arxiv_id stringlengths 0 16 | text stringlengths 10 1.65M |
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# Recognizability of machines which halt in $n$ steps on some input
We define the following language:
$$L = \{M \mid \text{M is a TM and there exists an input x on which M halts in at most |x| steps}\}.$$
Following this question I understand that $L$ is not decidable, but I know that it is recognizable, and therefor... | |
## Class/Course - Engineering Entrance
### Subject - Physics
#### Total Number of Question/s - 3094
Just Exam provide question bank for Engineering Entrance standard. Currently number of question's are 3094. We provide this data in all format (word, excel, pdf, sql, latex form with images) to institutes for conducti... | |
<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
# Multi-Step Problems with Changes of State
## Explains the calculation process when multiple changes of state are involved
Estimated7 minsto complete
%
Progress
Practice Multi-Step Pro... | |
This meetup included an extensive Text Mining in R session with an Introduction to tm by Ingo Feinerer and a talk about Text Mining with Hadoop by Stefan Theussl.
After a creative break for the last month Ingo and Stefan gave great talks covering tm in greater detail after the brief introduction in February.
## Ingo ... | |
# Definition:Induced Mapping on Spectra of Rings
## Definition
Let $A$ and $B$ be commutative rings with unity.
Let $f : A \to B$ be a ring homomorphism.
The induced mapping on spectra by $f$ is the mapping $f^* : \operatorname{Spec} B \to \operatorname{Spec} A$ between their spectra with:
$f^* (\mathfrak p) = f^{... | |
# When is the Demand for a Good Said to Be Inelastic? - Economics
When is the demand for a good said to be inelastic?
#### Solution
When the percentage change in demand for a good is less than the percentage change in its price, the demand for a good is inelastic.
Concept: Change in Demand
Is there an error in this... | |
## February 23, 2018
### Higher Algebra and Mathematical Physics
#### Posted by John Baez
You all know about Homotopy Type Theory Electronic Seminar Talks. Here’s another way to cut carbon emissions: a double conference. The idea here is to have a conference in two faraway locations connected by live video stream, t... | |
# VS2010 always thinks project is out of date but nothing has changed
I have a very similar problem as described here.
I also upgraded a mixed solution of C++/CLI and C# projects from VS2008 to VS2010. And now in VS2010 one C++/CLI project always runs out of date. Even if it has been compiled and linked just before a... | |
# Octonions to the Rescue
## Xavier Dahan and Jean-Pierre Tillich’s Octonion-based Ramanujan Graphs with High Girth.
Update (February 2012): Non associative computations can be trickier than we expect. Unfortunately, the paper by Dahan and Tillich turned out to be incorrect.
Update: There is more to be told about th... | |
# [Dev-luatex] Four suggestions
Hans Hagen pragma at wxs.nl
Mon Sep 3 20:57:55 CEST 2007
Javier Múgica de Rivera wrote:
> Yes, I do have red that at this stage suggestions will not really be
> usefull, but the fact that what would be my top suggestion wasn't
> present in the manual from April but already appeared... | |
On some extensions of the FKN theorem
Revised: September 19, 2015
Published: December 29, 2015
$\newcommand{\Var}{{\mathrm {Var}}}$
Let $S=a_{1}r_{1}+a_{2}r_{2}+\ldots+a_{n}r_{n}$ be a weighted Rademacher sum. Friedgut, Kalai, and Naor have shown that if $\Var(|S|)$ is much smaller than $\Var(S)$, then the sum is large... | |
# What is the intuitive relationship between SVD and PCA?
Singular value decomposition (SVD) and principal component analysis (PCA) are two eigenvalue methods used to reduce a high-dimensional data set into fewer dimensions while retaining important information. Online articles say that these methods are 'related' but... | |
This site is supported by donations to The OEIS Foundation.
# Benford's law
Please do not rely on any information it contains.
