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f8d4060b3300edc5bf1ab29d53f4c6e4d531d703
subsection
1,098
1,121
Equivariant spaces
Given a based H-space Z, the H-equivariant collapse mapl_Z \ : \ G\ltimes _H Z\ \longrightarrow \ Z\wedge S^Lwas introduced in (REF ); here L=T_{e H}(G/H) is the tangent H-representation. The dimension shifting Wirthmüller map\omega _Z \ : \ F(G\ltimes _H Z)\ \longrightarrow \ \operatorname{map}^H(G,F(Z\wedge S^L) )is ...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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610065654d89d4e57afa299aa840047c2ed2376c
subsection
1,099
1,121
Enriched functor categories
In this final appendix we review definitions, properties and constructions involving categories of enriched functors. The general setup consists of:a complete and cocomplete closed symmetric monoidal category {\mathcal {V}} (the `base category'). We denote the monoidal product in {\mathcal {V}} by \otimes ; a skeletal...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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1e5dd02999e98e093ddbc9a42a1014f66ad6a0da
subsection
1,100
1,121
Enriched functor categories
The (d,e)-component of the morphism \alpha is the composite{\prod }_c \ \underline{{\mathcal {V}}}(X(c),Y(c)) \ \xrightarrow{} \ \underline{{\mathcal {V}}}(X(d),Y(d)) \ \xrightarrow{} \ \underline{{\mathcal {V}}}({\mathcal {D}}(d,e)\otimes X(d),Y(e))where the second morphism is adjoint to\underline{{\mathcal {V}}}(X(d)...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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2178ab5ceb5079e16603f44ba29aab918521f826
subsection
1,101
1,121
Enriched functor categories
When applied to the defining equalizer for \underline{{\mathcal {D}}}^\ast (X,Y) this shows that the set of morphisms {\mathcal {D}}^\ast (X,Y) in the functor category {\mathcal {D}}^\ast (i.e., the set of {\mathcal {V}}-natural transformations) can be recovered as the underlying set of the {\mathcal {V}}-object \unde...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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a6b309e5ea391c99acb39f963a951767627da416
subsection
1,102
1,121
Enriched functor categories
For a {\mathcal {V}}-functor Y in {\mathcal {D}}^{\ast }, the evaluation morphism is the composite\underline{{\mathcal {D}}}^{\ast }(d^\ast ,Y)\ \xrightarrow{} \ \underline{{\mathcal {V}}}(d^\ast (d),Y(d)) \ &= \ \underline{{\mathcal {V}}}({\mathcal {D}}(d,d),Y(d)) \\ &\xrightarrow{} \ \underline{{\mathcal {V}}}(I,Y(d)...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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14a3a898367bfe095965de10545ee4a02088f070
subsection
1,103
1,121
Enriched functor categories
This yields the box product of global functors.We denote by {\mathcal {D}}\otimes {\mathcal {D}} the {\mathcal {V}}-category whose objects are pairs of {\mathcal {D}}-objects, and with morphism {\mathcal {V}}-objects({\mathcal {D}}\otimes {\mathcal {D}})((d,d^{\prime }),(e,e^{\prime }))\ = \ {\mathcal {D}}(d,e)\otimes ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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c5b506bb718bfe4c7712409e015675acc7592cd8
subsection
1,104
1,121
Enriched functor categories
Such a Kan extension exists because {\mathcal {V}} is cocomplete and {\mathcal {D}} is skeletally small, see .Remark 4.153 As we saw in the proof of Proposition REF , the box product is an enriched Kan extension along the functor \oplus :{\mathcal {D}}\otimes {\mathcal {D}}\longrightarrow {\mathcal {D}}. We can make t...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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635e48226724daae0ad9842766120d0767895fb9
subsection
1,105
1,121
Enriched functor categories
Indeed, if (X\Box Y,i) and (X\Box ^{\prime } Y,i^{\prime }) are two box products, then the universal properties provide unique morphisms f:X\Box Y\longrightarrow X\Box ^{\prime } Y and g:X\Box ^{\prime } Y\longrightarrow X\Box Y that satisfyf\circ i \ = \ i^{\prime } \text{\qquad respectively\qquad } g\circ i^{\prime }...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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98ca017c511e7178d394736872bc1e5f98345086
subsection
1,106
1,121
Enriched functor categories
So we make the following conventions:(Right unit) We choose X\Box 0^\ast =X with universal bimorphism i:(X,0^\ast )\longrightarrow X given by the maps X(d)\otimes 0^\ast (e)\ = \ X(d)\otimes {\mathcal {D}}(0,e)\ \xrightarrow{} \ &X(d)\otimes {\mathcal {D}}(d\oplus 0,d\oplus e)\\ \cong \ X(d)&\otimes {\mathcal {D}}(d,d...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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060dc721428a0f62be5d5203c2866326bb38ab80
subsection
1,107
1,121
Enriched functor categories
The uniqueness of representing objects gives a unique isomorphism of {\mathcal {V}}-functors\alpha _{X,Y,Z} \ : \ X\Box (Y\Box Z)\ \cong \ (X\Box Y)\Box Zsuch that (\alpha _{X,Y,Z})_{d\oplus e\oplus f}\circ i_{d,e\oplus f}\circ (X(d)\otimes i_{e,f}) =i_{d\oplus e,f}\circ (i_{d,e}\otimes Z(f)).The symmetry isomorphism \...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d7facd924d7f500695a49db952262d3f336f1701
subsection
1,108
1,121
Enriched functor categories
The two types of associativity isomorphisms X\Box (Y\otimes A)\cong (X\Box Y)\otimes A and Y\otimes (A\otimes B)\cong (Y\otimes A)\otimes B are compatible in the sense of a commuting pentagon:@C=-5mm{ && X\Box (Y\otimes (A\otimes B)) [dll]_{X\Box \alpha _{Y,A,B}} [drr]^{\alpha _{X,Y,A\otimes B}}\\ X\Box ((Y\otimes A)\o...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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243fd5a39dfa571250f7b6ef8d637e518b8c1944
subsection
1,109
1,121
Enriched functor categories
The universal properties of the convolution product and of the representable functors show that these two morphisms are inverse to each other.Remark 4.159 (Internal function objects) The box product is a closed monoidal product in the sense that for all objects Y and Z of {\mathcal {D}}^\ast the functor{\mathcal {D}}^...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8ea5dd2d46ebed7c526809922ad9eb107b13c24b
subsection
1,110
1,121
Enriched functor categories
The extension l_m(Z) of an enriched functor Z:{\mathcal {D}}_{\le m}\longrightarrow {\mathcal {V}} is a coequalizer of the two morphisms in {\mathcal {D}}^\ast :@C=8mm{ \coprod _{0\le j\le k\le m} {\mathcal {D}}(\mathbf {k},-)\otimes {\mathcal {D}}(\mathbf {j},\mathbf {k})\otimes Z(\mathbf {j}) @<-.4ex>[r] @<.4ex>[r] &...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8511cafcec97aabc99cde89c37bab2216d501f7a
subsection
1,111
1,121
Enriched functor categories
