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# arXiv vs MathOverflow - popularity of disciplines
Inspired by the comparison of programming languages by GitHub and Stack Overflow activity (e.g. this one for 2015) I decided to look at the popularity of mathematical disciplines by using data from both arXiv and MathOverflow (see also my motivation for getting a dum... | {} |
# Title case for theorem argument
I would like to make the optional argument I pass to a theorem environment (which puts the argument in a parenthetical next to the theorem number - typically for naming a theorem) have title case i.e. non-articles should be capitalized. I am able to do this for section headings using ... | {} |
torsdag 27 oktober 2011
Two-Way Transfer of Heat as OLR/DLR Violates the 2nd Law
In a sequence of posts on radiative heat transfer between two bodies of different temperature, I have compared two views with deep historical roots:
1. One-way transfer from hot body to cold body (Pictet)
2. Two-way transfer with net tra... | {} |
Models of DNA Denaturation Dynamics: Universal Properties
#### M. Baiesi, E. Carlon
2013, v.19, Issue 3, 569-576
ABSTRACT
We briefly review some of the models used to describe DNA denaturation dynamics, focusing on the value of the dynamical exponent $z$, which governs the scaling of the characteristic time $\tau\s... | {} |
The open source CFD toolbox
# Properties
• Neumann condition
• implicit
Face values are evaluated according to:
$\phi_f = \phi_c + \Delta \grad{\phi}_{ref}$
where
$$\phi_f$$ = face value $$\phi_c$$ = cell value $$\grad(\phi)_{ref}$$ = reference gradient $$\Delta$$ = face-to-cell distance
# Usage
<patchName>
{ | {} |
# Tag Info
21
I can only talk about quantitative trading. As a rule of thumb, the lower frequency you work in, the more econometrics is important, whereas for a higher frequency, the more econometrics becomes useless. (I would still recommend a top econometrician for HFT since they have what it takes to succeed, it's... | {} |
Three masses are connected to two springs as shown. Write Newton's Second Law for each mass using the coordinates shown. Each coordinate is the distance from equilibrium. Assume that x1(t)=A1e^iwt and x2(t)=A2e^iwt and x3(t)=A3e^iwt. Substitute those expressions in and solve the eigenvalue problem. Find the eigenvalues... | {} |
# Use The Definition To Find An Expression For The Area Under The Curve Y = X3 From 0 To 1 As A Limit.
(a) Use Definition 2 to find an expression for the area under the curve y= (x^3) from 0 to 1 as a limit. Then use
the following formula
(1^3) + (2^3) + (3^3) +...... + (n^3) = [(n(n+1))/2]^2
to evaluate the limit.... | {} |
Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01r781wj434
DC FieldValueLanguage
dc.contributor.authorTunstall, Lori Elizabeth-
dc.contributor.otherCivil and Environmental Engineering Department-
dc.date.accessioned2016-06-08T18:38:23Z-
dc.date.available2016-06-08T18:38... | {} |
# "What PDE is obeyed by the following function..."
1. Mar 9, 2016
### sa1988
1. The problem statement, all variables and given/known data
Part (a) below:
2. Relevant equations
3. The attempt at a solution
There's more to this question but I'm only stuck on this first part so far.
I have no idea what specific P... | {} |
# Thread: Setting up and solving equations to finding the number of stamps
1. ## Setting up and solving equations to finding the number of stamps
Peter has 35 stamps. Some are valued at 2 cents, others at 5-cents, and the remainder at 10 cents. he has three times as many 5-cent stamps as he has 2-cent stamps and the ... | {} |