Given a finite set of numerical data, it would be expected that the digits 1 through 9 would occur as first digits with roughly equal probability. However, in many cases, the digit 1 occurs ... | |
## Shortcuts and document type.
### Shortcuts and document type.
how can i make a shortcut like cmd (or super) + i to grab the selected text and replace it with \textit{selected text} ? and is it possible to do this shortcut work only when the document is defined as a latex document?
thank you.
bgustavo
Posts: 2
Jo... | |
problem
Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a star be an amount of the stars that are not higher and not to the right of the given star. Astronomers want to know the distribution of the levels of the stars. For e... | |
In this video, you will learn how to do a reflection over an axis, such as the x-axis or y-axis.
To reflect a shape over an axis, you can either match the distance of a point to the axis on the other side of using the reflection notation.
To match the distance, you can count the number of units to the axis and plot a... | |
# Well defined probability
Given the following probabilistic model
where $u$ are users of a search engine, $c$ are categories where the queries that $u$ search ($q$) and webs sites that they visit ($w$) are classified.
My question is if the following has necessarily has to hold for $p(c\mid q)$ to be a probability:
... | |
6. Process or Product Monitoring and Control
6.4. Introduction to Time Series Analysis
6.4.3. What is Exponential Smoothing?
## Example of Triple Exponential Smoothing
Example comparing single, double, triple exponential smoothing This example shows comparison of single, double and triple exponential smoothing for a ... | |
In the previous post, we did two examples of proving average-case fine-grained hardness via worst-case to average-case reductions. In this post, I want to continue the discussion of counting $t$-cliques (in particular, on Erdős–Rényi graphs) to showcase a new technique, which builds on the general recipe and the exampl... | |
## Talks
Wednesday, July 14, 16:00 ~ 16:30 UTC-3
## Cyclic quadrilaterals and smooth Jordan curves
### Joshua Greene
#### Boston College, USA - This email address is being protected from spambots. You need JavaScript enabled to view it. document.getElementById('cloak4693e66d0fa4afa82d586a5e6da88e1c').innerHTML ... | |
### Vector Displays The Sketchpad, developed at MIT’s Lincoln Lab,...
Below you can see a picture of a a IBM 709 along with the included ...
The resulting line on the raster screen will be something like this...
The **Newton-Raphson** method is an iterative root-finding algorith...
This iterative method of finding squa... | |
# Find Amplitude, Period, and Phase Shift y=5sin((2x)/3-pi)
Find Amplitude, Period, and Phase Shift y=5sin((2x)/3-pi)
Use the form to find the variables used to find the amplitude, period, phase shift, and vertical shift.
Find the amplitude .
Amplitude:
Find the period using the formula .
The period of the function ca... | |
# Differentiability of $f(x)=\frac{x|y|}{\sqrt{x^2+y^2}}$ in $(0,0)$
Prove that$$\begin{array}\\&f(x)&=\begin{cases}\frac{x|y|}{\sqrt{x^2+y^2}}&\text{ if }(x,y) \ne (0,0)\\0&\text{ otherwise }\end{cases}\end{array}$$ is differentiable in $(0,0)$.
Proof.
We know that f is differentiable in (0,0), if all partial deriv... | |
# Calculate the homology group of $S^3/G$, an Harvard qualifying exam problem with “unclear” solution
Problem Suppose that $G$ is a finite group whose abelianization is trivial. Suppose also that $G$ acts freely on $S^3$. Compute the homology groups (with integer coeffcients) of the orbit space $M=S^3/G$.
This is an ... | |
# Model of MLTT with $\eta$ rule where function extensionality fails
Consider intensional Martin-Löf type theory with judgmental $$\eta$$ rule for dependent product types. Is there a model of it where function extensionality fails?
