 346, "openalex_id": "https://openalex.org/W1692720269", "raw": "Kwangsu Lee, Seung Geol Choi, Dong Hoon Lee, Jong Hwan Park, and Moti Yung. Self-updatable encryption: Time constrained access control wit...
1807.09484
Raziel: Private and Verifiable Smart Contracts on Blockchains
[ "David Cerezo Sánchez" ]
[ "cs.CR" ]
2,018
en
Computer Science
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87d70a5ba2b92653387092b29d8209169d798f0d
abstract
0
32
Abstract
We show how increasing returns to scale in urban scaling can artificially emerge, systematically and predictably, without any sorting or positive externalities. We employ a model where individual productivities are independent and identically distributed lognormal random variables across all cities. We use extreme valu...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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9146d272be3f85eaab65848b770a418b2c7c0542
subsection
1
32
Introduction
There is a substantial body of theoretical and empirical research on the origins of “Increasing Returns to Scale” in cities (, , , , ). This urban productivity premium, whereby workers tend to be more productive in larger cities, can be estimated using wages , and is thus referred to as the urban wage premium (from her...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.2307/1885259", "end": 135, "openalex_id": "https://openalex.org/W2069094167", "raw": "Sveikauskas, L., August 1975. The Productivity of Cities. The Quarterly Journal of Economics 89 (3), 393–413.", "source_ref_id": "8ad81f5bc73e99e...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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67cc522d092b9b4d182c05c394020696e84dcd97
subsection
2
32
Introduction
Our analytic results are validated on simulated data, as well as on an administrative dataset of all formal workers in Colombia.To develop the intuition for why individual productivities that are lognormally distributed can give rise to UWP not caused by any sorting or agglomeration effects, it is illustrative to think...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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57c897b22943c02d4fb088758bd3cf6ff64bd5e4
subsection
3
32
Introduction
Assuming independent and identically distributed productivities, denoted in general with the letter X, and assuming the difference in average productivities between the groups is \bar{x}_2 - \bar{x}_1>\epsilon , the likelihood of the conjunction is \Pr (X>\bar{x}_1 + \epsilon )^{n_2} while the likelihood of the disjunc...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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3a37a54827c65a9091a0bf028df50473cd0f8fa1
subsection
4
32
Introduction
Even more, the conjunction and the disjunction examples provide a mathematically correct explanation of large deviations probabilities which describe highly unlikely events (e.g., that the average productivity attains an atypically large value above the expected one).Conjunctions correspond to light-tailed cases, where...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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0d95d5c873ef020e7322c0b69aca385a26f3484a
subsection
5
32
Background
Few studies have addressed the relationship between probability distributions and production functions exhibiting increasing returns to scale (IRS). One of the earliest attempts at connecting a probability distribution with a production function was made by , who showed that a Cobb-Douglas production function arises wh...
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10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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fa667e8ae2961593013638ddf4e41fadf4e41d43
subsection
6
32
Background
In contrast, we will derive our results from a model in which all individuals have productivities that are independently and identically sampled from the same distribution whose moments are all fixed and finite. Under this model, we show that total output shows increasing returns for a wide range of scales, a result th...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.3386/w9931", "end": 601, "openalex_id": "https://openalex.org/W2087956194", "raw": "Duranton, G., Puga, D., 2004. Micro-foundations of urban agglomeration economies. Handbook of regional and urban economics 4, 2063–2117.", "source_...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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fc11f8221d2cab8f72f40cc5d2c03676dcd54cad
subsection
7
32
Analytic Results
Our analytic results are based on a very simple model whereby individuals, regardless of the city they live in, have productivities independently and identically distributed (i.i.d.), sampled from a lognormal distribution \mathcal {LN}(x_0,\sigma ^2), whose probability density function isp_X(x;x_0,\sigma ^2)=\frac{1}{x...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.3982/ecta8442", "end": 1709, "openalex_id": "https://openalex.org/W2145038697", "raw": "Combes, P.-P., Duranton, G., Gobillon, L., Puga, D., Roux, S., 2012. The productivity advantages of large cities: Distinguishing agglomeration from f...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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6c95daa002e2c81bf78bdb8e49a82d7c04f96cd9
subsection
8
32
Elasticity for a single city
Let us proceed by calculating first the change in the expected value of urban output if population size is increased by \lambda >1 according to this simple model:{\mathrm {E}}\left[ Y(\lambda n) \right] &= {\mathrm {E}}\left[ \sum _{i=1}^{\lambda n} X_i \right], \\ &= \sum _{i=1}^{\lambda n} {\mathrm {E}}\left[ X_i \ri...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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bf6c5c2ee1a112e023d629c5a802ca5d2412c852
subsection
9
32
Elasticity for a single city
Thus, for sizes n\rightarrow \infty , the elasticity of total output with respect to size is\beta &=\frac{\mathrm {d}\:\ln (Y(n))}{\mathrm {d}\:\ln (n)} \\ &\approx \frac{\mathrm {d}\:\ln (\mu n)}{\mathrm {d}\:\ln (n)} \\ &=1.In words, a value \beta =1 means that total output increases proportionally with sample size n...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1683, "openalex_id": "https://openalex.org/W1498464051", "raw": "Embrechts, P., Klüppelberg, C., Mikosch, T., 2013. Modelling extremal events: for insurance and finance. Vol. 33. Springer Science & Business Media.", "source_...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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c81f37c47c0459731d32b8e081365bd9912ab974