# What is the trigonometric form of (12-2i) ?
Mar 11, 2016
$2 \sqrt{37} \left[\cos \left(- 0.165\right) + i \sin \left(- 0.165\right)\right]$
#### Explanation:
Using the following formulae :
• r^2 = x^2 + y^2
• theta = tan^-1 (y/x)
here x = 12 and y = - 2
hence ${r}^{2} = {12}^{2} + {\left(- 2\right)}^{2} = 14... | {} |
• # question_answer The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly A) 100 $\overset{\text{o}}{\mathop{\text{A}}}\,$ B) 123 $\overset{\text{o}}{\mathop{\text{A}}}\,$ C) 1.23 $\overset{\text{o}}{\mathop{\text{A}}}\,$ D) 0.123 $\overset{\text{o}}{\mathop{\text{A}}}... | {} |
# Impose the compatibility conditions for mixed finite elements method in Stokes equation
$\newcommand{\v}[1]{\boldsymbol{#1}}$ Suppose we have following Stokes flow model equation:
\tag{1} \left\{ \begin{aligned} -\mathrm{div}(\nu \nabla \v{u}) + \nabla p &= \v{f} \\ \mathrm{div} \v{u} &= 0 \end{aligned} \right. whe... | {} |
# EE Program vs Physics (Masters degree)
• Programs
## Main Question or Discussion Point
Hi everyone.
Recently, I started a MS program (terminal) in applied physics. I'm noticing my desire for physics really isn't there. The core coursework (classical mechanics, math physics) thus far isn't too interesting, thus I'... | {} |
Cisco 9148s Datasheet, Sklz Gold Flex Golf Trainer, Thermostat With Dry Contacts, Household Type Example, Phonics Google Slides, ...">
# acceleration due to gravity calculator pendulumBLOGブログ
2022.5.23
acceleration due to gravity calculator pendulum
When released, the restoring force acting on the pendulum's mass ca... | {} |
Browse Questions
# Consider the following statements Statement 1: Voltmeter is much better than a potentiometer for measuring the emf of the cell Statement 2: A potentiometer draws no current while measuring the emf of the cell
$\begin {array} {1 1} (A)\;Both \: the \: statements\: are\: true.\: Statement\: 2\: is\... | {} |
# Show that if there exist two complex numbers $a,b$ such that $f(a)=a$ and $f(b)=b$ then $f(z)=z$ for all $z\in B(0,1)$.
Let $f:B(0,1) \to B(0,1)$ holomorphic. Show that if there exist two complex numbers $a,b$ such that $f(a)=a$ and $f(b)=b$ then $f(z)=z$ for all $z\in B(0,1)$.
There is a suggestion in the excercis... | {} |
# The correct option for free expansion of an ideal gas under adiabatic condition is:
more_vert
The correct option for free expansion of an ideal gas under adiabatic condition is:
(1) q = 0, $\Delta$T = 0 and w = 0
(2) q = 0, $\Delta$T < 0 and w > 0
(3) q < 0, $\Delta$T = 0 and w = 0
(4) q > 0, $\Delta$T > 0 and w... | {} |
Polynomials and Commutativity
Standard
In high school, I came to know about the statement of the fundamental theorem of algebra:
Every polynomial of degree $n$ with integer coefficients have exactly $n$ complex roots (with appropriate multiplicity).
In high school, a polynomial = a polynomial in one variable. Then ... | {} |
• lgbasallote
what are the kinds of "suit" latex? aside from $$\diamondsuit$$ $$\heartsuit$$ $$\spadesuit$$ $$\clubsuit$$
LaTeX Practicing! :)
Looking for something else?
Not the answer you are looking for? Search for more explanations. | {} |
# C++ code to count number of unread chapters
Suppose we have an array of pairs P. Where P[i] is in the form (l, r), and have another number k. Consider we are going to read a book with n chapters. so that one page of the book belongs to exactly one chapter and each chapter contains at least one page. We have read som... | {} |
# Globally altering styles
Is there a generally applicable technique which will, for any tag/environment used in a LaTeX document, allow the default styling of the contents of instances of that tag/environment to be tweaked in the preamble?
• For instance, if I decided that all instances of \emph{} in the document sh... | {} |
# Kaplansky for Projections
Let $H$ be a Hilbert space, and $A$ a $C^*$-subalgebra of $B(H)$ (the bounded operators on $H$). Let $B$ be the strong-operator closure of $A$, so that in particular, $B$ is a von-Neumann-algebra.