The m-th latching objectlatching object!of an enriched functorL_m Y - m-th latching object of Y of Y is the {\mathcal {D}}(m)-objectL_m Y \ = \ (\operatorname{sk}^{m-1} Y)(\mathbf {m}) \ ;it comes with a natural {\mathcal {D}}(m)-equivariant morphism\nu _m=i_{m-1}(\mathbf {m})\ :\ L_m Y\ \longrightarrow \ Y(\mathbf {m}...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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4a7705fd518e5f39fc055f4e158688b372dab328
subsection
1,112
1,121
Enriched functor categories
For n>m the latching morphism \nu _n:L_n({\mathcal {D}}(d,-)\otimes A) \longrightarrow {\mathcal {D}}(d,\mathbf {n})\otimes A is an isomorphism. So the skeleton \operatorname{sk}^n ({\mathcal {D}}(d,-)\otimes A) is initial for n<m and \operatorname{sk}^n ({\mathcal {D}}(d,-)\otimes A)={\mathcal {D}}(d,-)\otimes A is th...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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059a0af0fa416d13e315f4848beed10ed7078ab7
subsection
1,113
1,121
Enriched functor categories
Then the square (REF ) evaluates to@C=25mm{ {\mathcal {D}}(\mathbf {m},\mathbf {m})\otimes _{{\mathcal {D}}(m)} L_m Y [r]^{{\mathcal {D}}(\mathbf {m},\mathbf {m})\otimes _{{\mathcal {D}}(m)}\nu _m} [d] & {\mathcal {D}}(\mathbf {m},\mathbf {m})\otimes _{{\mathcal {D}}(m)} Y(\mathbf {m}) [d]\\ L_m Y [r]_-{j_m(\mathbf {m}...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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dcae323574f25556d7a21f88c7bc465847fae683
subsection
1,114
1,121
Enriched functor categories
The original morphism f:A\longrightarrow B factors as the composite of the countable sequenceA=\operatorname{sk}^{-1}[f]\ \xrightarrow{}\ \operatorname{sk}^0[f] \ \xrightarrow{}\ \operatorname{sk}^1[f] \ \longrightarrow \ \cdots \ \xrightarrow{}\ \operatorname{sk}^m [f] \ \longrightarrow \ \cdots \ .If d has dimension ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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a07c26f49c0c5e2551dfff6eac98dfbea167bf53
subsection
1,115
1,121
Enriched functor categories
If the pair(\nu _m i=i(\mathbf {m})\cup \nu _m^B:A(\mathbf {m})\cup _{L_m A}L_m B\longrightarrow B(\mathbf {m}),\quad f(\mathbf {m}):X(\mathbf {m})\longrightarrow Y(\mathbf {m}))has the lifting property in the category of {\mathcal {D}}(m)-objects for every m\ge 0, then the pair (i,f) has the lifting property in the fu...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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6eec6ef200235fff9bde9210fc4caed6e5945b20
subsection
1,116
1,121
Enriched functor categories
We call a morphism f:X\longrightarrow Y in {\mathcal {D}}^\asta level equivalence if f(\mathbf {m}):X(\mathbf {m})\longrightarrow Y(\mathbf {m}) is a weak equivalence in the model structure {\mathcal {C}}(m) for all m\ge 0; a level fibration if the morphism f(\mathbf {m}):X(\mathbf {m})\longrightarrow Y(\mathbf {m}) i...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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fc2bbd1b884d3853a602cd5a991ef0a15d4c0207
subsection
1,117
1,121
Enriched functor categories
Suppose that the fibrations in the model structure {\mathcal {C}}(m) are detected by a set of morphisms J(m); then the level fibrations are detected by the set of morphisms \lbrace G_m j \ | \ m\ge 0,\, j\in J(m)\rbrace \ . Similarly, if the acyclic fibrations in the model structure {\mathcal {C}}(m) are detected by a...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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5faebce37f4e7b99fc2b160aa7437dd467139864
subsection
1,118
1,121
Enriched functor categories
The pushout square (REF ) in level m+n is a pushout of {\mathcal {D}}(m+n)-objects@C=20mm{ {\mathcal {D}}(\mathbf {m},\mathbf {m+n})\otimes _{{\mathcal {D}}(m)}(A(\mathbf {m})\cup _{L_m A}L_m B) [r]^-{{\mathcal {D}}(\mathbf {m},\mathbf {m+n})\otimes _{{\mathcal {D}}(m)} (\nu _m i)} [d] & {\mathcal {D}}(\mathbf {m},\mat...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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761f58207efe5f3bb3d1255f74803f5a50178b8a
subsection
1,119
1,121
Enriched functor categories
Then we have all the data necessary to define the m-th latching object L_m B; moreover, the `partial morphism' q:B\longrightarrow X provides a {\mathcal {D}}(m)-morphism L_m B\longrightarrow X(\mathbf {m}) such that the square{L_m A [r]^-{L_m i} [d]_{\nu _m^A} & L_m B [d] \\ A(\mathbf {m}) [r]_-{f(\mathbf {m})} & X(\ma...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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e177a259b73de10f73b8c832210e17a6aebe9b29
subsection
1,120
1,121
Enriched functor categories
In each of the model structures {\mathcal {C}}(m) the cofibrations have the left lifting property with respect to the acyclic fibrations; so by Proposition REF the cofibrations in {\mathcal {D}}^\ast have the left lifting property with respect to level equivalences which are also level fibrations.We postpone the proof...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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e752dc892ff8475befee1fbb25ccf2594ba6ea37
abstract
0
31
Abstract
We consider the problem of counting motifs in bipartite affiliation networks, such as author-paper, user-product, and actor-movie relations. We focus on counting the number of occurrences of a "butterfly", a complete $2 \times 2$ biclique, the simplest cohesive higher-order structure in a bipartite graph. Our main cont...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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fdbdd594835d05183d163329fc1459d0e6832149
subsection
1
31
Introduction
Graph motifs are used to model and examine interactions among small sets of vertices in networks. Finding frequent patterns of interactions can reveal functions of participating entities , , , , , and help characterize the network. Also known as graphlets or higher-order structures, motifs are regarded as basic buildin...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 232, "openalex_id": "https://openalex.org/W3104563092", "raw": "authorpersonC. Seshadhri, personA. Pinar, and personT. G. Kolda. year2014. Triadic Measures on Graphs: The Power of Wedge Sampling. journalStatistical Analysis and Da...
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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cad662b85b5f1fff473fe25b4edc675481ce6663
subsection
2
31
Introduction
Instead, natural motifs in a bipartite network are bicliques of small size.The most basic motif that models cohesion in a bipartite network is the complete 2 \times 2 biclique, also known as a butterfly , or a rectangle . Although there have been attempts at defining other cohesive motifs in bipartite networks, such as...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1145/3159652.3159678", "end": 222, "openalex_id": "https://openalex.org/W2770225549", "raw": "authorpersonAhmet Erdem Sarıyüce and personAli Pinar. year2018. Peeling Bipartite Networks for Dense Subgraph Discovery. In booktitleWSDM.", ...