subsection
10
32
The maximum of lognormal random variables
The random variables representing the productivity of individuals in our model can be conveniently represented as X_i = \text{e}^{\sigma Z_i + \ln x_0}, where Z_1, Z_2, \ldots are i.i.d. random variables sampled from the standard normal distribution \mathcal {N} (0,1). We will consider lognormal distributions with vari...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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b97c2ce5471526e716857a75a9e2d8a412e310a0
subsection
11
32
The maximum of lognormal random variables
ThenY(n) &= \sum _{i=1}^n X_i = \sum _{i=1}^n \text{e}^{\sigma Z_i - \sigma ^2/2} = \text{e}^{\sigma L(n) - \sigma ^2/2} \sum _{i=1}^n \text{e}^{\sigma (Z_i - L(n))}, \\ &= M(n) \sum _{i=1}^n \text{e}^{\sigma (Z_i - L(n))}.The behavior of L(n) (and hence of M(n)) for large n is well-known , : this quantity grows as \sq...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/978-1-4612-5449-2", "end": 468, "openalex_id": "https://openalex.org/W2109246257", "raw": "Leadbetter, M. R., Lindgren, G., Rootzén, H., 1983. Extremes and related properties of random sequences and processes. Springer, Berlin.", ...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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36367b296687b17c93414da199207a3f9a57b94f
subsection
12
32
The maximum of lognormal random variables
The remaining terms \text{e}^{ \sigma (L_i(n) - L(n))} for i \ge 3 decay to 0 much faster since so do exponents with larger negative powers.Thus, we have \Delta _n \approx 1 when \sigma \gg \sqrt{\ln (n)}. Moreover, our simulations (not shown) reveal that a similar conclusion applies even when \sigma is larger than, bu...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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6eb9cbcb433e1266dd0d0378c5f89a4fbc907a6a
subsection
13
32
The maximum of lognormal random variables
For \sigma =4 one needs to increase size to n=10^7 (a ten-thousand-fold increase) in order to decrease the dominance of the maximum to about 10\% (see lightest blue line). The fact that as population size increases (i.e., as the color of the lines become lighter) the dominance of the maximum value over the sum decrease...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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cb7b7dc56e425da40ea2f06fb39fb4307ad6fa1b
subsection
14
32
Elasticity from a cross-sectional regression of many cities
The elasticity of the urban productivity premium effect is a relative rate of change of total output with size. This rate may be different for different sizes. In regression analysis, however, we often estimate empirically an average elasticity across many sizes. Assuming the artificial UWP described in the previous se...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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e8fb9d24624871db5375ad8d54a47744728c281e
subsection
15
32
Elasticity from a cross-sectional regression of many cities
The parameter n_{\min } determines the minimum value above which sizes follow a Pareto distribution.The regression coefficient can be re-written as\beta _{ave}(n_{\min }, \sigma , \alpha ) &= \frac{{\mathrm {E}}\left[ \ln (N)\ln (Y(N)) \right]-{\mathrm {E}}\left[ \ln (N) \right]{\mathrm {E}}\left[ \ln (Y(N)) \right]}{\...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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33a62cc58da36fd1e167cfec7c0ac8978bc0d789
subsection
16
32
Elasticity from a cross-sectional regression of many cities
Hence, researchers often estimate average productivites across cities using samples of the city populations. To model this situation we only need to introduce a new parameter f, a number between 0 and 1, premultiplying n_{\min }, using the convenient property that taking a fixed percentage f of all city sizes does not ...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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986ca23e2d961a08be5b80d945c796d516d39589
subsection
17
32
Simulations
We simulate m=900 synthetic cities using our model. Each city has a population n_k taken from a Pareto distribution with parameters n_{\min }=10,000 and \alpha =1, and for each of them, we generate n_k productivities sampled i.i.d. from eq:lognormalpdf. We will generate simulations for different values of the model par...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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0b3df0d58e21f4ad113ec98047132d2331f115fc
subsection
18
32
Simulations
For each value of \sigma we generated 100 simulations. The values of \widehat{\beta }, \widehat{\ln (Y_0)} and R^2 change systematically with the value of the \sigma -parameters of the individuals' lognormal. As \sigma increases, the scaling exponent also increases, the intercept decreases, and the goodness of the line...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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156844e97a2073cc0f75aae3f2450b7b3218bd31
subsection
19
32
An Application
In sec:analytic we derived eq:predictedbeta, which highlights two important effects. On the one hand, that the elasticity \beta of total output in a city with respect to its population size will increase if the standard deviation of log-productivity, \sigma , increases. On the other, it tells us that \beta will also in...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1550, "openalex_id": "", "raw": "Combes, P.-P., Gobillon, L., 2015. Chapter 5 - the empirics of agglomeration economies. In: Gilles Duranton, J. V. H., Strange, W. C. (Eds.), Handbook of Regional and Urban Economics. Vol. 5 of Han...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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ffc838b71731b3f2bf77ddebf4cea8c0c17a1cbb
subsection
20
32
Data, Descriptives and Distributions
The data used here is the 2014 administrative records of the social security system in Colombia (the Spanish acronym is PILA, for Integrated Report of Social Security Contributions). We refer the reader to the Appendix A for the source, details and preparation of the data, as the dataset has been cleaned and prepared f...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1137/070710111", "end": 1881, "openalex_id": "https://openalex.org/W3103362336", "raw": "Clauset, A., Shalizi, C. R., Newman, M., 2009. Power-law distributions in empirical data. SIAM Review 51 (4), 661–703.", "source_ref_id": "cd2...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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ce0887397209ac845a9ca587c751dad734de0e8f