• Here's a proof in Agda – ice1000 May 17 at 0:31
The simplest one that I know about ... | |
# Tag Info
14
There does not, even if you don’t require the fiber and base to be manifolds (or even connected, just that $F$ is not a single point). See Borel, Armand; Serre, Jean-Pierre, Impossibilité de fibrer un espace euclidien par des fibres compactes, C. R. Acad. Sci. Paris 230 (1950), 2258–2260.
13
I guess t... | |
# Machine Learning Holographic Mapping by Neural Network Renormalization Group
Hong-Ye Hu, Shuo-Hui Li, Lei Wang, Yi-Zhuang You
Jan 07, 2020
0
0
The exact holographic mapping (EHM) provides an explicit duality map between a conformal field theory (CFT) configuration and a massive field propagating on an emergent cla... | |
# Pipeline Design¶
This section presents an overview of the fundamental algorithms used by, and data flow through, the TraP. It is designed such that everyday users have a full understanding of how their data is being processed. Note that the top-level logic is defined in tkp.main, further implementation details for s... | |
### For REFEREES
Successive iterations for unique positive solution of a nonlinear fractional q-integral boundary value problem Guotao Wang,Zhanbing Bai,Lihong Zhang Keywords:Fractional q-difference equation; q-integral condition; Explicit iterative sequence; Hybrid monotone method. Abstract: In this paper, under cer... | |
1
AIPMT 2000
When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be
A
first line of Lyman series
B
second line of Balmer series
C
first line of Balmer series
D
second line of Paschen series.
Explanation
Jump to second orbit leads to Balmer series. The jump from 4th orbit shall give... | |
gemseo / utils
# logging_tools module¶
## Logging tools¶
class gemseo.utils.logging_tools.LoggingContext(logger=<RootLogger root (INFO)>, level=30, handler=None, close=True)[source]
Bases: object
Context manager for selective logging.
Change the level of the logger in a with block.
Examples
>>> logger = logger.... | |
# Chapter 11 Characterization
Chapter leads: Anthony Sena & Daniel Prieto-Alhambra
Observational healthcare databases provide a valuable resource to understand variations in populations based on a host of characteristics. Characterizing populations through the use of descriptive statistics is an important first step ... | |
Determine whether the triangle having sides (a − 1) cm,
Question:
Determine whether the triangle having sides $(a-1) \mathrm{cm}, 2 \sqrt{a} \mathrm{~cm}$ and $(a+1) \mathrm{cm}$ is a right angled triangle.
Solution:
Let
$A=(a-1)$
$B=\sqrt{2} a$
$C=(a+1)$
Larger side is $C=(a+1)$
We know that any number plus 1... | |
## Uses of Interfacecom.opengamma.strata.collect.function.CheckedConsumer
• Packages that use CheckedConsumer
Package Description
com.opengamma.strata.collect
Root package for common data structures used by Strata.
• ### Uses of CheckedConsumer in com.opengamma.strata.collect
Methods in com.opengamma.strata.collect w... | |
×
Get Full Access to Fundamentals Of Statistics - 4 Edition - Chapter 3.2 - Problem 23ayu
Get Full Access to Fundamentals Of Statistics - 4 Edition - Chapter 3.2 - Problem 23ayu
×
# Solved: The Empirical Rule The following data represent
ISBN: 9780321838704 30
## Solution for problem 23AYU Chapter 3.2
Fundamentals... | |
# Why does $\mathrm{cis}\left(2\pi x\right)$ not equal $1$?
\begin{align} \mathrm{cis}\left(\theta\right) &= \cos\left(\theta\right)+i\sin\left(\theta\right) \\ &= e^{i\theta} \end{align}\\$$\text{Let } \theta = 2\pi x \\$$\begin{align} \mathrm{cis}\left(2\pi x\right) &= e^{i\times2\pi x} \\ &= \left(e^{2\pi i}\right)... | |
# The Software
There is a common quote about ships which may help explain why recording weather readings in a computer is not enough:
A ship in port is safe,
But that is not what ships are built for.