According to the Kaplansky-Theorem:
The … in the unit ball of $A$ is s-o dense in the … in u... | {} |
The ScienceMedia Network
#### SPH simulation of a particle impact on a ductile target
Author: Christian Nutto
The sequence shows an impacting body on a ductile target made of Al6061-T1. The impacting body is assumed to be ideally hard. The impact velocity is $45 \mathrm{m/s}$ and is tilted $51^°$ from the horizontal ... | {} |
# When should we use the principles of tidy data by Hadley Whickham, and when should we avoid using it?
I have been studying and data science for the past 6 months, however I just came across the principles of tidy data by Hadley Wickham in an article by Jean-Nicholas Hould.
This completely changed my perspective of ... | {} |
# The Variation In Weight Of Body... At Different Position
The weight of a body is maximum $$\text{__________}$$.
× | {} |
# What's a divisor?
## Question:
What is a divisor?
## Mathematical Terminology
In mathematics, as well as in many other subjects, it's important to use correct terminology. There are many commonly-used math terms that you should know, such as quotient, dividend, numerator, denominator, and polygon.
## Answer and ... | {} |
• Definition for "centumviral"
• Of or related to the centumviri
• Sentence for "centumviral"
• Toucheronde, which did not seem very… | {} |
Let $$\mathfrak{g}$$ be a complex semisimple Lie algebra. Let $$W$$ be its Weyl group.
I would like to know whether $$W$$ is always finite? If so, why?
## closed as off-topic by Shaun, Thomas Shelby, Leucippus, Eevee Trainer, Parcly TaxelMar 18 at 6:05
This question appears to be off-topic. The users who voted to cl... | {} |
# Enthalpy Of Neutralization Lab
Calorimetry Measurements of Fusion, Hydration and Neutralization Experiment 7 7-2. INTRODUCTION Neutralization of hydronium or hydroxide ion to form water is widely used as the basis for volumetric determinations of acids, bases and salts of weak acids. Entalphy's Experiment report 1. ... | {} |
Find repeat regions on 100 eukaryotic assemblies
1
0
Entering edit mode
18 months ago
Chvatil ▴ 90
Hello everyone, I have a hundred genomes and I'm looking for repeated regions along these assemblies.
First of all, I thought of using RepeatModeler, only the most familiar among you know that it is not at all optimized... | {} |
# Tag Info
15
Your 102-digit nuber is two digits more than the first RSA challenge RSA-100 that has 330-bit. This can be easily achieved with existing libraries like; CADO-NFS ; http://cado-nfs.gforge.inria.fr/ NFS factoring: http://gilchrist.ca/jeff/factoring/nfs_beginners_guide.html Factoring as a service https://s... | {} |
Q16 2019
Hi, why this statement is TRUE? Isn't the bounded set A can be non-convex? Thanks.
The LMO is simply minimizing a linear function over a set X and the set does not have to be convex. So it makes sense to write $$LMO_A$$. The "convexity" of X we see in the slides result from the fact that we are using Frank-W... | {} |
# Incompleteness of quantum physics
Incompleteness of quantum physics
Incompleteness of quantum physics is the assertion that the state of a physical system, as formulated by quantum mechanics, does not give a complete description for the system, assuming the usual philosophical requirements ("reality", "nonlocality"... | {} |
# Sakura
## HITCON CTF 2017
(Okay, this post is backdated.)
Disassembling the executable produces a huge amount of code. There are some basic obfuscations like a lot of trivial identity functions nested in each other, and a few functions that wrap around identity functions but just add some constant multiple of 16. ... | {} |
Unele aspecte privind poluarea atmosferei. măsurile ce se impun pentru prevenirea prejudicierii mediului
Conţinutul numărului revistei Articolul precedent Articolul urmator 99 2 Ultima descărcare din IBN: 2020-05-02 16:34 Căutarea după subiecte similare conform CZU 504.06 (103) Știința mediului înconjurător (311)... | {} |
# Calculus
Using the definition of derivative state the function, f(x) and the value of a for lim as h->0 of (square root of (121+h) -11)/h
1. 👍 0
2. 👎 0
3. 👁 115
1. if
f(x) = x^.5
then
f(x+h) = (x + h)^.5
[f(x+h) - f(x)]/h = [(x+h)^.5-x^.5]/h
binomial expansion of
(x+h)^.5 = x^.5 + .5 x^-.5 h ..... higher power... | {} |
# How to make your Facet Wrap / Facet Grid ggplots span across multiple pages in PDF
## while rendering from RMarkdown (Rmd)
This is going to be a very short post. It’s a problem I faced a few days back and after some DDGing, Github Issues scanning and some SOing - I found the answer. So, I thought to share it - for ... | {} |