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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a8dcd4737be320d9ce22073a7eb2a148613c60d4
subsection
3
31
Introduction
These results show that the algorithms can handle massive graphs with hundreds of millions of edges and trillions of butterflies. Our most efficient sampling algorithm, which we call ESamp+Fast-eBFC, gives estimates with a relative error less than 1 percent within 5 seconds, even for large graphs with trillions of butt...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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23dd957e248668c8f423b1d5d165e8185f2c4e1a
subsection
4
31
Preliminaries
We consider simple, unweighted, bipartite graphs, where there are no self-loops or multiple edges between vertices. Let G = (V, E) be a simple bipartite graph with n=|V| vertices and m=|E| edges. Vertex set V is partitioned into two sets L and R such that V = L \cup R and L \cap R = \emptyset . The edge set E \subseteq...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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fbbaa9aad4cdf37e2ab157ce5f6a45a108a1b6f9
subsection
5
31
Preliminaries
For parameters \epsilon , \delta \in [0, 1], an (\epsilon , \delta )-{}{}approximation of a number Z is a random variable \hat{Z} such that \Pr [|\hat{Z} - Z| > \epsilon Z] \le \delta . }\begin{}[t!] \centering [subfigure]{captionskip=-4ex} \includegraphics [width=0.7]{example.pdf} \vspace{0.0pt} \caption {There are 4 ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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e38f014c95010bf4806035634e7bd0b1ab32c5e5
subsection
6
31
Preliminaries
\end{}\begin{}[t!] \small \centering {}{!}{ \begin{}{|c| @{{}} |r|r|r|r|r|r|} \hline Bipartite graph & |L| & |R| & |E| & \sum _{\ell \in {}L}{d_\ell ^2} & \sum _{r\in {}R}{d_r^2} & \mathbin { \\ \hline \left( 10^4,10 \right)-biclique & {10000} & {10} & {100000} & {1000000} & {1000000000} & {2249775000} \\ \hline \href ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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790f09b1b4ee508684dd11659009992b664ed0c2
subsection
7
31
Preliminaries
L and R are vertex partitions, E is the edge set. The sum of degree squares for L and R, and the number of butterflies are shown. } \vspace{-8.5pt} } \end{}\end{}\vspace{-8.5pt} \section {Related Work} }}\textbf {Bipartite graph motifs:} Modeling the smallest unit of cohesion enables a principled way to analyze network...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2461, "openalex_id": "", "raw": "authorpersonCharalampos E Tsourakakis, personU Kang, personGary L Miller, and personChristos Faloutsos. year2009. Doulion: counting triangles in massive graphs with a coin. In booktitleKDD. pages83...
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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bcbe0a065e18480cdb0d1a3bab70c5253e25fcdf
subsection
8
31
Exact Butterfly Counting
We first present the basic equation for the number of butterflies in a bipartite graph G and the base (state-of-the-art) algorithm by Wang et al.  that implements the equation.Lemma 1For a bipartite graph G = (V = (L \cup R), E),We have two observations about Equation (3) and algo:exactBFC. First, the intersection oper...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1109/bigdata.congress.2014.13", "end": 176, "openalex_id": "https://openalex.org/W2145764405", "raw": "authorpersonJ. Wang, personA. W. C. Fu, and personJ. Cheng. year2014. Rectangle Counting in Large Bipartite Graphs. In booktitle2014 I...
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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ed4485e7bbd283a865293524054bc4b61ecb0a56
subsection
9
31
Performance of Exact Butterfly Counting
We compare the runtime of our algorithm (ExactBFC) with Wang et al.  (WFC). From our theoretical analysis in sec:exact, our algorithm is expected to be faster than WFC. figure:exactVSwang shows a comparison of the runtimes of the two algorithms. We note the following points. (1) ExactBFC is always faster than WFC. This...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1109/bigdata.congress.2014.13", "end": 75, "openalex_id": "https://openalex.org/W2145764405", "raw": "authorpersonJ. Wang, personA. W. C. Fu, and personJ. Cheng. year2014. Rectangle Counting in Large Bipartite Graphs. In booktitle2014 IE...
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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ded75a361b86fdc24483b7b688b5ca7679082921
subsection
10
31
Local Butterfly Counting
We present two algorithms for local butterfly counting, vBFC (algo:local-verBFC) for counting the number of butterflies \mathbin {_v that contain a given vertex v, and {\textsc {eBFC}}~({algo:local-edgBFC}) for counting the number of butterflies \mathbin {_e that contain an edge e. Both algorithms employ procedures sim...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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18ce2415f63110d2d63cb92c74313524a13cffa0
subsection
11
31
Approximation by Local Sampling
In this section, we present approaches to approximating \mathbin {(G) using random sampling. The intuition behind sampling is to examine a randomly sampled subgraph of G and compute the number of butterflies in the subgraph to derive an estimate of \mathbin {(G). Since the subgraph is typically much smaller than G, it ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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60bd9627cdb5c6f9aad997b6e832bca79b2365be
subsection
12
31
Vertex Sampling (Algorithm
The idea in VSamp is to sample a random vertex v and count the number of butterflies that contain v – this is accomplished by counting the number of butterflies in the induced subgraph consisting of the distance-2 neighborhood of v in the graph. We show that the algorithm, described in algo:versamp, yields an unbiased ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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afb02ad8d986f7053df39910e34c1104e47fec0f
subsection
13
31
Vertex Sampling (Algorithm
Triadic closure in two-mode networks: Redefining the global and local clustering coefficients}. {\section {Conclusion} We introduced a suite of algorithms for butterfly counting in bipartite networks. We first showed that a simple statistic about vertex sets, which is cheap to obtain, helps drastically to reduce the ru...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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19b5aa24516f04bea58116b875641f0e78eb3b0c
subsection
14
31
Vertex Sampling (Algorithm
Alon}.} {year}{2002}{}. {Network Motifs: Simple Building Blocks of Complex Networks}. {journal}{\\emph \{Science\}\} {volume}{298}, {number}{5594} ({year}{2002}), {pages}{824--827}. } + p_{1e}p^{-1} + p_{2v}p^{-1}} \\\hline \\texttt \\mml@font@monospace \{Deli\}\\mml@font@normal & 4.047 \times 10^{15} & 9.163 \times 10...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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d22bdcd52307036de4ea38f1d55779ec52e8cac3
subsection
15
31
Vertex Sampling (Algorithm
({year}{2017}). {({\\tt \\mml@font@monospace https://developers.facebook.com/docs/graph-api}).} \\emph \{SIAM J. Comput.\}\} {volume}{7}, {number}{4} ({year}{1978}), {pages}{413--423}. } {year}{1997\unknown\bibitem {DeStefani16} {author}{{person}{L. De~Stefani}, {person}{A. Epasto}, {person}{M. Riondato}, {and} {person...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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dd1a556d26721b61dbdb1a33d06856c6443fba77
subsection
16
31
Vertex Sampling (Algorithm
Seshadhri}, {and} {person}{\frac{}{ESCAPE: Efficiently Counting All 5-Vertex Subgraphs}Vaidyanathan Vishal}.} {year}{bad group22bad group222017}{}. { { Let f : V \rightarrow \lbrace 1,\ldots ,\rbrace *{map to random colors}E^{\prime \bibitem {\left(\@root {\sqrt{\frac{Counting and Sampling Triangles from a Graph Stream...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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7aa913d17e66d04ba7395e97193c36e81460281f