In our case, what is the point of collecting information if we don't do something useful with it? Web pages allow us to... | |
## Nagoya Mathematical Journal
### Classification of extremal elliptic {$K3$} surfaces and fundamental groups of open {$K3$} surfaces
#### Abstract
We present a complete list of extremal elliptic $K3$ surfaces (Theorem 1.1). As an application, we give a sufficient condition for the topological fundamental group of c... | |
# 10: Correlation and Regression
Our interest in this chapter is in situations in which we can associate to each element of a population or sample two measurements $$x$$ and y, particularly in the case that it is of interest to use the value of $$x$$ to predict the value of y. For example, the population could be the ... | |
# Plaintext XOR'd with keylength-shifted plaintext
While solving a (easy...) Project Euler cipher problem this week I repeatedly saw instructions for breaking ciphers after identifying the keylength as:
'shift the ciphertext by that key length and XOR it with itself. This removes the key and leaves you with plaintext... | |
The Gurobi™ distribution includes an extensive set of examples that illustrate commonly used features of the Gurobi libraries. Most examples have versions for C, C++, C#, Java, Visual Basic and Python. A few, however, illustrate features that are specific to the Python interface. A brief note for users of the Gurobi MA... | |
# Algebra 1
posted by Lauren
Earth has a radius of about 6.4 x 10 to the 6th power m. Approximate the surface area of earth using the formula for the surface area is a sphere, S = 4 pi r squared. Earths surface is about 70 percent water. About how many square meters of earths surface are covered with water? The ocean... | |
# Is this priority or parity! solution codechef
## Is this priority or parity! solution codechef
NN integers 1,2,3,N1,2,3,…N are placed on a circle in clockwise order such that ii and (i+1)(i+1) are adjacent for all 1iN11≤i≤N−1, and 11 and NN are also adjacent.
Given an integer KK, Ashish repeatedly removes integers... | |
Write the Names and Structures of the Monomers of the Following Polymers: Buna-s - Chemistry
Write the names and structures of the monomers of the following polymers: Buna-S
Write the structures of the monomers used for getting the following polymers:
Buna-S
Solution 1
Polymer Monomer Structure of monomer Buna-S ... | |
# White noise for KdV, mKdV, and cubic NLS on the circle
-
We discuss two methods for establishing the invariance of the white noise for the periodic KdV. First, we briefly go over the basic theory of Gaussian Hilbert spaces and abstract Wiener spaces and show that the Fourier-Lebesgue space $\mathcal{F}L^{s, p}$ capt... | |
# Relativistic weight of a bouncing ball
I was thinking about the mass–energy equivalence, which means that for example a hot gas weighs more than a cold gas and I tried to imagine that microscopically. Lets imagine a gas in a chamber on a weighing scale. If we look at the situation microscopically, we see all the par... | |
# Neutrino production in supernovae
As much as 99% of the gravitational energy liberated in a core collapse supernova emerges as kinetic energy of neutrinos. The neutrinos are produces in nuclear reactions (electron capture on nuclei and free protons) and non-nuclear reactions (e.g. pair annihilation $$\gamma\to\text{... | |
# The apostrophe with Adobe Caslon Pro
I'm writing an article with Adobe Caslon Pro and Xelatex and I found that this mark punctuation ’, an apostrophe, which is ordinary used in French, has not the required interval when used, for instance, in the following words : "L'écriture". This issue is probably similar to this... | |
Magyar Information Contest Journal Articles
# Problem A. 482. (May 2009)
A. 482. Let n be a positive integer. Prove that .
(5 pont)
Deadline expired on June 15, 2009.
Solution. Let .