subsection
21
32
Data, Descriptives and Distributions
Specifically, wages were best fit by the former while sizes were best fit by the latter, as quantified by three criteria: the largest likelihood, the minimum Akaike Information Criterion (AIC), and the minimum Bayesian Information Criterion (BIC). fig:fitdiagnosticsSizes,fig:fitdiagnosticsWages in Appendix C show the d...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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3f42956cb6c4433541a2304c7338c24494b4ad1a
subsection
22
32
Telling Apart Real Versus Artificial UWP
fig:WagesVSSizeScatter plots the cross-section of the average monthly wage per municipality with respect to municipality size. There is clearly a positive and significant elasticity \widehat{\delta }\approx 0.06. [Figure: Larger municipalities have, on average, workers with higher monthly wages.]The strategy to estimat...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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f586db56804fad6a91cc992b7e2898e23406cc2f
subsection
23
32
Telling Apart Real Versus Artificial UWP
To summarize the procedure, first, we will sample without replacement a fraction f of all workers, second, we will estimate the real unconditional elasticity, and third, we will randomize several times the locations of individuals by applying random permutations of the location of individuals in the sample, estimating ...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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39b96517936fe350ba2dea7cc2a8a3ae83f8b9c4
subsection
24
32
Telling Apart Real Versus Artificial UWP
The dotted blue line is the elasticity \delta = \beta _{ave}(f\times n_{\min }, \sigma , \alpha )-1 predicted by eq:predictedbetaave, with values n_{\min }=287, \sigma =2.0, \alpha =0.67, and f=0.001, 0.005, 0.01, 0.05, 0.10 and 1.00. Panel B plots the values of the z-score statistic for each elasticity from the OLS re...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1086/230638", "end": 2689, "openalex_id": "https://openalex.org/W2062337042", "raw": "Clogg, C. C., Petkova, E., Haritou, A., 1995. Statistical methods for comparing regression coefficients between models. American Journal of Sociology 1...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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72fdcf12e9b93f277da4c84e35e0849c5f3e7c96
subsection
25
32
Telling Apart Real Versus Artificial UWP
Under the null hypothesis that these two estimated elasticities are equal, and assuming the number of municipalities large, we can construct the following z-score:z_{\text{stat}} = \frac{\widehat{\beta }^{(\text{real})} - \widehat{\beta _k}^{(\text{rand})}}{\sqrt{(se^{(\text{real})})^2 + (se_k^{(\text{rand})})^2}}which...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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9bb022b82866cf76b026c1c785f01138b3c5002c
subsection
26
32
Discussion and Conclusions
The argument presented here provides evidence for there being a mechanism, previously unaccounted in the urban economics literature, that can give rise to a statistical effect which can be mistaken for a city-size productivity premium. Our goal is to persuade the reader that increasing returns to scale exhibited by dat...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1002/0471457175", "end": 1737, "openalex_id": "https://openalex.org/W1498017815", "raw": "Kleiber, C., Kotz, S., 2003. Statistical Size Distributions in Economics and Actuarial Sciences. Wiley Series in Probability and Statistics. John W...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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46a129e10a84c5008bd1d8bc7756fd7e3909dcb1
subsection
27
32
Discussion and Conclusions
We derived a precise formula to compute the null model elasticity for both a single city and a cross section of cities, the latter being solely a function of the distributional parameters of productivities (\sigma ) and city sizes (n_{\min } and \alpha ). Our approach shifts attention away from the study of averages to...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 595, "openalex_id": "https://openalex.org/W1493484203", "raw": "Gould, S. J., 1996. Full House: The Spread of Excellence from Plato to Darwin. Harvard University Press, Cambridge, MA.", "source_ref_id": "0401f811c0a7aeb9e7e4...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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211dd29ad4b14e312c888d4f8b3be20f20a0d1f6
subsection
28
32
Discussion and Conclusions
We regard the effect we have studied here as a bias, but we distinguish it from other types of statistical biases in that the sampling effect is a real tangible property of a statistical distribution which has consequences on measures of central tendency such as the sample mean. As mentioned in the Background section, ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1162/qjec.2008.123.1.49", "end": 387, "openalex_id": "https://openalex.org/W2154288561", "raw": "Gabaix, X., Landier, A., 2008. Why has ceo pay increased so much? Technology 49.", "source_ref_id": "7e78f922e11e32ca29934be2b3491a0eb...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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8f48fe1996433a521cbd653b45c3aa18b21be129
subsection
29
32
Appendix A. Data
In sec:application we use data of the formal workforce in Colombia to analyze the unconditional elasticity of nominal wages on municipality population size. These come from the administrative records of the social security system in Colombia (abbreviated as PILA in Spanish, meaning the Integrated Report of Social Secur...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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5fa891457a493d523eeee9a3e9f7c979ccf7b5a8
subsection
30
32
Appendix B. The null model
The model of lognormally distributed productivities is built on arguments given by about the distribution of the earnings of individuals. Roy's central assumptions are that (i) earnings are proportional to the output of workers, and (ii) that output is the product of many internal characteristics of the individuals, in...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.2307/2226792", "end": 138, "openalex_id": "https://openalex.org/W2332982556", "raw": "Roy, A. D., Sep. 1950. The Distribution of Earnings and of Individual Output. The Economic Journal 60 (239), 489–505.", "source_ref_id": "46be1cb...