# Why does power go up with the cube of the airspeed?
If i have an airplane with over 100 kN of thrust, and i want to accelerate from a velocity at which drag force is 25kN to a velocity twice higher, is it possible that i wont be able to do this because my engine doesn't have enough power, even though it has enough t... | {} |
Find all School-related info fast with the new School-Specific MBA Forum
It is currently 29 Jun 2016, 00:58
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
C... | {} |
# Unit circle
In mathematics, a unit circle is a circle with a radius of 1. The equation of the unit circle is ${\displaystyle x^{2}+y^{2}=1}$. The unit circle is centered at the Origin, or coordinates (0,0). It is often used in Trigonometry.
In a unit circle, where ${\displaystyle t}$ is the angle desired, ${\displa... | {} |
Augmented Dickey-Fuller Test/ Unit Root test on multiple time series dataframe in R
I have a dataset/dataframe in which I have calculated the daily log returns of five thousand companies and these companies are as column as well. I want carry out ADF test on this dataframe. I have found how to estimate ADF test on vec... | {} |
# Latex - How to type these symbols over chars in matrix
I want to to ask how I can type this matrix, especially that ^ over alphabetic characters.
I have something like this:
\begin{eqnarray}
\begin{pmatrix}
a+b & \overset{}{\epsilon + \omega} & \overset{}{\pi} \\
\vec{a} & \overleftrightarrow{AC} & \beta
\end{pma... | {} |
## Cryptology ePrint Archive: Report 2019/538
On Perfect Endomorphic Ciphers
Nikolay Shenets
Abstract: It has been 70 years since the publication of the seminal outstanding work of Claude Elwood Shannon, in which he first gave a mathematical definition of the cryptosystem and introduced the concept of perfect cipher... | {} |
# How to exclude sections of bad data from time-series data before training an LSTM network
I am using LSTM network for predicting IOT time-series data receiving from un-reliable devices and networks.
This results in several multiple sections [continuous streak of bad data for several days until the problem is fixed].... | {} |
# Recent and upcoming talks by Jacek Tryba
## Jacek Tryba: Homogeneity of ideals
Tuesday, March 6, 2018, 17:15 Wrocław University of Technology, 215 D-1 Speaker: Jacek Tryba (University of Gdansk) Title: Homogeneity of ideals Abstract: The homogeneity family of the ideal $\mathcal{I}$ is a family of subsets such that... | {} |
## MSC coordinate system: Theta and Phi
Chandra uses a number of coordinate systems to describe locations. The MSC coordinate system is defined by the Theta and Phi axes, which give the off-axis angle and azimuth coordinates of the mirror. | {} |
• # question_answer Solve for $x:\frac{1}{(x-1)(x-2)}+\frac{1}{(x-2)(x-3)}=\frac{2}{3},x\ne 1,2,3$
We have, $\frac{1}{(x-1)(x-2)}+\frac{1}{(x-2)(x-3)}=\frac{2}{3},x\ne 1,2,3$ $3(x-3)+3(x-1)=2(x-1)(x-2)(x-3)$ $3x-9+3x-3=2(x-1)(x-2)(x-3)$ $6x-12=2(x-1)(x-2)()x-3$ $6(x-2)=2(x-1)(x-2)(x-3)$ $3=(x-1)(x-3)$ $3={{x}^{2}}-3x... | {} |
# How can you highlight a C compiler directive spanning multiple lines?
In my \lstset{...} I have morecomment=[l][{\color[rgb]{0.1, 0.2, 0.8}}]{\#}, which I've seen used to give preprocessor commands colour. This works just fine but I'd like to get multi-line macros to be highlighted too, for example:
\begin{lstlisti... | {} |
This presentation is the property of its rightful owner.
1 / 16
Lemniscates PowerPoint PPT Presentation
Lemniscates. Lemniscates. The Lemniscate of Bernoulli.