The sequence is geometric sequence with quotient . In the cases =0 and =2n+1, the quitient is 1 and the last sum equals 2n+1. If 0<... | |
Exact L^2-distance from the limit for QuickSort key comparisons (extended abstract)
Patrick Bindjeme, James Allen Fill
Using a recursive approach, we obtain a simple exact expression for the L^2-distance from the limit in R\'egnier's (1989) classical limit theorem for the number of key comparisons required by QuickSo... | |
# How do you find the vertical, horizontal or slant asymptotes for f(x) = (1/x) + 3?
Jan 2, 2017
Horizontal: $\leftarrow y = 3 \rightarrow$
Vertical : $\uparrow x = 0 \downarrow$
#### Explanation:
graph{x(y-3)(x(y-3)-1)=0x^2 [-20, 20, -10, 10]} $y = f \left(x\right) = \frac{1}{x} - 3$,
$x \left(y - 3\right) = 1$ .... | |
Courses
Infinitesimal Calculus 1(!)Pdf 201.1.0011
6.0 Credits
1. Real numbers (axiomatic theory). Supremum and Infimum of a set. Existence of an n-th root for any a > 0. 2. Convergent sequences, subsequences, Cauchy sequences. The Bolzano-Weierstrass theorem. Upper and lower limits. 3. Series. Partial sums, converge... | |
## Generalized Rao Bound for Nets
Martin and Stinson [1, Theorem 4.1] show that for an even k ≥ 2 an (mk, m, s)-net in base b can only exist if
bmVb(s,∞)(k/2),
where Vb(s,∞)(r) denotes the volume of a ball with radius r in the NRT-space Sb(s,∞).
The result is obtained by generalizing the Rao Bound for orthogonal ar... | |
Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
Already signed up? New to KöMaL?
# Problem K. 279. (January 2011)
K. 279. Ann, Belle, Carol and Dora played with a deck of 52 cards. In one game, Dora was dealing out the cards one by one to the players, starting with Ann, followed b... | |
# what is integral part of a number
The maximum integral part is 999, so let me give … Summations and integrals can be put on the same foundations using the theory of Lebesgue integrals or time scale calculus. {\displaystyle R=[a,b]\times [c,d]} The most basic technique for computing definite integrals of one real var... | |
Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles an... | |
## A community for students. Sign up today!
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## AvAuya 2 years ago how do you convert angles from degrees to radians?
• This Question is Open
1. getusel
multiply by $\frac{ \pi }{ 180^{0} }$
2. AvAuya
thankyou very much
#### Ask your own question
Ask a Question
Find more expla... | |
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##### Conference on "Mathematical properties of large quantum systems"Organizers: Maria J. Esteban (CNRS), Mathieu Lewin (CNRS), Robert Seiringer (McGill, Montréal) & Jan Philip Solovej (Copenhagen)
Jun Yin (Madison, USA): "Local law, Delocalization and Diffusion P... | |
# Combination deworming (mass drug administration targeting both schistosomiasis and soil-transmitted helminths) - 2012 report
We have published a more recent review of this intervention. See our most recent report on combination deworming.
Published: December 2012
# In a nutshell
This page discusses the general ca... | |
# Why are there infinitely many connections on a Riemannian manifold?
I've just started learning some Riemannian manifold stuff, and I'm getting confused about the concept of connection. A connection $\nabla: \Gamma(T\mathcal{M})\times \Gamma(T\mathcal{M}) \rightarrow \Gamma(T\mathcal{M})$ basically defines rules of d... | |
+0
# calculus help
0
133
10
https://prnt.sc/pfqre3
thank you very much any help is appreciated
Oct 7, 2019
edited by Melody Oct 7, 2019
#1
+2417
0
Sorry blocked on my browser
Oct 7, 2019
#2
+2417
+2
Thanks melody!
CalculatorUser Oct 7, 2019
#3
+2417
+3
This is basically what the question is asking
Lets sa... | |
filtration F
I would like to write a super curly F as in measure space(omega, F).
How can I do that?
The styles I can find in the dropdown box such as sans self etc. are not what I am looking for.
Lars
You can easily use
You can easily use \mathcal{F} in order to generate a stylized F for the filtration!