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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c6fe6f2de11a9b9f62a84f2029d0ac387ecbbbec
subsection
31
32
Appendix B. The null model
Hence, we can restate Assumptions 2 and 3 into a single statement: individuals have a productivity X_i i.i.d. sampled from a lognormal distribution \mathcal {LN}(x_0,\sigma ^2) with probability density functionp_X(x;x_0,\sigma ^2)=\frac{1}{x\sqrt{2\pi \sigma ^2}}\text{e}^{-\frac{(\ln x - \ln x_0)^2}{2\sigma ^2}},where ...
{ "cite_spans": [] }
10.1177/2399808320942366
1807.09424
Artificial Increasing Returns to Scale and the Problem of Sampling from Lognormals
[ "Andres Gomez-Lievano", "Vladislav Vysotsky", "Jose Lobo" ]
[ "econ.GN", "physics.soc-ph", "q-fin.EC" ]
2,018
en
Economics
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97061131d2f8197bc0f64ab3cba1aadf21047b23
abstract
0
24
Abstract
Organic molecules such as steroids or amino acids form crystals that can facilitate the formation of ice -- arguably the most important phase transition on earth. However, the origin of the ice nucleating ability of organic crystals is still largely unknown. Here, we combine experiments and simulations to unravel the m...
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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54f8a59275ac67eee111fb5848c084cdcb2e5f28
subsection
1
24
Introduction
The freezing of liquid water into crystalline ice is a ubiquitous phenomenon which is part of our everyday experience  and has countless reverberations in fields as diverse as cryobiology , , and atmospheric science , . Strikingly, the overwhelming majority of ice on earth forms heterogeneously, i.e. thanks to the pres...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1038/494027a", "end": 220, "openalex_id": "https://openalex.org/W1972222459", "raw": "Thorsten Bartels-Rausch. Chemistry: Ten things we need to know about ice and snow. Nature, 494(7435):27–29, February 2013. ISSN 0028-0836. doi: 10.1038...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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b2d8219c1683895f360b67d16e08e7a24da7992e
subsection
2
24
Introduction
We find via micro-litre droplet nucleation measurements (\mu l-NIPI) that CHL crystals display an outstanding ice nucleation ability (stronger than most inorganic ice nucleating agents), with freezing events initiating at very mild supercooling \Delta T_S = T_{\text{Melt}}-T = 4 K down to \Delta T_S = 20 K. Scanning el...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/ja411507a", "end": 1293, "openalex_id": "https://openalex.org/W2327383586", "raw": "Laura Lupi, Arpa Hudait, and Valeria Molinero. Heterogeneous Nucleation of Ice on Carbon Surfaces. J. Am. Chem. Soc., 136(8):3156–3164, February 201...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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6c6212f0c82313f291a2f9772c8d181c9098c75f
subsection
3
24
Body
The ice nucleation efficiency of CHLM was evaluated using an adapted version of the \mu L Nucleation by Immersed Particles Instrument (\mu l-NIPI) described in detail in Ref. . To make the flat plates we dissolved 2g of pure CHL (Sigma Aldrich) in approximately 30 ml of hot (\sim 343 K) 95% ethanol (Sigma-Aldrich). The...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.5194/amt-8-2437-2015", "end": 176, "openalex_id": "https://openalex.org/W2170544731", "raw": "T. F. Whale, B. J. Murray, D. O'Sullivan, T. W. Wilson, N. S. Umo, K. J. Baustian, J. D. Atkinson, D. A. Workneh, and G. J. Morris. A technique...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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a269aaf5832a784f054b48e95e36d1daad3a8d9a
subsection
4
24
Body
SEM was performed with an FEI Nova NanoSEM 450 in high vacuum mode, using an Everhart-Thornley Detector (ETD).