subsection
17
31
Vertex Sampling (Algorithm
Pavan}, {person}{K. Tangwongsan}, {person}{S. Tirthapura}, {\frac{}{}However, \\textsc \{ESpar\}\\mml@font@normal {}~has other downsides when compared with \\textsc \{ESamp\}\\mml@font@normal {}. First, the memory consumption of \\textsc \{ESpar\}\\mml@font@normal {}~is O(mp) where p is a parameter, and is larger than ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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5434ca10dffd6f933196c37718776cf97e4abee0
subsection
18
31
Vertex Sampling (Algorithm
Overall, two algorithms take similar times to reach a 1\% error on all graphs we considered, in the range of 1.7-5 sec, with \\textsc \{ESpar\}\\mml@font@normal {}~achieving this accuracy faster than \\textsc \{ESamp\}\\mml@font@normal {}~with \\textsc \{Fast-eBFC\}\\mml@font@normal {}. journal}{\\emph \{{\left(\@root ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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2e2a45bc6c98ba81ded915f8ed7ffc6a255d9be2
subsection
19
31
Vertex Sampling (Algorithm
To understand this, we begin with {lem:edge-spars,lem:clr-spars} which show expressions bounding the variances in terms of p_{1w}, p_{1e}, and p_{2v}, also summarized in {table:variance-sprs}. The difference in the variance between \textsc {ClrSpar}{}~ and \textsc {ESpar}{}~ boils down to (\mathbin {{}p^{-3}+p_{2v\bibi...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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d03c0f08ff2c7bc84cf4722f0b3f7be2981d6115
subsection
20
31
Vertex Sampling (Algorithm
However, as shown in {figure:jrn-sprs-err-prob,figure:web-sprs-err-prob,figure:wiki-sprs-err-prob}, \textsc {ClrSpar}{}~{}requires a larger sampling probability to achieve a reasonable accuracy. \bibitem {bad group22bad group22Lim15} {author}{{\begin{}{31} \end{}person}{Yongsub Lim} {and} {\bibliographystyle {plain} pe...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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91d68aa3bef520097ceecd07a4f273e1d83992d4
subsection
21
31
Vertex Sampling (Algorithm
Wu, personK. Yi, and personZ. Li. year2016. Counting Triangles in Large Graphs by Random Sampling. journalIEEE TKDE volume28, number8 (year2016), pages2013–2026.The idea in VSamp is to sample a random vertex v and count the number of butterflies that contain v – this is accomplished by counting the number of butterflie...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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c26f8c97097c1f8cc4427f6882de799a830075c0
subsection
22
31
Vertex Sampling (Algorithm
Our best sampling and sparsification algorithms yield less than 1\% relative error within \approx 5 and \approx 4 seconds for all the networks we considered, whereas the state-of-the-art exact algorithm does not complete even in 40,000 secs on the \\texttt \\mml@font@monospace \{Web\}\\mml@font@normal ~graph. Triadic c...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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b6951124986db44251810a580cf7c84e82ab4c53
subsection
23
31
Vertex Sampling (Algorithm
Alon}.} {year}{2002}{}. {Network Motifs: Simple Building Blocks of Complex Networks}. {journal}{\\emph \{Science\}\} {volume}{298}, {number}{5594} ({year}{2002}), {pages}{824--827}. } + p_{1e}p^{-1} + p_{2v}p^{-1}} \\\hline \\texttt \\mml@font@monospace \{Deli\}\\mml@font@normal & 4.047 \times 10^{15} & 9.163 \times 10...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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5c2f2d302be6210421cf3ab349f064dbfb1c3557
subsection
24
31
Vertex Sampling (Algorithm
({year}{2017}). {({\\tt \\mml@font@monospace https://developers.facebook.com/docs/graph-api}).} \\emph \{SIAM J. Comput.\}\} {volume}{7}, {number}{4} ({year}{1978}), {pages}{413--423}. } {year}{1997\unknown\bibitem {DeStefani16} {author}{{person}{L. De~Stefani}, {person}{A. Epasto}, {person}{M. Riondato}, {and} {person...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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c634a134cbc058c1639578653f1b5a1ed4a874ae
subsection
25
31
Vertex Sampling (Algorithm
Seshadhri}, {and} {person}{\frac{}{ESCAPE: Efficiently Counting All 5-Vertex Subgraphs}Vaidyanathan Vishal}.} {year}{bad group22bad group222017}{}. { { Let f : V \rightarrow \lbrace 1,\ldots ,\rbrace *{map to random colors}E^{\prime \bibitem {\left(\@root {\sqrt{\frac{Counting and Sampling Triangles from a Graph Stream...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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67930802f744c0d3e2fc930d24695f20d52f3332
subsection
26
31
Vertex Sampling (Algorithm
Pavan}, {person}{K. Tangwongsan}, {person}{S. Tirthapura}, {\frac{}{}However, \\textsc \{ESpar\}\\mml@font@normal {}~has other downsides when compared with \\textsc \{ESamp\}\\mml@font@normal {}. First, the memory consumption of \\textsc \{ESpar\}\\mml@font@normal {}~is O(mp) where p is a parameter, and is larger than ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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d1fd36bab477889b9e4ce9647d676658b19f9bd5
subsection
27
31
Vertex Sampling (Algorithm
Overall, two algorithms take similar times to reach a 1\% error on all graphs we considered, in the range of 1.7-5 sec, with \\textsc \{ESpar\}\\mml@font@normal {}~achieving this accuracy faster than \\textsc \{ESamp\}\\mml@font@normal {}~with \\textsc \{Fast-eBFC\}\\mml@font@normal {}. journal}{\\emph \{{\left(\@root ...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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c9eea11b49fbc5e8765d20baeec264819dbe4fca
subsection
28
31
Vertex Sampling (Algorithm
To understand this, we begin with {lem:edge-spars,lem:clr-spars} which show expressions bounding the variances in terms of p_{1w}, p_{1e}, and p_{2v}, also summarized in {table:variance-sprs}. The difference in the variance between \textsc {ClrSpar}{}~ and \textsc {ESpar}{}~ boils down to (\mathbin {{}p^{-3}+p_{2v\bibi...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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d050f8779d646465e714ba3105051744d359a92a
subsection
29
31
Vertex Sampling (Algorithm
However, as shown in {figure:jrn-sprs-err-prob,figure:web-sprs-err-prob,figure:wiki-sprs-err-prob}, \textsc {ClrSpar}{}~{}requires a larger sampling probability to achieve a reasonable accuracy. \bibitem {bad group22bad group22Lim15} {author}{{\begin{}{31} \end{}person}{Yongsub Lim} {and} {\bibliographystyle {plain} pe...
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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24bbbc024f472ec87dd9d510e5d13a7ab4674d92
subsection
30
31
Vertex Sampling (Algorithm
Wu, personK. Yi, and personZ. Li. year2016. Counting Triangles in Large Graphs by Random Sampling. journalIEEE TKDE volume28, number8 (year2016), pages2013–2026.
{ "cite_spans": [] }
1801.00338
Butterfly Counting in Bipartite Networks
[ "Seyed-Vahid Sanei-Mehri", "Ahmet Erdem Sariyuce", "Srikanta Tirthapura" ]
[ "cs.DM" ]
2,017
en
Computer Science
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d20927b79ed46bc09f21d009eafdf75c6957bf08
abstract
0
65
Abstract
A new continuum-mechanical formulation is proposed which encompasses all material processes within and surrounding an ice sheet. Using this formulation, the balance of mass and free-surface relations for ice sheets are derived and elaborated upon. The resulting three-dimensional mass-balance relation is then integrated...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.005090254824608564, 0.007051567081362009, -0.0544588565826416, 0.014629712328314781, 0.02313890866935253, 0.020788386464118958, 0.013736818917095661, 0.03287678584456444, 0.017171023413538933, -0.004521702881902456, -0.020208386704325676, 0.014240502379834652, 0.029747845605015755, 0.02...