Good lu... | |
金融代写|利率建模代写Interest Rate Modeling代考|MATH4513
Vasicek利率模型一词是指一种对利率的运动和演变进行建模的数学方法。它是一种基于市场风险的单因素短利率模型。瓦西克利率模型常用于经济学中，以确定利率在未来的移动方向。
statistics-lab™ 为您的留学生涯保驾护航 在代写利率建模Interest Rate Modeling方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写利率建模Interest Rate Modeling代写方面经验极为丰富，各种代写利率建模Interest Rate Modeling相关的作业也就用不着说。... | |
# Max/min with constraints
## Homework Statement
Find max/min of x^2+y^2+z^2 given x^4+y^4+z^4=3
## Homework Equations
Use of gradient vectors related by LaGrange Multiplier
## The Attempt at a Solution
$$\begin{gathered} f\left( {x,y,z} \right) = {x^2} + {y^2} + {z^2};g\left( {x,y,z} \right) = {x^4} + {y^4} + {z... | |
# Predicting with random effects in mgcv gam
I am interested in modeling total fish catch using gam in mgcv to model simple random effects for individual vessels (that make repeated trips over time in the fishery). I have 98 subjects, so I thought I would use gam instead of gamm to model the random effects. My model i... | |
Verified Algorithms for Solving Markov Decision Processes
Title: Verified Algorithms for Solving Markov Decision Processes Authors: Maximilian Schäffeler (schaeffm /at/ in /dot/ tum /dot/ de) and Mohammad Abdulaziz Submission date: 2021-12-16 Abstract: We present a formalization of algorithms for solving Markov Decis... | |
Change symbol used for anti-windup gain
Issue #56 resolved
Richard Murray repo owner created an issue
On 14 Nov 2018, at 6:53 , Karl Johan Astrom karl_johan.astrom@control.lth.se wrote:
Richard,
Have made a slight modification of stability of anti-windup schemes and example, one small thing I would have a slight pr... | |
# Math Insight
### Applet: Doubling time and half life
If a population size $P_T$ as a function of time $T$ can be described as an exponential function, such as $P_T=0.168 \cdot 1.1^T$, then there is a characteristic time for the population size to double or shrink in half, depending on whether the population is grow... | |
Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles an... | |
# Replicating computation to avoid communication
Version's name: Replicating computation to avoid communication ; a version of the Communication computation trade-off program.
Repository: [home] and version downloads: [.zip] [.tar.gz] [.tar.bz2] [.tar]
Implemented best practices: Replicating computation to avoid commu... | |
# Row Echelon Form and Reduced Row Echelon Form in finding the rank of a matrix (2).
To find the rank of the matrix why it is enough to find the row echelon form only? why the REF gives us the maximum number of linearly independent row vectors in the matrix? could anyone explain this for me please?
I understood from ... | |
# Derivation Compton Scattering
Level 3 (up to Physics B.Sc.)
Level 3 requires the basics of vector calculus, differential and integral calculus. Suitable for undergraduates and high school students.
Updated by Alexander Fufaev on
In Compton scattering, photons of a certain wavelength $$\lambda$$ are scattered by an ... | |
## Tokyo Journal of Mathematics
### $L^p$ Estimates for Some Schrödinger Type Operators and a Calderóon-Zygmund Operator of Schrödinger Type
Satoko SUGANO
#### Abstract
We consider the Schrödinger and Schrödinger type operators $H_{1}=-\Delta+V$ and $H_2=(-\Delta)^2+V^2$ with non-negative potentials $V$ on $\mathbf... | |
PigeonholePrinciple ColoringMethod IMO Intermediate
1964
Problem - 2749
Seventeen people correspond by mail with one another - each one with all the rest. In their letters only three different topics are discussed. Each pair of correspondents deals with only one of these topics. Prove that there are at least three peo... | |
# The Root is Constantly Changing
A negative sign is not a Peanuts character!