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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d74fceaa9cb2ce9739240b2944a97213b25647a3
subsection
5
24
Molecular dynamics simulations
The computational setup we have used is depicted in Fig. REF a. A single layer of CHL molecules, cleaved along the (001) plane (perpendicular to the normal to the slab) was prepared by starting from the experimental cell parameters and lattice positions . Specifically, a CHLM crystal system made of two mirroring slabs ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1038/260727a0", "end": 255, "openalex_id": "https://openalex.org/W2036313288", "raw": "Bryan M. Craven. Crystal structure of cholesterol monohydrate. Nature, 260(5553):727–729, April 1976. doi: 10.1038/260727a0. URL http://www.nature.com...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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9eb806408024346f4cf97fa5fde8deac67948f3b
subsection
6
24
Molecular dynamics simulations
The Forward Flux Sampling (FFS) simulations reported in this work rely on a massive collection of unbiased Molecular Dynamics (MD) runs, all of which have been performed using the GROMACS package, version 4.6.7. The code was compiled in single-precision, in order to alleviate the huge computational workload needed to c...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1063/1.2408420", "end": 978, "openalex_id": "https://openalex.org/W2057477511", "raw": "Giovanni Bussi, Davide Donadio, and Michele Parrinello. Canonical sampling through velocity rescaling. J. Chem. Phys., 126(1):014101, January 2007. I...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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9e92184906aefbd00067f8bb74e0299ca148a3b6
subsection
7
24
Cholesterol promotes the formation of ice across a wide range of temperatures
We start by experimentally investigating the ice nucleating ability of cholesterol crystals - as a function of supercooling. CHL can crystallise into two different polymorphs, namely anhydrous  (CHLA) and CHLM . The latter is the most relevant to ice formation, as it spontaneously forms in aqueous environments , , , , ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1038/267287a0", "end": 211, "openalex_id": "https://openalex.org/W2023593626", "raw": "H. S. Shieh, L. G. Hoard, and C. E. Nordman. Crystal structure of anhydrous cholesterol. Nature, 267(5608):287–289, May 1977. doi: 10.1038/267287a0. U...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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5d39f9aef17eca3b8b503282c5f6efa14142c050
subsection
8
24
Cholesterol promotes the formation of ice across a wide range of temperatures
It can be seen that CHLM nucleates ice far more efficiently than kaolinite and more efficiently even than the feldspar at warm temperatures. Thus, CHLM has the potential to be a highly efficient ice nucleating agent in immersion mode across a wide range of temperatures - which is the scenario typically encountered when...
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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610b09177285742d07e7eb3c836b372d88f2ec70
subsection
9
24
The role of surface topography
As noted above the spread of freezing temperatures we report for CHLM is very broad. This behaviour suggests that the nucleation behaviour of CHLM is spatially heterogeneous, i.e. different parts of the surface nucleate ice with differing efficiency. This is commonly known as site specific nucleation behaviour , , , , ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.5194/acp-14-5271-2014", "end": 650, "openalex_id": "https://openalex.org/W2109631880", "raw": "G. Vali. Interpretation of freezing nucleation experiments: singular and stochastic; sites and surfaces. Atmos. Chem. Phys., 14(11):5271–5294,...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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892e9c6182e03edbe96091e67b477eced1a5827a
subsection
10
24
The cholesterol-water interface
In order to investigate the molecular-level details of the CHLM-water interface, we have performed unbiased molecular dynamics simulations at strong supercooling (\Delta T_S = 42 K) employing the CHARMM36 , and the TIP4P/Ice  force fields for CHL and water molecules respectively. Computational details and results conce...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/ct900549r", "end": 281, "openalex_id": "https://openalex.org/W2052038479", "raw": "Pär Bjelkmar, Per Larsson, Michel A. Cuendet, Berk Hess, and Erik Lindahl. Implementation of the CHARMM Force Field in GROMACS: Analysis of Protein S...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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df781a7a0a3640bc782d80fef60a835530ebec4b
subsection
11
24
The cholesterol-water interface
Note thatthese cages are made of both 6-membered (panel d, side view) and 5-membered (panel e, side view) hydrogen bonded rings,involving water molecules as well as a hydroxyl group provided by the CHLM surface.]Because of this flexibility of the CHL molecules and the low-density of hydroxyl groups at the water-CHLM in...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/jacs.5b08748", "end": 584, "openalex_id": "https://openalex.org/W3102140724", "raw": "Martin Fitzner, Gabriele C. Sosso, Stephen J. Cox, and Angelos Michaelides. The Many Faces of Heterogeneous Ice Nucleation: Interplay Between Surf...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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dbf5a1dfbddba2ba242f5542e3face3c3c9f4bce
subsection
12
24
The cholesterol-water interface
REF b), we have found that the rather generous cutoff of 5.0 Å\ is sufficient to accommodate the substantial extent of the hydrogen bonded cages depicted in Fig. REF d and Fig. REF e. We have also verified that by choosing the second minimum of the density profile (\sim 7Å) our results, including the trends within the ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/jacs.5b08748", "end": 641, "openalex_id": "https://openalex.org/W3102140724", "raw": "Martin Fitzner, Gabriele C. Sosso, Stephen J. Cox, and Angelos Michaelides. The Many Faces of Heterogeneous Ice Nucleation: Interplay Between Surf...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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45ef660a9601db632788fe2ae2498c74344c3e45
subsection
13
24
Ice nucleation mechanism and kinetics