Lemniscates
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on... | {} |
## OG: For all real numbers a, b, c, d, e, and f, the operation @ is defined by the equation
##### This topic has expert replies
Master | Next Rank: 500 Posts
Posts: 394
Joined: 02 Jul 2017
Thanked: 1 times
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### OG: For all real numbers a, b, c, d, e, and f, the operation @ is defined by the equa... | {} |
# Is there a mathematical concept of fractions using transfinite numbers as numerators and denominators?
While looking at Cantors method of proof, which he used to show that the set of the rational numbers is countable and that it has got the same cardinality (Aleph-naught) as the set of the natural numbers, I recogni... | {} |
User:
• Matrices
• Algebra
• Geometry
• Funciones
• Trigonometry
• Coordinate geometry
• Combinatorics
Suma y resta Producto por escalar Producto Inversa
Monomials Polynomials Special products Equations Quadratic equations Radical expressions Systems of equations Sequences and series Inner product Exponential equatio... | {} |
### CAT 2007 Question 10
Instructions
Directions for the following two questions:
Let S be the set of all pairs (i, j) where 1 <= i < j <= n , and n >= 4 (i and j are natural numbers). Any two distinct members of S are called “friends” if they have one constituent of the pairs in common and “enemies” otherwise.
For... | {} |
## Google Xlookup sheets do not work but require results in the table showing the maximum date according to the condition of the user list.
Problem 1:
`Page-2-Seznam članov > Coloumn C` : It must be the maximum dates.
The function must search the list for the name of `Page-2-Seznam članov > Coloumn B` and in the area... | {} |
# What is the relationship between the energy differences of the orbits in an atom and the light emitted by the atom?
When an electron makes a transition from a level of higher energy ${E}_{h}$ to a level of lower energy ${E}_{l}$, then it emits a single photon of frequency,
$\nu = \frac{{E}_{h} - {E}_{l}}{h}$ where $... | {} |
1. ## statistics problem help
Consider the Discrete PDF
$\displaystyle f(x;q)=(q/2)^{|x|}(1-q)^{1-|x|}$ for $\displaystyle x=-1,0,1$ and $\displaystyle 0<q<1$
a) Is $\displaystyle f(x;q)$ a complete family? if so why?
b) Find a complete sufficient statistic for $\displaystyle q$
c)Find the Uniformly Minimum Varian... | {} |
# Is this set of 6 transformations fundamental to geometry?
Is there anything fundamental in geometry about this set of 6 transformations: Reflection, Shear, Rotation, Dilation, Squeeze and Translation?
I am looking for the cognitive or metaphysical foundations for geometry. I am especially interested in the ways we ... | {} |
I posted an article a while back, entitled Very Fast, High-Precision SIMD/GPU Gradient Noise, where I outlined a technique for achieving double-resolution noise at speeds close to that when using float arithmetic. The key observation was that floor could be used on cell boundaries to mask off the ranges that require do... | {} |
Chapter 16. Electromagnetic Waves
# 16.3 Energy Carried by Electromagnetic Waves
### Learning Objectives
By the end of this section, you will be able to:
• Express the time-averaged energy density of electromagnetic waves in terms of their electric and magnetic field amplitudes
• Calculate the Poynting vector and t... | {} |
## Reading the Comics, August 10, 2019: In Security Edition
There were several more comic strips last week worth my attention. One of them, though, offered a lot for me to write about, packed into one panel featuring what comic strip fans call the Wall O’ Text.
Bea R’s In Security for the 9th is part of a storyline a... | {} |
# About Constant Bitrate Encoding
What most of us are used to when we encode an MP3 File, is that we can set a bitrate – such as 192kbps – and, the codec will produce an MP3 File with that bitrate. If that was all there is to it, we’d have Constant Bitrate encoding, aka ‘CBR’.
But in many cases, the actual encoding s... | {} |
mathlibdocumentation
group_theory.schur_zassenhaus
The Schur-Zassenhaus Theorem #
In this file we prove the Schur-Zassenhaus theorem.