-264.66409225
-462.71021449
-20.60615236
-21.38877504
-92.13888121
-213.77948944
-58.14977536
-276.29420841
-242.07314569
-276.16789489
-373.92343641
Answer is a semi-thematic four word phrase.
Hint 1
What operation(s) do you have to app... | |
# Percentage Questions
FACTS AND FORMULAE FOR PERCENTAGE QUESTIONS
I.Concept of Percentage : By a certain percent , we mean that many hundredths. Thus x percent means x hundredths, written as x%.
To express x% as a fraction : We have , x% = x/100.
Thus, 20% = 20/100 = 1/5;
48% = 48/100 = 12/25, etc.
To expre... | |
HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Abstract : The precise complexity of complementing \buchi\ automata is an intriguing and long standing problem. While optimal complementation techniques for finite automata are simple -- it suffices to determi... | |
# Large Feedback Arc Sets, High Minimum Degree Subgraphs, and Long Cycles in Eulerian Digraphs
@article{Huang2013LargeFA,
title={Large Feedback Arc Sets, High Minimum Degree Subgraphs, and Long Cycles in Eulerian Digraphs},
author={Hao-wei Huang and Jie Ma and Asaf Shapira and Benny Sudakov and Raphael Yuster},
journa... | |
In the formula, which symbol specifies the fixed columns or rows?
We will be happy to hear your thoughts | |
448 views
The present ages of three persons in proportions $4 : 7 : 9$. Eight years ago, the sum of their ages was $56$. Find their present ages (in years).
1. $8, 20, 28$
2. $16, 28, 36$
3. $20, 35, 45$
4. None of the above options
$\textrm{Assume there age ratio is x}$
$\textrm{then age of 3 person is$4x$,$7x$,$9... | |
# Simulation and Bayes Rule
## Bayesian Statistics Using Sampling Methods¶
This workbook adds more detail on the theoretical underpinnings of Metropolis Hastings MCMC and slightly tweaks and expounds on some examples from Thomas Wiecki's excellent blogpost on this topic. Of course, all errors are mine.
In order to u... | |
stats...............................................
if the variance of a distribution is 16, the mean is 12, and the number of cases is 24, the standard deviation is? | |
Sunday, April 12, 2020
More testing: From concept to implementation
by Ajay Shah.
There are concerns about quantity and quality in Indian Covid-19 data. In terms of the quantity of testing, India is at 120 tests per million of population, which is among the lowest in the world. Countries like Germany, Italy, South K... | |
## Tired..
Not great sleep last night..but I did get things done this morning and was reasonably productive with respect to classes.
Yesterday: achy from 1.6-1.7 on but I finished 2 miles in just under 30 minutes; it was wet. Bleah.
Today:
pull ups went great (10 singles, 3 sets of 10, 2 sets of 5)
Usual hip hikes... | |
# zbMATH — the first resource for mathematics
Interpolation and approximation by piecewise quadratic $$C^1$$-functions of two variables. (English) Zbl 0424.41020
Multivariate approximation theory, Proc. Conf. math. Res. Inst., Oberwolfach 1979, ISNM Vol. 51, 146-161 (1979).
##### MSC:
41A30 Approximation by other sp... | |
How to tell if a BJT is PNP or NPN by looking at the circuit? [closed]
Is it possible to tell if a BJT circuit is PNP or NPN simply by looking at the circuit?
For example, for the circuits shown, how can we tell if they're PNP or NPN?
closed as off-topic by Andy aka, Eugene Sh., Oldfart, Edgar Brown, Nick Alexeev♦Fe... | |
# How can I formally justify the description of an electronic excitation that includes only the relevant orbitals?
I am writing a small program to animate electronic transitions.
To do this, I am animating a Rabi cycle for a single electron as it moves from an occupied into a virtual orbital.
The on-resonance excita... | |
3 added 90 characters in body
Well, let me say what I know so far.