951699edb71bc5fb22d6b75020ccf526314a8f45
subsection
1
65
Introduction
Continuum-mechanical formulations which describe the dynamics of ice sheets and glaciers are complicated due to varied environmental interactions, including the atmosphere, lithosphere, sub- and supra-surface lakes, the oceans, etc; clearly-defined discontinuities within the ice-sheet interior; water transport within a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1029/2011jf002140", "end": 1132, "openalex_id": "https://openalex.org/W2071341963", "raw": "E. Larour, H. Seroussi, M. Morlighem, and E. Rignot, Continental scale, high order, high spatial resolution, ice sheet modeling using the ice she...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.01778663508594036, 0.010220451280474663, -0.04493947699666023, 0.01989174447953701, 0.03298002481460571, -0.02393416129052639, -0.015429830178618431, 0.002846853341907263, 0.011982334777712822, 0.02764098159968853, -0.015040842816233635, -0.004366573411971331, -0.0143238864839077, 0.026...
7129aba943c0b10b61adccb0c543e5d53f504852
subsection
2
65
The multi-phase cryosphere
Ice sheets and glaciers may be represented as a system of differential multi-phase equations of disperse flow (cf. ). These equations were first stated for binary ice and water mixtures by , which is a modification to concepts developed in . The formulation developed here incorporates statements of vapor conservation, ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511807169", "end": 117, "openalex_id": "https://openalex.org/W4214490774", "raw": "C. E. Brennen, Fundamentals of Multiphase Flow, Cambridge University Press, Pasadena, California, 2005, https://doi.org/10.1017/CBO97805118071...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.013980813324451447, 0.019277038052678108, -0.038828808814287186, 0.012813202105462551, 0.004845969844609499, -0.013820553198456764, -0.018849676474928856, 0.013782395981252193, -0.000026411966246087104, 0.03032737597823143, -0.009676676243543625, 0.007074352353811264, -0.01542315725237131...
b73e4a2c1c22f12b708b4e09b623bebc2daef8d6
subsection
3
65
The multi-phase cryosphere
Imagine within an ice-mixture mass density \rho = \rho (\underline{x},t) which is composed of some amount of solid (\mathrm {s}), liquid (\mathrm {\ell }), and vapor (\mathrm {v}) components, each moving relative to barycentric velocity \underline{u} = \underline{u}(\underline{x},t) defined by satisfying\rho ^{\pm } \u...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1469, "openalex_id": "", "raw": "A. F. Möbius, Der Barycentrische Calcul: ein neues Hülfsmittel zur analytischen Behandlung der Geometrie, Verlag von Johann Ambrosius Barth, Leipzig, 1827, https://books.google.com/books?id=eFPluv_...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ 0.03596968948841095, -0.007619533222168684, -0.016169579699635506, -0.005270367953926325, 0.012340745888650417, -0.01096022967249155, 0.010533108375966549, -0.005922490265220404, 0.014979743398725986, 0.029989995062351227, -0.007032242137938738, 0.024589965119957924, -0.02472725510597229, ...
b268bfadebb4c76ffb50731e1b0167f2da95d9a6
subsection
4
65
The multi-phase cryosphere
For example, the atmosphere boundary will have \rho _{\mathrm {\ell }}^+ = \rho _{\mathrm {w}} in regions in contact with collected surface water, the basal surface may have a range of values \rho _{\mathrm {\ell }}^+ \in [0, \rho _{\mathrm {w}}] depending on the saturation of the sub-glacial aquifer, and \rho _{\mathr...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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94ca62300c49265dfe32abad6ea1457f463956c7
subsection
5
65
The multi-phase cryosphere
The following proposition illustrates that source terms mixturedensitysource,surfacemixturedensitysource are in fact homogeneous:The total rate of change of the mass density \rho = \rho (\underline{x},t) and surface-mass density q = q(\underline{x},t) given by mixturedensitysource and surfacemixturedensitysource are re...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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8f495add8d8dd6e2e60d4a71d34a0fdf0e86ab49
subsection
6
65
The multi-phase cryosphere
Finally, insertion of solidliquidreactionpair,solidvaporreactionpair,liquidvaporreactionpair into solidmassreaction,liquidmassreaction,vapormassreaction and taking the sum results in thmhomogeneoustotalmassreaction.The mass changes along surface encompassed by relations solidmassreaction,liquidmassreaction,vapormassrea...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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4f66b64ba7c44909224b13c2384da27fee14f111
subsection
7
65
Surface-mass balance
The mechanisms which control the dynamics of ice sheets involve environmental interactions; hence an accurate description of the ice-sheet surface is essential. To this end, the balance of mass over the environmental interface is separately described here for each component mass, then combined to give a single multi-ph...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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c42fd4bc59972c44d870c047daf7a08bc4d57532
subsection
8
65
Component surface-mass balance
The transport of each solid (\mathrm {s}), liquid (\mathrm {\ell }), and vapor (\mathrm {v}) component masses within can only be governed by advectionThe velocity \underline{u} represents the motion of the component masses., while along the surface of the ice sheet , some fluctuation of each component mass will occur v...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1056, "openalex_id": "", "raw": "R. Greve and H. Blatter, Dynamics of Ice Sheets and Galciers, Springer, 2009.", "source_ref_id": "a0187478864ec428d86fbe4cda6d1e4f6c6d5742", "start": 392 } ] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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9c458dd7ee150bba9fd0c093c4e8462cd81d81e9
subsection
9
65
Component surface-mass balance
Hence relations phasesurfacemassbalanceone,phasesurfacemassbalance evaluated from the ice-sheet (-) perspective with k = \mathrm {s} yields the Dirichlet component of the Navier boundary conditions given by\underline{u}_{\mathrm {s}}^- \cdot \underline{\hat{n}}^- = -\mathring{F}_{\mathrm {s}}^- = - \mathring{q}_{\mathr...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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bd2f50dba38cb34a5a35626cde87adadba114e2d
subsection
10
65
Mixture surface-mass balance
Using barycentric velocity \underline{u}^{\pm } from relation barycentricvelocity, the total mass jump over the surface is given by the sum of each component jump of componentmassjump:\left.{ \rho \left( \underline{u} - \underline{w} \right) } \right. = 0 && \text{on } ,where thmhomogeneoustotalmassreaction has been us...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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a6bf339b0bd07b3170627e8b1383ec52a02057a9
subsection
11
65
Mixture surface-mass balance
These processes include phase transitions, densification of snow on the upper surface, basal-water flux due to internal-viscous heating, interaction with the basal-hydraulic system, accumulation of ice under a floating ice shelf due to super-cooled water that has frozen due to rising convection currents, etc.If the ext...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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cb8a355452daf9a36d3f515295f341d78763d19b
subsection
12
65
Ice-sheet surface-mass balance
Setting (\pm ) = (-) \iff (\mp ) = (+), removing all (-) superscripts from the ice variables, and collapsing the exterior (+) domain to the ice-sheet surface \rightarrow , relation surfaceflux is identical to the expressionSurface-mass balance relation surfacemassbalance is identical to Equations (5.19) and (5.29) of w...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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a0d802b624183529cd7bba4004886539ccfcd918
subsection
13
65
Global/local mass conservation
Consider the ice-sheet domain (\underline{x},t) \in \mathbb {R}^3 with boundary = \partial (\underline{x},t) and outward-pointing-unit normal \underline{\hat{n}}. Substitution of mass density \phi = \rho in Reynolds transport theorem (cf. thmreynoldstransport) yields\frac{\mathrm {d}^{} }{\mathrm {d} t^{} } \int _{} \r...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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ed948bf7b46f983cc1b83a4bbbf681dbf990f056