Main results #
• exists_right_complement'_of_coprime : The Schur-Zassenhaus theorem: If H : subgroup G is normal and has order coprime to its index, then there exists a subgroup K w... | {} |
Integer type: int32 int64 nag_int show int32 show int32 show int64 show int64 show nag_int show nag_int
Chapter Contents
Chapter Introduction
NAG Toolbox
# NAG Toolbox: nag_correg_coeffs_pearson_subset_miss_pair (g02bj)
## Purpose
nag_correg_coeffs_pearson_subset_miss_pair (g02bj) computes means and standa... | {} |
## Friday, 23 December 2016
### Home Heating IoT Project - Software planning
For this project I want to be able to control the room heating in my house either manually or on a timed system.
I decided to plan it using a flowchart, as I couldn't get my head around the programming easily without visualising it.
Here's... | {} |
# automorphism, endomorphism, isomorphism, homomorphism within $\mathbb{Z}$
From Wikipedia: An invertible endomorphism of $$X$$ is called an automorphism. The set of all automorphisms is a subset of $$\mathrm{End}(X)$$ with a group structure, called the automorphism group of $$X$$ and denoted $$\mathrm{Aut}(X)$$. In t... | {} |
# JEE Main & Advanced Mathematics Matrices Positive Integral Powers of a Matrix
## Positive Integral Powers of a Matrix
Category : JEE Main & Advanced
The positive integral powers of a matrix A are defined only when A is a square matrix.
Also then ${{A}^{2}}=A.A$, ${{A}^{3}}=A.A.A={{A}^{2}}A$.
Also for any positiv... | {} |
# About Green's function in time dependent schrodinger equation
1. Jul 18, 2012
### wphysics
While I was studying Ch 2.5 of Sakurai, I have a question about Green's function in time dependent schrodinger equation. (Specifically, page 110~111 are relevant to my question)
Eq (2.5.7) and Eq (2.5.12) of Sakurai say
$\p... | {} |
197 views
Rearrange the following sentences to form a coherent paragraph.
1. This has huge implications for the health care system as it operates today, where depleted resources and time lead to patients rotating in and out of doctor's offices, oftentimes receiving minimal care or concern (what is commonly referred t... | {} |
# Show norms are equiv. on $C^1[a,b]$: $\Vert f\Vert _1=\Vert f \Vert_{\infty}+\Vert f' \Vert_{\infty},\Vert f \Vert_2=|f(a)|+\Vert f' \Vert_{\infty}$
Here is what I got as a proof. My question is at the end. Thanks
On $C^1[a,b]$ we have the norms $$\Vert f\Vert _1 = \Vert f \Vert_{\infty} + \Vert f' \Vert_{\infty},\... | {} |
### Home > APCALC > Chapter 5 > Lesson 5.4.1 > Problem5-141
5-141.
The graph below of $y = f ^\prime(x)$, the derivative of some function $f$, is composed of straight lines and a semicircle. Determine the values of $x$ for which $f$ has local minima, maxima, and points of inflection over the interval $[–3, 3]$. ... | {} |
A proposal to simplify the notation of EDOs with bad fifths
Dave Keenan
Posts: 882
Joined: Tue Sep 01, 2015 2:59 pm
Location: Brisbane, Queensland, Australia
Contact:
Re: A proposal to simplify the notation of EDOs with bad fifths
Here's another way of looking at the small-EDO notation problem. I've added lines of c... | {} |
# HDF4 support for GDAL on Arch Linux
I have been trouble reading HDF files with OTB on Arch Linux for a while. I finally took the time to investigate this problem and come to a solution.
At the beginning I was misled by the fact that I was able to open a HDF5 file with Monteverdi on Arch. But I finally understood th... | {} |
View Single Post
Recognitions:
Quote by Mentz114 I get a different result for the Ricci scalar, viz $$\frac{\partial rf}{re^{f}}$$ where $\partial r$ is differentiation wrt r.
