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# Are symmetric matrices necessarily positive-definite / positive semi-definite?
I am trying to prove this just to be clear about this but I don't have enough conditions to force this idea to be true, so I doubt it is.
Are symmetric matrices always at least positive semi-definite?
I know the other way around, by con... | {} |
# Classical Calculi as Universal Quotients
As is well known, every differential calculus $(\Omega,d)$ over an algebra $A$ is a quotient of the universal calculus $(\Omega_A,d)$, by some ideal $I$. In the classical case, when $A$ is the coordinate ring of a variety $V(J)$ (for some ideal of polynomials $J$), and $(\Ome... | {} |
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# 11 trillion gallons to replenish california drought
Needed: 11 Trillion Gallons to Replenish California Drought
John, space measurements are the future of climate data mining and research:
"Spac... | {} |
I woke up this morning to find myself with another Enlightened badge awarded for a relatively old question for which I received no recent votes, nor recent acceptance.
Furthermore the list of "Recent badges" was completely filled by Enlightened badges.
And lastly, after counting the number of answers for which I shou... | {} |
Opened 12 years ago
# Add a 'fixes' property to changesets
Reported by: Owned by: Lewis Baker ttressieres normal PerforcePlugin normal 0.10
### Description
It would be nice if the changeset view displayed all of the 'p4 fixes' for that changeset, listing the associated tickets fixed by that change.
This would make... | {} |
# An example homography matrix than shows after transformation, the point inside the triangle could be outside
assume we have 3 vertices and a point inside the triangle.
with a homography matrix
[a,b,c]
[d,e,f]
[g,h,1]
Also the final location of the 3 vertices and the point that is not inside the triangle anymore... | {} |
# Can you help how to write this? [closed]
Please can you help me with this ,how can i write this one?
$$\left.\frac{dy}{dx}\right|_{x=-1}=-5$$
$\frac{dy}{dx}\,{\rule[-3.5ex]{.1ex}{7.0ex}\,}_{x=-1}=-5$ | {} |
# Ramified Integrals, Singularities and Lacunas
## byV.A. Vassiliev
### Pricing and Purchase Info
\$168.27 online
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Earn 841 plum® points
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Ships free on orders over \$25
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Many special functions occurin... | {} |
# Continuous Bernoulli distribution
In probability theory, statistics, and machine learning, the continuous Bernoulli distribution[1][2][3] is a family of continuous probability distributions parameterized by a single shape parameter ${\displaystyle \lambda \in (0,1)}$, defined on the unit interval ${\displaystyle x\i... | {} |
Till innehåll på sidan
# Arvind Ayyer: Hook-lengths of random cells in random partitions
Tid: Ti 2020-01-28 kl 14.30 - 15.20
Föreläsare: Arvind Ayyer, Indian Institute of Science
### Abstract
For an integer $$t \geq 2$$, the $$t$$-core of a partition $$\lambda$$ is another partition obtained by removing as many ri... | {} |
# What would happen if you tried to squeeze a gas into a smaller container
###### Question:
What would happen if you tried to squeeze a gas into a smaller container
$What would happen if you tried to squeeze a gas into a smaller container$
### HURRY PLZ I NEED THIS Read the scenario and answer the question that fol... | {} |
# Visual Profiler
The Visual Profiler allows the user to profile function calls. This tool works similar to the visual inspector, as several charts are provided for visualizing the data:
• Flamegraph
• Table
• Time Tree
• Space Tree
• TMC Tree
• Timeline
The profiler measures runtime and memory usage for the functio... | {} |
# Generating random and secure CSRF tokens
I googled around for secure random number generation and random string generation, combining them with some user data.
Is this good or am I totally off-base? I don't know much about cryptography but I do not see many alternatives, other than some bad code that gets copied ar... | {} |
• A second type of unsupervised learning problem - dimensionality reduction. Why should we look at dimensionality reduction?