subsection
14
65
Local incompressibility
Consider within an arbitrarily fixed ice-sheet material element ^{\mathrm {e}}(\underline{x}) \subset with boundary \partial ^{\mathrm {e}} = ^{\mathrm {e}}. The constant volume of ^{\mathrm {e}} demands that density fluctuations caused by melting or freezing—induced by changes in pressure and heat flux—present a mass ...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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ca6951665637eb857d7b0d0263ff457ca52da457
subsection
15
65
Local incompressibility
Therefore, provided that mass transport is conserved such that \dot{m} = 0, relation mixturemassbalance is reduced toRelation incompressibleconservationofmass is identical to Equations (2.11)_1 of and (3.60) of with \rho _v \equiv 0.\nabla \cdot \underline{u} &= 0 &&\text{ in } ;the well-known incompressibility constra...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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d496b8200dba3850a6fedf8402addfaf194dd3b6
subsection
16
65
Free-surface equation
The results of this section are identical to that of . For reasons stated in the introduction, and for clarity of the analysis to follow, the fundamental free-surface relations are revisited. To this end, assume that the surface of the ice-sheet body can be stated in implicit form in the sense of thmimplicitsurface. Th...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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076ad9f945dfee987f1f18d63e0e47d0b09c4177
subsection
17
65
Free-surface equation
It is common practice to first solve for \underline{u} at time t from momentum conservation, then solve intermediatekinematicsurface for an updated surface F(\underline{x}, t + \Delta t) some interval of time \Delta t from t.Decomposition of the surface into = _{\mathrm {S}} \cup _{\mathrm {B}} with _{\mathrm {S}} \cap...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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485634cec643c7ca269ff3411a3cb6910b8e97d1
subsection
18
65
Free-surface equation
Therefore, for an inclined surface, \Delta S = \mathring{S}\Delta t ( \hat{\underline{k}} \cdot \underline{\hat{n}})^{-1} = \mathring{S}\Delta t \Vert \hat{\underline{k}} - \nabla S \Vert , which after division by \Delta t and taking the limit as \Delta t \rightarrow 0 produces the instantaneous rate of change \partial...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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ef9f6923015c3d0b9a4eb81dcb4bf4e3ee8f05fd
subsection
19
65
Mass balance in
Similar to secfreesurface, the results of this section are identical to that of . For reasons stated in the introduction, and for clarity of the analysis to follow, the fundamental ice-thickness relation is revisited.The ice-sheet domain of analysis is reduced from \in \mathbb {R}^3 to \in \mathbb {R}^2 by vertical int...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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bd196d4c57bbf6fb486f0fab889a057341b02368
subsection
20
65
Mass balance in
Integrating volume-conservation relation incompressibleconservationofmass vertically produces\int _B^S \nabla \cdot \underline{u} \ \mathrm {d}z = & \int _B^S \left( \frac{\partial ^{} u_x}{\partial x^{} } + \frac{\partial ^{} u_y}{\partial y^{} } + \frac{\partial ^{} u_z}{\partial z^{} } \right) \ \mathrm {d}z = 0.The...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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caf45b4e099554337f69173319b22a091c450a91
subsection
21
65
Mass balance in
In addition, the surface-normal-vector magnitudes (cf. defnormalvector)\Vert \nabla F_{\mathrm {S}} \Vert = \Vert \hat{\underline{k}} - \nabla S \Vert \ge 1 \hspace{22.76219pt} \text{and} \hspace{22.76219pt} \Vert \nabla F_{\mathrm {B}} \Vert = \Vert \nabla B - \hat{\underline{k}} \Vert \ge 1multiplicatively attached t...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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b11d0db9bea2b0dc8ff7b3c3deeee151361426e9
subsection
22
65
Error analysis
If the upper and lower surfaces are relatively flat, it has been previously assumed that (cf. rmknormalkinematicforcing, rmksmbcoefficients, and rmkmisconception)\Vert \hat{\underline{k}} - \nabla S \Vert \equiv 1, \hspace{28.45274pt} \Vert \nabla B - \hat{\underline{k}} \Vert \equiv 1.Assumption commonassumptions_1 is...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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08c1c17c119a496b5e1e9fc178e2945a668b4f13
subsection
23
65
Error analysis
However, the flanks of Jakobshavn's trench possess a abnormally high surface-gradient magnitude (figjakobgradb); coupled with the fact that this area is characterized by very high magnitudes of basal velocity and basal-mass balance \mathring{B}, assumptions commonassumptions will induce a significant error in the forci...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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44e9722e26b527fd82c675773925c8d1b9eab3fb
subsection
24
65
Error analysis
In addition, the ice sheet flow will increase in magnitude as the surface gradient magnitude increases (cf. , ); therefore, the imposition of assumptions commonassumptions will generate a non-physical augmentation of velocity that is of greatest magnitude near regions of high surface slope. [Figure: Unitless surface-gr...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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4591006ea824b56ca7bbf0e6aa5f66f3047e6c2e
subsection
25
65
Analytic solution
An analytic solution satisfying incompressibility relation incompressibleconservationofmass and free-surface equations upperfreesurface,lowerfreesurface provides the ability to verify and thereby guarantee the correct implementation of any numerical model associated with ice-sheet mass conservation. The verification of...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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eea65ab2a9afed3a455732698739a6ac97a530e4
subsection
26
65
Analytic solution
That is, the linearly-interpolated analytic vertical component of velocity is given byu_z^{\mathrm {a}}(\underline{x},t) = \xi _{\mathrm {S}} u_{z \mathrm {S}}^{\mathrm {a}} + \xi _{\mathrm {B}} u_{z \mathrm {B}}^{\mathrm {a}},where\xi _{\mathrm {B}}(\underline{x},t) = \frac{S(x,y,t) - z}{H(x,y,t)}, \hspace{28.45274pt}...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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4db8333274713f1c3d561c76040792fefa7b733a
subsection
27
65
Analytic solution
Thus u_z^{\mathrm {a}} defined by analyticzvelocity is fully determined once S, B, u_x^{\mathrm {a}} and u_y^{\mathrm {a}} have been specified.For simplicity, the x component of velocity is chosen to beu_x^{\mathrm {a}}(\underline{x},t) &= \left( u_{x \mathrm {S}}^{\mathrm {a}} - u_{x \mathrm {B}}^{\mathrm {a}} \right)...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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3944c6ad6b7039b334c1c1d8c817798aaa33beeb
subsection
28
65
Analytic solution
Hence this parameter may be used to verify the numerical implementation of the Dirichlet boundary condition \mathring{B}= - \underline{u} \cdot \underline{\hat{n}} over basal surfaces (cf. rmkimpenetrablesurfaceremark).The final y component of velocity u_y^{\mathrm {a}} must satisfy incompressibility relation incompres...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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d6730c7be94dd7b9d189acbc3308b23010eb60eb
subsection
29
65
Analytic solution
In addition, as the coefficients A, G, and C do not depend on u_y^{\mathrm {a}}, equation analyticyvelocityproblem is linear; the authors of and incorrectly describe their analogous relations as quasi linear. Regardless of the classification of the partial-differential equation, the appropriate method used to solve hyp...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.0263077300041914, 0.010651273652911186, -0.034486930817365646, 0.01413811556994915, 0.004432944115251303, -0.010162962600588799, -0.003381931921467185, 0.003042403608560562, 0.014695094898343086, 0.00946101639419794, -0.025697341188788414, -0.010796240530908108, 0.007797708734869957, 0....