In order to characterise the mechanism as well as the kinetics of ice nucleation on CHLM^{-OH}_{001} we have performed forward flux sampling (FFS) simulations , , , , , , , . While other enhanced sampling techniques are in principle available, such as metadynamics , transition path sampling , and seeded molecular dynam...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1088/0953-8984/21/46/463102", "end": 174, "openalex_id": "https://openalex.org/W3122702518", "raw": "Rosalind J Allen, Chantal Valeriani, and Pieter Rein ten Wolde. Forward flux sampling for rare event simulations. J. Phys. Cond. Matt., ...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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aca16edad0176b7ad004242b3d4d2c887486a5a0
subsection
14
24
Ice nucleation mechanism and kinetics
The calculated growth probability P(\lambda |\lambda _{0}) as a function of lambda, together with the fraction of ice nuclei that can be found at the water-CHLM^{-OH}_{001} interface are reported in the SI (Fig. S2b). By the time the FFS algorithm has reached \lambda =125, no nuclei within the bulk of the water slab su...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/acs.jpclett.6b01013", "end": 578, "openalex_id": "https://openalex.org/W2410822995", "raw": "Gabriele C. Sosso, Tianshu Li, Davide Donadio, Gareth A. Tribello, and Angelos Michaelides. Microscopic Mechanism and Kinetics of Ice Forma...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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35d87e352a98264c3dfd0b3e0782b22ca9231376
subsection
15
24
Ice nucleation mechanism and kinetics
REF in the SI), which are likely to be characterised by a much smaller interfacial energy if compared to the hemispherical shape predicated by CNT in the case of perfectly flat, featureless substrates. We note however that in order to probe this aspect of CNT quantitatively, it would be desirable to improve the current...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1073/pnas.1509267112", "end": 713, "openalex_id": "https://openalex.org/W2105808663", "raw": "Amir Haji-Akbari and Pablo G. Debenedetti. Direct calculation of ice homogeneous nucleation rate for a molecular model of water. Proc. Natl. Ac...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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f1a37c2fd4bac92ff1162fa2ba5f52d1d47ed484
subsection
16
24
Ice nucleation mechanism and kinetics
Asphericity parameter \alpha and spatial extent of the ice nuclei along the directionnormal to the CHLM slab \Delta Z as a function of \lambda for ice nuclei at the water-CHLM^{-OH}_{001} interface.The insets correspond to top and side views of typical ice nuclei forming at the water-CHLM^{-OH}_{001} interface,containi...
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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12d9c77dacd0769d30ec75fdab1857ea3a5c3635
subsection
17
24
Competition between cubic and hexagonal ice
At the strong supercooling considered here (\Delta T_S = 42 K), homogeneous ice nucleation results in a mixture of ice I_c and ice I_h known as stacking disordered ice I_{sd} , , . However, things can be quite different in the heterogeneous case. For instance, the hydroxylated (001) basal face of kaolinite promotes exc...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1039/c1cp22022e", "end": 180, "openalex_id": "https://openalex.org/W2125138077", "raw": "Emily B. Moore and Valeria Molinero. Is it cubic? Ice crystallization from deeply supercooled water. Phys. Chem. Chem. Phys., 13(44):20008, 2011. IS...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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df1b5878aa5b9ac0a76efab57d43a3d85cd11992
subsection
18
24
Competition between cubic and hexagonal ice
Moreover, we have shown in this work that some of these functional groups - such as the hydroxyl groups characterising the water-CHLM^{-OH}_{001} interface - can even promote a different ice polytype at the same time, possibly according to different supercooling.Finally, we note that, in agreement with previous simulat...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1063/1.4968796", "end": 602, "openalex_id": "https://openalex.org/W2528886579", "raw": "Gabriele C. Sosso, Gareth A. Tribello, Andrea Zen, Philipp Pedevilla, and Angelos Michaelides. Ice formation on kaolinite: Insights from molecular dy...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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7796addea4d9dce2f65e95530608ce9cc50203f0
subsection
19
24
Conclusions
By means of a blend of experiments and simulations, we have unravelled the the origins of ice nucleation on cholesterol (CHL), a prototypical organic crystal of relevance to cryopreservation. Our results suggest that its exceptional ice nucleating activity stems from the ability of its flexible hydrophilic surface to f...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1021/jacs.5b08748", "end": 2221, "openalex_id": "https://openalex.org/W3102140724", "raw": "Martin Fitzner, Gabriele C. Sosso, Stephen J. Cox, and Angelos Michaelides. The Many Faces of Heterogeneous Ice Nucleation: Interplay Between Sur...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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512101dde7b5beb41190bc9f83aea76351106d77
subsection
20
24
Conclusions
In fact, the n_s data reported in Fig. REF b suggest that two populations of potentially different ice nucleating sites may coexist on the CHLM surface. The change in the slope of the CHLM data is reminiscent of that observed for freezing spectra for birch pollen , , which has been attributed to the presence of two dif...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1038/srep08082", "end": 358, "openalex_id": "https://openalex.org/W1981989862", "raw": "D. O'Sullivan, B. J. Murray, J. F. Ross, T. F. Whale, H. C. Price, J. D. Atkinson, N. S. Umo, and M. E. Webb. The relevance of nanoscale biological f...
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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b2837676db5d824dbb6afe6a179cb07ddf27cc34
subsection
21
24
Conclusions
In particular, tailoring the microscopic structure of the substrate and modifying the nature as well as the density of hydrogen-bonding functional groups at the water-substrate interface can be seen as two different routes to engineer the ice nucleating ability of novel cryoprotectants, the design of which, at the mome...
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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e4c321ac03a2c6c2f57714fb957846095f35a248
subsection
22
24
Conflicts of interest
There are no conflicts to declare.