• One is data compression, data compression not only allows us to compress the data and have it therefore use up less computer memory or disk space, but it will also allow us to speed up our lea... | {} |
# corrmtx
Data matrix for autocorrelation matrix estimation
## Syntax
``H = corrmtx(x,m)``
``H = corrmtx(x,m,method)``
``[H,r] = corrmtx(___)``
## Description
````H = corrmtx(x,m)` returns an (n+`m`)-by-(`m`+1) rectangular Toeplitz matrix H = `H` such that H†H is a biased estimate of the autocorrelation matrix for... | {} |
# Derivative of e^x
1. Feb 9, 2005
### Aki
I don't understand why the derivative of e^x is e^x itself.
2. Feb 9, 2005
### Justin Lazear
Have you tried apply the definition of a derivative for $f(x) = e^x$?
$$\frac{d}{dx}f(x) = \lim_{h\to 0}\frac{f(x+h) - f(x)}{h}$$
--J
3. Feb 9, 2005
### matt grime
There are... | {} |
# Chapter 7 - Test - Page 416: 29
$b=-\frac{5}{3}$
#### Work Step by Step
Step 1: Since vectors $5\textbf {i}+12\textbf {j}$ and $4\textbf {i}+b\textbf {j}$ are perpendicular, their dot product must be zero. $(5,12)\cdot(4,b)=5(4)+12(b)=20+12b=0$. Step 2: Now, to find $b$, we must solve the above equation. Step 3: $... | {} |
The equivalence of “Every surjection has a right inverse” and the Axiom of Choice
This is a problem from Tao's Analysis I.
We are asked to show that the axiom of choice is equivalent to the statement that for any sets $A$ and $B$ for which a surjection $g:B\to A$ exists, an injection $f:A\to B$ exists.
I have proven... | {} |
statistical copolymer
https://doi.org/10.1351/goldbook.S05955
A @C01335@ consisting of @M03667@ in which the sequential distribution of the @M04018@ obeys known statistical laws.
Note:
An example of a statistical @C01335@ is one consisting of macromolecules in which the sequential distribution of monomeric units follo... | {} |
Think Globally, Fit Locally
# 1 Introduction
Modeling spectral data has garnered wide interest in the last four decades. Spectroscopy is the study of the spectral response of a matrix (e.g. soil, plant material, seeds, etc.) when it interacts with electromagnetic radiation. This spectral response directly or indirect... | {} |
RUS ENG JOURNALS PEOPLE ORGANISATIONS CONFERENCES SEMINARS VIDEO LIBRARY PACKAGE AMSBIB
General information Latest issue Archive Impact factor Journal history Search papers Search references RSS Latest issue Current issues Archive issues What is RSS
Fundam. Prikl. Mat.: Year: Volume: Issue: Page: Find
... | {} |
# Calculating the Median from a Withington Census
I have been struggling with how you solve the first part of the question, as when I put the values for household size in order, I end up with the median as 3, but the mark scheme says that 2 is the answer for the median. Because of this, I do not understand how you can... | {} |
# Inverse Laplace of: (5-2s) / (s^2 - 2s +5)
###### Question:
Inverse Laplace of:
(5-2s) / (s^2 - 2s +5)
#### Similar Solved Questions
##### This Question: 3 pts 15 of 46 (0 complete) This Test: 100 pts possible oe Find...
This Question: 3 pts 15 of 46 (0 complete) This Test: 100 pts possible oe Find the critical ... | {} |
# 3.10: Determining a Chemical Formula from Experimental Data
In the previous section, we discussed the relationship between the bulk mass of a substance and the number of atoms or molecules it contains (moles). Given the chemical formula of the substance, we were able to determine the amount of the substance (moles)... | {} |
# Sphere of influence (astrodynamics)
A sphere of influence (SOI) in astrodynamics and astronomy is the oblate-spheroid-shaped region around a celestial body where the primary gravitational influence on an orbiting object is that body. This is usually used to describe the areas in the Solar System where planets domina... | {} |
# What is the cardinality of the countable ordinals?
Every countable ordinal $\alpha$ can be written uniquely in Cantor canonical form as a finite arithmetical expression, say $C(\alpha)$. We thus have the 1-1 correspondence between the countable ordinals and their corresponding finite Goedel (ordinal) numbers:
$C(\a... | {} |
## Precalculus (10th Edition)
Published by Pearson
# Chapter 1 - Graphs - 1.1 The Distance and Midpoint Formulas - 1.1 Assess Your Understanding - Page 6: 5
#### Answer
$\frac{1}{2}bh$
#### Work Step by Step
We find the area ($A$) of a triangle using the formula : $A=\frac{1}{2}bh$ where b = base and h = altitude... | {} |
Electric field inside a uniformly polarised cylinder
niko_.97
Moved from a technical forum, so homework template missing
This is problem 4.13 from Griffiths (edition 3).