3a92f8a3638e1739fa0867eca0faea7509b35e4a
subsection
30
65
Analytic solution
In this case, application of the chain rule (cf. thmonevariablechainrule) produces\frac{\mathrm {d}^{} u_y^{\mathrm {a}}}{\mathrm {d} s^{} } = \frac{\partial ^{} u_y^{\mathrm {a}}}{\partial y^{} } \frac{\mathrm {d}^{} y}{\mathrm {d} s^{} } + \frac{\partial ^{} u_y^{\mathrm {a}}}{\partial z^{} } \frac{\mathrm {d}^{} z}{...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.011550910770893097, 0.028106708079576492, -0.04040529951453209, 0.0010690696071833372, 0.012107857502996922, -0.008636480197310448, -0.028747577220201492, 0.03027345798909664, 0.024795548990368843, 0.028259295970201492, -0.029129046946763992, 0.0055580176413059235, 0.007160191424190998, ...
89cba9144dde129f6364688a8c9f54155a9e9fd8
subsection
31
65
Analytic solution
This function may be arbitrarily specified in terms of the coordinates \phi _1 and \phi _2; for simplicity, let \vartheta (\phi _1, \phi _2) \equiv \lbrace \phi _1(y,z) = 0,\ \phi _2(y,z) = 0\rbrace \iff z_0 = 0,\ u_{y0} = 0. In this case, solving constant1 with u_{y0} = 0 for u_y^{\mathrm {a}} producesu_y^{\mathrm {a}...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.02806895226240158, 0.034281060099601746, -0.033823162317276, 0.02316947840154171, 0.0033693427685648203, -0.03103000484406948, -0.0015425331657752395, 0.007036317139863968, 0.03641790151596069, 0.012805791571736336, -0.019002635031938553, 0.004124869126826525, 0.037761058658361435, 0.01...
0f679d98998fdbb0d6d332acdd1722b00b06b768
subsection
32
65
Analytic solution
The fourth and fifth integrals of analyticyvelocity given by\mathcal {I}_{\mathrm {S}} = \frac{1}{H} \int _y \Vert \hat{\underline{k}} - \nabla S \Vert \mathring{S}\ \mathrm {d}y \hspace{28.45274pt} \text{and} \hspace{28.45274pt} \mathcal {I}_{\mathrm {B}} = \frac{1}{H} \int _y \Vert \nabla B - \hat{\underline{k}} \Ver...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ 0.01438200380653143, 0.042940009385347366, -0.01029247883707285, 0.060091596096754074, 0.011681086383759975, 0.008163790218532085, 0.021515782922506332, -0.007965417578816414, 0.029038676992058754, 0.019196350127458572, -0.020081397145986557, 0.006035100668668747, 0.0587182492017746, 0.023...
da5e3f49081504932ee7dada46789008d345eff6
subsection
33
65
Example calculation
A specific realization of the solution derived in secr3analyticsolution is hereby generated (figr3) over the ice-sheet domain = [0,\ell ] \times [0,\ell ] \times [B,S] \subset \mathbb {R}^3 with upper and lower surfacesThese surfaces were chosen independent from y as suggested by rmkellipticintegral.S(x) = \frac{1}{10}...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.02520694024860859, 0.03369063138961792, -0.019317181780934334, 0.0017795152962207794, 0.036406632512807846, 0.009506006725132465, 0.008781231008470058, 0.003492275020107627, 0.03472820669412613, 0.009155062958598137, -0.009628074243664742, 0.06020979583263397, -0.01673850603401661, 0.03...
1f63b5c6be04b481a09a4d0f491dfb53499e4f98
subsection
34
65
Example calculation
Finally, the upper and lower surface-mass balance terms were respectively chosen to be (figr3smb,figr3bmb)\mathring{S}= \sin \left( \frac{4 \pi }{\ell } x \right) \sin \left( \frac{4 \pi }{\ell } x \right) \hspace{22.76219pt} \text{and} \hspace{22.76219pt} \mathring{B}= \sin \left( \frac{2 \pi }{\ell } x \right) \sin \...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.7717/peerj-cs.103", "end": 602, "openalex_id": "https://openalex.org/W2417863416", "raw": "A. Meurer, C. P. Smith, M. Paprocki, O. Čertík, S. B. Kirpichev, M. Rocklin, A. Kumar, S. Ivanov, J. K. Moore, S. Singh, T. Rathnayake, S. Vig, B....
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.040196433663368225, 0.029361402615904808, -0.02098333090543747, 0.017976991832256317, 0.023379245772957802, 0.018175380304455757, 0.028873063623905182, -0.000023427412088494748, 0.019899828359484673, 0.03543512523174286, 0.00006909000512678176, 0.01852637343108654, 0.03854828700423241, ...
b8200f0f09a9b491ea3c2a8500c2946e5c7a9967
subsection
35
65
Future work
The concepts of mass balance derived here provide the basis of a new formulation for energy and momentum conservation for ice sheets. Once formulated, these concepts will be used to describe conservation laws near the interface of ice and ocean.
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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bfbfdebf987105a96e20067c54e10e1ec9bcfbe8
subsection
36
65
Mathematical background
[Figure: NO_CAPTION]Behavior of the Taylor coefficients as h decreases. It is common to refer to the truncated Taylor series which does not include the h^n terms as the \mathrm {n}th-order-Taylor-series approximation which is clearly only accurate for h \ll 1.This section introduces the relevant mathematical background...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.054659511893987656, 0.008667392656207085, -0.03183130547404289, 0.024277856573462486, -0.0002792010782286525, -0.02253827452659607, -0.0033799780067056417, 0.05127190425992012, -0.0312819629907608, 0.02307235635817051, -0.009705038741230965, -0.02305709756910801, -0.051577091217041016, ...
4b15917b08fa8db14bed2aed283fa8652dd44fd9
subsection
37
65
Mathematical background
The basis from which we begin is the following fundamental theorem presented by :[Taylor's theorem] Any real-valued function f(x) \in \mathbb {R} with x \in \mathbb {R} that is infinitely differentiable about a point x+h with distance h>0 may be expressed as the infinite Taylor seriesf(x+h) &= f(x) + f^{\prime }(x) h ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 699, "openalex_id": "", "raw": "B. Taylor, Methodus incrementorum directa & inversa, Typis Pearsonianis : Prostant apud Gul. Innys, 1715, https://books.google.de/books?id=Kb46vgAACAAJ.", "source_ref_id": "8a8d51c749504f55012...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.026756448671221733, -0.01961732842028141, -0.020166492089629173, 0.011471408419311047, 0.02308010682463646, -0.005274254363030195, 0.005613667890429497, 0.02587168663740158, 0.023659778758883476, -0.0017924074782058597, -0.02282078005373478, 0.015437586233019829, -0.04536697641015053, 0...