The Ricci scalar is $R = \frac{2 f^\prime}{r} \, \exp(-2f)$ in the notation I used above. (The Ricci tensor, with components evaluated wrt the... | {} |
## Algebra: A Combined Approach (4th Edition)
$\dfrac{(2x^{1/5})^{4}}{x^{3/10}}=16x^{1/2}$
$\dfrac{(2x^{1/5})^{4}}{x^{3/10}}$ Evaluate the power indicated in the numerator: $\dfrac{(2x^{1/5})^{4}}{x^{3/10}}=\dfrac{16x^{4/5}}{x^{3/10}}=...$ Evaluate the division: $...=16x^{4/5-3/10}=16x^{1/2}$ | {} |
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## Classification of 6-manifolds with fundamental group $\pi_{1}=\mathbb Z/p$ and second homotopy group $\pi_{2}=0$
We classify the smooth closed 6-manifolds with fundamental group $\pi_{1}\cong\mathbb Z /p$ and second homotopy group $\pi_{2}=0$... | {} |
# Motor control - 1 phase to 3 phase inverter issue
#### blimp
Joined Feb 9, 2021
6
I have a wood lathe (Ejca TLS30) wich runs on 1 phase 230V, but the motor is a 3 phase motor, driven by a Hitachi inverter (HFC-VWE 2.5SBE) with stepless speed control. The lathe is 30 years old, but they still make them more or less ... | {} |
# B One way twin
#### PeroK
Homework Helper
Gold Member
2018 Award
But 1) and 3) do not take place at the same position relative to A as the acceleration in the simple case, assuming the same total space time intervals for both scenarios.
I really don't see why not. We're assuming that B executes some sort of periodi... | {} |
Geodesic for Electromagnetic forces
Considering the fact that electrons tend to take the maximum conductance path to flow from A to B. This is justified by saying that $\vec{E}$ is larger in conductors. But once similarly it was thought for gravitation, that if in a region the gravity was stronger, the mass more likel... | {} |
# On a fallacy that people often commit to accuse the police of racism
After the death of Laquan McDonald (which for what it’s worth strikes me as being murder pure and simple, but this has no bearing on what I’m going to be talking about), the Mayor of Chicago created a task force, with the job of scrutinizing the pr... | {} |
# avocado_varianter_yaml_to_mux package¶
## avocado_varianter_yaml_to_mux.mux module¶
This file contains mux-enabled implementations of parts useful for creating a custom Varianter plugin.
class avocado_varianter_yaml_to_mux.mux.Control(code, value=None)
Bases: object
Container used to identify node vs. control se... | {} |
# A 1.25 kg weight is hung from a vertical spring. The spring stretches by 3.75 cm from its original, unstretched length. How much mass should you hang from the spring so it will stretch by 8.13 cm?
Mar 13, 2018
Remember Hookes law.
2.71Kg
#### Explanation:
Hooke's Law relates Force a spring exerts to an object att... | {} |
# Permutations and Combinations of ways of dividing into identical and non- identical groups
In how many ways can $8$ people be divided into
1. $4$ groups of $2$ people
2. First pair, second pair. Third pair and the fourth pair
How do you go about doing this question?
-
Are you familiar with binomial coefficients?... | {} |
# Convert to Regular Notation 29*10^6
Since the exponent of the scientific notation is positive, move the decimal point places to the right.
Convert to Regular Notation 29*10^6 | {} |
# The contrapositive of the statement " If you are born in India, then you are a citizen of India", is : Option 1) If you are not born in India, then you are not a citizen of India. Option 2) If you are not a citizen of India, then you are not born in India. Option 3) If you are a citizen of India, then you are born in... | {} |
SCIENTIA SINICA Informationis, Volume 50 , Issue 11 : 1680(2020) https://doi.org/10.1360/SSI-2019-0287
## New versions of Lovász Local Lemma and their applications
• AcceptedFeb 26, 2020
• PublishedOct 19, 2020
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### Abstract
Lovász Local Lemma (LLL) is an important tool in combinatorics and probability ... | {} |
# Test whether data set approximates normal distribution using mean and median
I am of the knowledge that to test whether a data set approximates a normal distribution, the median and the mean should be approximately equal. So my question is to what degree should the difference between the median and the mean be accep... | {} |
# Automatic structures
@article{Blumensath2000AutomaticS,
title={Automatic structures},
author={Achim Blumensath and Erich Gr{\"a}del},
journal={Proceedings Fifteenth Annual IEEE Symposium on Logic in Computer Science (Cat. No.99CB36332)},
year={2000},
pages={51-62}
}
• Published 26 June 2000
• Computer Science
• Proc... | {} |
## After midnight, part 4: LaTeX
### Tuesday 11. December, 2007
What has happened since the last blog entry? Well, I’m not sick anymore and I live on my own now (okay, it’s relative “on my own”).