For monic quadratic polynomials it's necessary and sufficient that both roots be real and one be positive with absolute value at least the other. This requires no complicated argument: the characteristic polynomial of [a b] [c d] is x^2 - (a + d)x + (... | |
# All Questions
0answers
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### How to solve two non-linear equation simultaneously? [closed]
I want to solve two non-linear equation at same time with some condition, the complete description of the problem is attached, any comments? Thanks
0answers
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### Academic citations network [closed]
Do you kn... | |
1. Oct 30, 2014
### Bashyboy
Here is a link to a proof which I am trying to understand.
http://groupprops.subwiki.org/wiki/Left_cosets_partition_a_group
The claim I am referring to is number 4, which is
Any two left cosets of a subgroup either do not intersect, or are equal.
Assuming that I am skeptical, then for... | |
# Tag Info
19
Let me first list all of the possibilities I considered that I later rejected. This is far from exhaustive, and I'm looking forward to seeing other people's creativity. Bad Ideas Sit on a tire swing with the fan pointing to the side. Point the fan up, measure speed of rotation of the system on the tire ... | |
Lung cancer claims more lives than any other cancer in the world and remains difficult to diagnose in the early stages. This article examines the current state of lung cancer detection and screening via low-dose computed tomography (LDCT) in Alaska and considers potential opportunities for occupational therapy practiti... | |
How do you integrate int e^xsinx by integration by parts method?
Oct 17, 2016
$\int {e}^{x} \sin x \mathrm{dx} = \frac{1}{2} {e}^{x} \left(\sin \left(x\right) - \cos \left(x\right)\right) + C$
Explanation:
Integration by parts can be expressed:
$\int u \left(x\right) v ' \left(x\right) \mathrm{dx} = u \left(x\righ... | |
# Constrained Optimization of a function of two variables.
I was given the following tutorial problem, and I'm having a bit of trouble seeing how it works.
I've been asked to find the four critical points of this system, with two of these being degenerate points, one being a maximum, and one being a minimum;
$$f(x_1... | |
# Time series forecast by Principal Component Analysis
Suppose that I have a series of $M$ time-observations of $N$ "quantities" $z_1(t_1),...,z_1(t_M)$, ..., $z_N(t_1),...,z_N(t_M)$. I want to estimate the values of $z_1(t_{M+1}),...,z_N(t_{M+1})$. This a problem of interest, for example, in stock asset prediction. I... | |
In the biography of S. Ramanujan “The Man Who Knew Infinity: A Life of the Genius Ramanujan” (excellent, by the way), the author Robert Kanigel describes how Ramanujan’s first published work was a little problem he posed for other mathematicians. In it, Ramanujan asks for the value this series takes:
$\sqrt{1 + 2\sqrt... | |
## Physics & Astronomy Faculty Publications
#### Title
Contribution of Dark Matter Annihilation to Gamma-Ray Burst Afterglows near Massive Galaxy Centers
Article
11-18-2020
#### Publication Title
Astrophysical Journal
904
1
1
6
#### Abstract
Gamma-ray bursts (GRBs) are believed to be powered by ultrarelativ... | |
PROGRAMS
export
Date Published: January 3, 2014 Last Modified: January 3, 2014
The export command is used to make available variables and associated values for other programs called after the export command. When this happens the variable is called an environment variable.
Create New
For example, to make availabl... | |
# Construct a DAG from given multiple topological orderings
I need to construct a DAG, from its given topological orderings (i.e. the graph $$G$$ created must have all the orderings given as its topological orderings). For simplicity, the vertices are labeled as first $$n$$ natural numbers. (Note that once created, th... | |
# seaneberhard/latex2wp
Tool for converting LaTeX-prepared documents to Wordpress-ready HTML
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### How to install
You need python 3.6+. You can install latex2wp using pip:
pip install git+https://github.com/se... |
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