69819e4a58da372e0f50115ddcfb124908bff9b2
subsection
38
65
Mathematical background
Similar to the line of reasoning resulting in defderivative, taking the limit of small \Vert \underline{h} \Vert suggests the following definition:[Gradient] The gradient of a real-valued function f(\underline{x}) \in \mathbb {R} with respect to its vector of coordinates \underline{x} = [x_1\ x_2\ \cdots \ x_n]\mathbb...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf02478259", "end": 1164, "openalex_id": "https://openalex.org/W1995341919", "raw": "R. Larson and B. H. Edwards, Calculus, Richard Stratton, Belmont, CA 94002, USA, 9th ed., 2010.", "source_ref_id": "87abb25789c2dab60cdd4915e...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.03845932334661484, -0.0023235841654241085, -0.02844768948853016, -0.016467304900288582, 0.0025105392560362816, 0.01336919330060482, 0.0017293341225013137, 0.018023991957306862, 0.013552333228290081, -0.008172606118023396, -0.02232777327299118, 0.006402256432920694, -0.04035176709294319, ...
0e790dc729c20f16950e7b820f624b8b96ccc4b3
subsection
39
65
Mathematical background
Then the derivative of f with respect to t is\frac{\partial ^{} f}{\partial t^{} } = \frac{\partial ^{} f}{\partial x_1^{} }\frac{\partial ^{} x_1}{\partial t^{} } + \frac{\partial ^{} f}{\partial x_2^{} }\frac{\partial ^{} x_2}{\partial t^{} } + \cdots + \frac{\partial ^{} f}{\partial x_n^{} }\frac{\partial ^{} x_n}{\...
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1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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e4fb83030e185b426760d2031915a5dae5c49dc7
subsection
40
65
Mathematical background
Using the fact that the value of \underline{h} = \underline{h}(\underline{x}, t) will be identical at each instant t, the derivative of the function F with respect to t is given simply byThe overhead-dot notation (\ \dot{ }\ ) was first used by to specifically denote differentiation with respect to time. Other rates of...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 306, "openalex_id": "", "raw": "I. Newton, Tractatus de quadratura curvarum, s.l.s.n., 1704, http://dx.doi.org/10.3931/e-rara-4844.", "source_ref_id": "344d8dafb149f8b9a7311319fe1b41f9a64cdb83", "start": 0 } ] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.02200216054916382, -0.020400062203407288, -0.0237568411976099, 0.02422984130680561, 0.001524855033494532, -0.04067806154489517, -0.019667673856019974, 0.036100633442401886, 0.02735774964094162, -0.012305647134780884, -0.008750513195991516, -0.003982360474765301, -0.02203267812728882, -0...
fb1569a5b70d490ef3d195a77f23f00dd7e3be0b
subsection
41
65
Mathematical background
Finally, the literature commonly refers to the second term u f as the \emph {advective} component due to the fact that it is responsible for the transport of the quantity f at speed u.\footnote {The process of advection can be better understood by consideration of fundamental-conservation equation {def_fundamental_cons...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf02478259", "end": 703, "openalex_id": "https://openalex.org/W1995341919", "raw": "R. Larson and B. H. Edwards, Calculus, Richard Stratton, Belmont, CA 94002, USA, 9th ed., 2010.", "source_ref_id": "87abb25789c2dab60cdd4915e6...
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.015747549012303352, 0.005149997770786285, -0.012543105520308018, 0.0032330541871488094, 0.020538954064249992, -0.02795495092868805, -0.023407693952322006, 0.004921108949929476, 0.02320932410657406, 0.0396435372531414, 0.0058519234880805016, 0.01742606610059738, -0.035462502390146255, 0....
8507b7260e22401bebf2e5913881700938376a03
subsection
42
65
Mathematical background
Then F(\underline{s}(t)) = 0 for all t and application of the chain rule (cf. thmonevariablechainrule) yields\frac{\mathrm {d}^{} F}{\mathrm {d} t^{} } = &\frac{\partial ^{} F}{\partial x^{} } \frac{\mathrm {d}^{} x}{\mathrm {d} t^{} } + \frac{\partial ^{} F}{\partial y^{} } \frac{\mathrm {d}^{} y}{\mathrm {d} t^{} } +...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.009781710803508759, 0.047641970217227936, -0.0228595994412899, -0.008431194350123405, 0.02029590681195259, -0.012787946499884129, -0.02923831343650818, -0.028246408328413963, 0.008988186717033386, 0.012749796733260155, -0.022478098049759865, 0.03268709033727646, -0.00651223910972476, 0....
2ba40bad376c3e322c26c2fb8258e62172eb9664
subsection
43
65
Mathematical background
The outward-pointing unit-normal vectors over these surfaces are respectively\underline{\hat{n}}_{\mathrm {S}} = \frac{ \nabla F_{\mathrm {S}} }{\Vert \nabla F_{\mathrm {S}} \Vert } \hspace{28.45274pt} \text{and} \hspace{28.45274pt} \underline{\hat{n}}_{\mathrm {B}} = \frac{ \nabla F_{\mathrm {B}} }{\Vert \nabla F_{\ma...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
[ -0.06026165559887886, 0.015942640602588654, -0.0193447545170784, -0.004794234409928322, 0.009016363881528378, -0.010389414615929127, -0.03801824152469635, -0.010725049301981926, 0.03170220926403999, 0.03328884392976761, -0.045005541294813156, 0.04323583096265793, 0.007978948764503002, 0.03...
1be52830ae56060e2266da20baa15d4520041055
subsection
44
65
Mathematical background
Hence the area of A_i is given by\Vert \underline{u}_i \times \underline{v}_i \Vert = \left(1 + \left( \frac{\partial ^{} S_i}{\partial x^{} } \right)^2 + \left( \frac{\partial ^{} S_i}{\partial y^{} } \right)^2 \right)^{\frac{1}{2}} \Delta x_i \Delta y_i.Using the normal-vector magnitude of defnormalvector, summing ov...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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63118a0c6ddbf8d907b290662131cdc7b7abe64d
subsection
45
65
Mathematical background
That is,\frac{\partial ^{} \mathcal {I}}{\partial x^{} } &= \lim _{\Delta x \rightarrow 0} \frac{1}{\Delta x} \left( \int _{a(x)}^{b(x)} f(x + \Delta x,y) \ \mathrm {d}y - \int _{a(x)}^{b(x)} f(x,y) \ \mathrm {d}y \right) \\ &= \lim _{\Delta x \rightarrow 0} \int _{a(x)}^{b(x)} \left( \frac{f(x + \Delta x,y) - f(x,y)}{...
{ "cite_spans": [] }
1805.11175
On mass conservation for ice sheets
[ "Evan M. Cummings" ]
[ "physics.flu-dyn" ]
2,018
en
Physics
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