A very long cylinder, of radius a, carries a uniform polarization P perpendicular
to its axis. Find the electric field inside the cylinder. [Careful:... | {} |
# All Questions
49 views
### Is there a heuristic argument for the expression $\textbf{g} = \frac {\mathbf{S}}{c^2}$?
Electromagnetic momentum density and the Poynting vector are related by the simple expression: $$\textbf{g} = \frac {\mathbf{S}}{c^2}$$ It can be rigorously derived from Maxwell's equations, but is .... | {} |
# The Question
Hi, I've recently decided to switch over to IBM Plex, and while computer modern is very nice, it doesn't go too well with Plex it seems, and I'm not sure what I can do with regards to maths fonts.
Edit: I'm using pdfLaTeX
I'm looking for either good alternatives from people who have seen / know more t... | {} |
# Critique of realloc() wrapper
Seeking code correctness and best practices.
I would like to re-allocate various amounts of memory (0 or more) such that on systems that may return NULL for an allocation of 0 does not falsely imply a memory allocation error.
Given:
• void * (with a valid value or NULL already)
• siz... | {} |
# Special supersymmetric features of stop-chargino production at LHC
Abstract : The process of stop-chargino production at LHC has been calculated in the Minimal Supersymmetric Standard Model at the complete electroweak 1-loop level, assuming a mSUGRA symmetry breaking scheme. Several remarkable properties of the angu... | {} |
# 2019-17 0.7?
Let $$n \in \mathbb{Z}^+$$ and $$x, y \in \mathbb{R}^+$$ such that $$x^n + y^n = 1$$. Prove that
$(1-x)(1-y) \left( \sum_{k=1}^n \frac{1+x^{2k}}{1+x^{4k}} \right) \left( \sum_{k=1}^n \frac{1+y^{2k}}{1+y^{4k}} \right) < \frac{7}{10}.$
GD Star Rating
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2019-17 0.7?, 4.5 out of 5 based on 10 rati... | {} |
June 5, 2019
## Sin And Cos Chart Math
June 5, 2019
Sin and cos chart math the value you pass in as an argument to or is the angle and that is what you see on the x axis sin cos tan angle chart.
## Matrices Problems Math
June 5, 2019
Matrices problems math important questions for class maths inverse how to do mat... | {} |
NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
## GATE EE 2016 Set 2
Exam Held on Thu Jan 01 1970 00:00:00 GMT+0000 (Coordinated Universal Time)
Click View All Questions to see questions one b... | {} |
# homotopy equivalence between the cylinder of a map
Given a continuous map $$f\colon X\to Y$$ between two non-empty topological spaces, show that there is homotopy equivalence between the mapping cylinder $$(X\times I)\sqcup _{f}Y$$ and Y.
Here we have I=$$[0,1]$$, $$(x,1)\sim f(x)$$ on X.
Is the following proof co... | {} |
# The StorageRepository Class¶
The \TYPO3\CMS\Core\Resource\StorageRepository is the main class for creating and retrieving file storage objects. It contains a number of utility methods, some of which are described here, some others which appear in the other code samples provided in this chapter.
## Getting the Defau... | {} |
So "sharia law" is up there with "chai tea", "salsa sauce" and "manga comics", eh?
I recently learned that "elote", the Mexican word for "corn", also has specialised meaning in English.
A slightly more complicated :
2,3,4,2,5,6,4,2,7,8,6,4,2,9,6,4,2,…
What's my pattern?