Unlike the previous After midnight -posts, this isn’t actually about a programming language.
Do you know “Structured tex... | {} |
Hey Tobias!
> We say that one probability space \$$(\Omega',{\mathcal B}', {\mathcal P}')\$$ *extends* another \$$(\Omega,{\mathcal B}, {\mathcal P})\$$ if there is a surjective map \$$\pi: \Omega' \rightarrow \Omega\$$ which is measurable (i.e. \$$\pi^{-1}(E) \in {\mathcal B}'\$$ for every \$$E \in {\mathcal B}\$$) a... | {} |
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# AtomTypes
This page gives hints on how to specify the types of atoms that form the system.
## Introduction¶
ABINIT needs to know the different types of atoms that form the system. The atoms assembled in a molecule or a solid are physically specified by their nuclear charge (and their mass for dyna... | {} |
# How do you write in simplest radical form the coordinates of point A if A is on the terminal side of angle in standard position whose degree measure is theta: OA=8, theta=120^circ?
##### 1 Answer
Mar 6, 2018
Coordinates of color(blue)(A (-4, 4 sqrt3)
#### Explanation:
${120}^{\circ}$ is in second quadrant
${A}_{... | {} |
Banach Journal of Mathematical Analysis
Poisson semigroup, area function, and the characterization of Hardy space associated to degenerate Schrödinger operators
Abstract
Let
$\begin{eqnarray*}Lf(x)=-\frac{1}{\omega(x)}\sum_{i,j}\partial_{i}(a_{ij}(\cdot)\partial _{j}f)(x)+V(x)f(x)\end{eqnarray*}$ be the degenerate ... | {} |
• ### A Multi-Planet System Transiting the $V$ = 9 Rapidly Rotating F-Star HD 106315(1701.03807)
April 21, 2017 astro-ph.SR, astro-ph.EP
We report the discovery of a multi-planet system orbiting HD 106315, a rapidly rotating mid F-type star, using data from the K2 mission. HD 106315 hosts a $2.51\pm0.12\,R_\oplus$ sub... | {} |
# Orthonormal basis
• Apr 3rd 2011, 05:18 AM
mechaniac
Orthonormal basis
let $(e_{1},e_{2},e_{3})$ be a positive oriented orthonormal basis.
Define a new basis $(f_{1},f_{2},f_{3})$
* Show that $(f_{1},f_{2},f_{3})$ also is a orthonormal basis.
* determine the coordinates for the vector $u = 7e_{1}+1e_{2}-4e_{3}$ in... | {} |
# Fractional Calculus Power Rule Derivation
I know the proof for the fractional calculus power rule using the definition of the Riemann-Liouville Fractional Integral, $_{c}D_x^{-\nu}f(x) = \frac{1}{\Gamma({\nu})}\int_{c}^{x}(x-t)^{\nu - 1}f(t)dt$, but I don't understand one part in the process.
$D^{- \nu}x^{\mu} = \f... | {} |
# Thread: Finding x and y
1. ## Finding x and y
Can someone show me how to find x and y in this question?
2. Originally Posted by user_5
Can someone show me how to find x and y in this question?
The triangles are similar, so the corresponding sides are proportional.
i.e. $15 = 10k, 24 = kx, y = 12k$.
Solve for $k$... | {} |
# Transverse Wave Problem
1. Nov 20, 2005
### Ginny Mac
Here is a transverse wave problem:
Consider transverse waves moving along a stretched spring fixed to an oscillator. Suppose the mass of the spring is 10 grams, its relaxed (not stretched) length is 1.00 meters, and its spring constant (if stretched) is 5.0 N/... | {} |
# What is integral `int ` 1/(e^x + e^(-x)) dx?
You need to re-write the denominator at integrand, using the negative exponent property, such that:
`int 1/(e^x + e^(-x))dx = int 1/(e^x + 1/e^x)dx`
`e^x + 1/e^x = (e^(2x) + 1)/e^x`
Replacing `(e^(2x) + 1)/e^x` for the original form of denominator, yields:
`int 1/(e^x... | {} |
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