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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19d551467324fa7f0e4d33d175c5403f5e566f5d
subsection
23
24
Supplementary Information
Supplementary Information (SI) can be found at: http://www.rsc.org/suppdata/c8/sc/c8sc02753f/c8sc02753f1.pdf
{ "cite_spans": [] }
10.1039/C8SC02753F
1809.01232
Unravelling the Origins of Ice Nucleation on Organic Crystals
[ "Gabriele C. Sosso", "Thomas F. Whale", "Mark A. Holden", "Philipp Pedevilla", "Benjamin J. Murray", "Angelos Michaelides" ]
[ "cond-mat.soft" ]
2,018
en
Physics
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cf216e4df9e63ce783604960d2c71758a69e6253
abstract
0
61
Abstract
Persistence modules are a central algebraic object arising in topological data analysis. The notion of interleaving provides a natural way to measure distances between persistence modules. We consider various classes of persistence modules, including many of those that have been previously studied, and describe the rel...
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
en
Mathematics
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312b853e3f772760517a37a953a58ac08166d393
subsection
1
61
Introduction
A standard tool in topological data analysis is persistent homology , , , , . It is often applied as follows. One starts with some data, constructs an increasing family of complexes or spaces, and applies homology with coefficients in some fixed field to obtain a persistence module. Next, one computes a summary (e.g. b...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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72c41a05ba69c492c46d2f60d04bc6d57ef529f9
subsection
2
61
Introduction
We identify which of the inclusions in Figure REF are inclusions of open sets (Proposition REF ).We show that these topological spaces are large and poorly behaved in the following ways. They do not have the T_0 or Kolmogorov property (Corollary REF ), they are not locally compact (Corollary REF ), and their topologica...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
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Mathematics
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9fd9a76b8e4efcfa7fe494641cdb4a731c0c11b0
subsection
3
61
Persistence modules and persistence diagrams
Topological data analysis tends to focus on persistence diagrams  rather than persistence modules. Readers more familiar with persistence diagrams may wonder why we work with persistence modules and what our results imply for persistence diagrams.Let us present three responses. First, persistent homology produces persi...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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fa10849b585f652e0becbf281ea1cf0c79e2bd09
subsection
4
61
For the data scientist
For the reader primarily interested in topological data analysis, we would summarize our results by stating that the extended metric space of persistence diagrams with the bottleneck distance is “big”. Say we fix c<d and restrict ourselves to persistence diagrams with finitely many points (a_i,b_i) each of which satisf...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
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Mathematics
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1c009ea965ea6a00d8c3b7dd0755ec8e7e5c19f6
subsection
5
61
Extended pseudometric spaces
The results presented here for extended pseudometric spaces are straight-forward extensions of the standard results for metric spaces (Lemmas REF , REF , REF , and REF and Theorem REF ). However, in order to keep the material accessible to applied mathematicians without a background in point-set topology, we include th...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
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Mathematics
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ecc339a56940bff3ac48274c939b0488ee42d31d
subsection
6
61
Related work
Mileyko, Mukherjee, and Harer  consider the set of persistence diagrams with countably many points in \mathbb {R}^2 together with the topology induced by the p-Wasserstein distance for 1 \le p < \infty . They show that the subspace consisting of persistence diagrams with finite distance to the empty persistence diagram...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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eb23c9cb951b2a4a7687c3b095459345defe74f3
subsection
7
61
Organization of the paper
In Section , we provide background on persistence modules, indecomposable modules, interleaving distance, and pseudometric spaces. In Section , we define the classes of persistence modules that we consider, study the relationships between them, and identify which of them are sets. In Section , we study the basic topolo...
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
en
Mathematics
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0c460fb9bbc19a9817a22dd2f03cd18340c1529d
subsection
8
61
Background
In this section we define persistence modules and interleaving distance, giving examples and basic properties. We also define extended pseudometric spaces and their induced topological spaces.
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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fe55735143c34d079af4e04f234db357c6152fd4
subsection
9
61
Persistence modules
Let \mathbf {k} be a fixed field. A persistence module M is a set of \mathbf {k}-vector spaces \lbrace M(a) \ | \ a \in \mathbb {R}\rbrace together with \mathbf {k}-linear maps \lbrace v_a^b: M(a) \rightarrow M(b) \ | \ a\le b \rbrace such thati) for all a, v_a^a : M(a) \rightarrow M(a) is the identity map, and ii) if ...
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
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Mathematics
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6eaba9f4072c2555128c508e716c71e1778afb84
subsection
10
61
Persistence modules
For simplicity, we will abuse notation and denote this persistence module by [0,2).Example 2.3 Replacing [0,2) in the above with an arbitrary interval J \subset \mathbb {R} we obtain a persistence module that we call an interval module and we will also denote by J.Example 2.4 A trivial but important example is the zero...
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
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Mathematics
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adc5e241ce97355b3a6d9637cf206392aa070de4
subsection
11
61
Indecomposables
Given two persistence modules M and N, their direct sum is the persistence module M \oplus N given by (M \oplus N)(a) = M(a) \oplus N(a) and (M \oplus N)(a \le b) = M(a \le b) \oplus N(a \le b). In the same way we can define the direct sum of a collection of persistence modules indexed by an arbitrary set.A persistence...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
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Mathematics
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27c0524b0f5f506e20920ea70b643a6ee48b30e7
subsection
12
61
Interleaving distance
Interleaving distance was introduced in  and further studied in the context of multiparameter persistence in . Here we also adopt the categorical point of view from .Definition 2.8 Let \varepsilon \ge 0. An \varepsilon -interleaving between persistence modules M and N consists of morphisms \varphi _a: M(a) \rightarrow...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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ab217da353148f8deffd36dd6467defe029356b8
subsection
13
61
Interleaving distance
Then the interleaving distance d_I(M,N) between M and N is defined asd_I(M,N):= \inf \big (\varepsilon \in [0,\infty ) \ | \ M \ \text{and} \ N \ \text{are} \ \ \varepsilon \text{-interleaved} \ \big )If no such \varepsilon exists, then d_I(M,N)=\infty .Example 2.13 The interval modules [0,2] and (0,2) are not 0-inter...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
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Mathematics
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3997e17686899601116ee4537a135ed7fffc5586
subsection
14
61
Pseudometric spaces
Definition 2.16 A pseudometric on a set X is a map d: X\times X \rightarrow [0,\infty ) that satisfiesM1) d(x,x)=0, M2) d(x,y)=d(y,x), and M3) d(x,y)\le d(x,z)+d(z,y)for all x,y,z \in X. Note that we have omitted the condition d(x,y)=0 implies x=y required of metric. More generally, an extended pseudometric on X is a m...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
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ab4508d56040dab92a81677bffb60ffb6345e19d
subsection
15
61
Pseudometric spaces
Note that in an extended pseudometric space we no longer have unique limits, but we do have that if x and x^{\prime } are limits, then by the triangle inequality d(x,x^{\prime }) = 0.A sequence (x_n)_{n \ge 1} in an extended pseudometric space is a Cauchy sequence if for all \varepsilon >0 there exists an N>0 such that...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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43f7534ef73f254b55e7ebb08b0c016e4f484abb
subsection
16
61
Sets and classes of persistence modules
In this section we define classes of persistence modules that contain many of the persistence modules considered in the literature. We study the relationships between these classes and determine which of them are in fact sets.For the remainder of the paper, we will only consider isomorphism classes of persistence modul...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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5896452d1afbe4c2b5460b5dac0fcdc8647710a1
subsection
17
61
Classes of persistence modules
In this section, we consider the classes of persistence modules in Figure REF , which we now describe. [Figure: Hasse diagram of sets and classes of persistence modules.]\mathrm {(pm)} is the class of persistence modules. \mathrm {(id)} is the class of interval-decomposable persistence modules: those isomorphic to \bi...
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10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
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Mathematics
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756b0324761c4b272e1025e44c038fbd6825c972
subsection
18
61
Classes of persistence modules
A persistence module M is said to be constructible  if there exists a finite subset A=\lbrace a_1,\ldots ,a_n\rbrace of \mathbb {R} such thatfor t< a_1, M(t)=0, for a_i \le s \le t < a_{i+1}, M(s\le t) is an isomorphism where i\in \lbrace 1,\ldots ,n-1\rbrace , and for a_n\le s\le t, M(s\le t) is an isomorphism.A con...
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10.1007/s41468-018-0022-4
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Topological spaces of persistence modules and their properties
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Mathematics
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d13a0a8ff075c5a5e4ce3e9462754c282b434c28
subsection
19
61
Inclusions
Lemma 3.2 Let M be an ephemeral module. Then M \cong \bigoplus _{\alpha \in A} M_{\alpha }, where each M_{\alpha } \cong [r,r] for some r \in \mathbb {R}.Let M \in \mathrm {(eph)}. For r \in \mathbb {R}, let M_r be the persistence module with M_r(x) = M(r) if x=r and otherwise M_r(x)=0. Then M \cong \oplus _{r \in \ma...
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
en
Mathematics
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5a9214056fd1fd652038f2bb727490fafca06985
subsection
20
61
Inclusions
\mathrm {(qtame)}\lnot \subset \mathrm {(id)}: \prod _{k=1}^{\infty }[0,\frac{1}{k}) is in \mathrm {(qtame)} but is not in \mathrm {(id)} .
{ "cite_spans": [] }
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
en
Mathematics
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bdc1fe4b45e3ff4fe5cd68ef57b55ea7cdd722a1
subsection
21
61
Almost inclusions
Definition 3.4 Say that a class of persistence modules \mathcal {A} almost includes in a class of persistence modules \mathcal {B} if for each A \in \mathcal {A} there exists an element B \in \mathcal {B} such that d_I(A,B) = 0.Lemma 3.5 A finite sequence of inclusions and almost inclusions is an almost inclusion.This...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.4310/hha.2016.v18.n2.a14", "end": 1085, "openalex_id": "https://openalex.org/W2963276646", "raw": "Frédéric Chazal, William Crawley-Boevey, and Vin de Silva. The observable structure of persistence modules. Homology Homotopy Appl., 18(2)...
10.1007/s41468-018-0022-4
1802.08117
Topological spaces of persistence modules and their properties
[ "Peter Bubenik", "Tane Vergili" ]
[ "math.AT", "math.GN" ]
2,018
en
Mathematics
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