Just closed a GitHub issue a fortnight young... | {} |
# Smooth concordance classes of topologically slice knots
June 3 to June 7, 2019
at the
American Institute of Mathematics, San Jose, California
organized by
Shelly Harvey, JungHwan Park, and Arunima Ray
## Original Announcement
This workshop will be devoted to the study of smooth concordance classes of topologic... | {} |
# Finding the sum of all the multiples of 3 or 5 below 1000, using list comprehension
I'm trying to compare my own implementation with another solution of Project Euler problem #1, which uses a list comprehension:
module Progression1 (sumProgressions) where
import Prelude
sumProgressions :: Integer -> Integer -> Int... | {} |
The discrete log and the factoring problem
Antoine Joux is a crypto expert at Versailles Saint-Quentin-en-Yvelines University. He is also one of the crypto experts at CryptoExperts, having joined this startup company last November. His work is featured in all three of the company’s current top news items, though the a... | {} |
0 like 0 dislike
does someone mind helping me with this question? Thank you!
0 like 0 dislike
Let's solve for x ~
$$\qquad \sf \dashrightarrow \: 7x + 3 = 24$$
$$\qquad \sf \dashrightarrow \: 7x = 24 - 3$$
$$\qquad \sf \dashrightarrow \: 7x = 21$$
$$\qquad \sf \dashrightarrow \: x = 21 \div 7$$
$$\qquad \sf \dash... | {} |
## Course Outline
• segmentGetting Started (Don't Skip This Part)
• segmentStatistics and Data Science: A Modeling Approach
• segmentPART I: EXPLORING VARIATION
• segmentChapter 1 - Welcome to Statistics: A Modeling Approach
• segmentChapter 2 - Understanding Data
• segmentChapter 3 - Examining Distributions
• segment... | {} |
Synopsis
# Cold Atoms, Meet Flux Quanta
Physics 8, s32
A cloud of atoms trapped close to a superconducting ring can detect the magnetic field inside the ring with single-quantum sensitivity.
Researchers are working on the development of hybrid quantum technologies that couple different quantum systems, such as cold ... | {} |
Math Help - Find out fallacy
1. Find out fallacy
FInd out fallcy in the proof. This "proof" will attempt to show that all people in Canada are the same age, by showing by induction that the following statement (which we'll call "S(n)" for short) is true for all natural numbers n:
Statement S(n): In any group of n pe... | {} |
main-content
## Über dieses Buch
This 8-volumes set constitutes the refereed of the 25th International Conference on Pattern Recognition Workshops, ICPR 2020, held virtually in Milan, Italy and rescheduled to January 10 - 11, 2021 due to Covid-19 pandemic. The 416 full papers presented in these 8 volumes were careful... | {} |
# I On gravity and the conservation of energy
1. May 10, 2018
### Monsterboy
"non-stationary" means in an expanding universe ?
http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/
I didn't get this part. For the system in my example of two massive particles, can we not say that the density ... | {} |
Importance of exports and economic growth, cross-country time series
12 Dec 2015
At a glance:
Fitting a mixed-effects model with auto-correlated residuals to longitudinal country-level data, showing how changing importance of exports is positively related to economic growth.
Exports and economic growth
I was looki... | {} |
# Use L'Hospital's rule to evaluate $\lim_{x\to\infty} \frac{\ln(1+e^x)}{x \cdot \arctan(x)}$
I want to evaluate $$\lim_{x \to \infty} \frac{\ln(1+e^x)}{x \cdot \arctan(x)}$$
Using L'Hospital, I get
$$\lim_{x \to \infty}\frac{\frac{e^x}{1+e^x}}{\arctan(x)+\frac{x}{1+x^2}}$$
Now I could use L'Hospital again, but it ... | {} |
# If mass is indeed invariant in Special Relativity, why do we still say things still have a “rest mass”?
My lecturer reaffirmed to us a classical misnomer that mass is relativistic, by pointing out that when considering relativistic momentum the Lorentz Factor is due to time dilation and thus a change in velocity, no... | {} |
• ### Spin-transfer assisted thermally activated switching distributions in perpendicularly magnetized spin valve nanopillars(1312.1994)
Dec. 6, 2013 cond-mat.mes-hall
We present switching field distributions of spin-transfer assisted magnetization reversal in perpendicularly magnetized Co/Ni multilayer spin-valve nan... | {} |
# How do we use an Ehresmann connection to define a semispray?
Let $M$ be a differentiable manifold, let $TM$ be its tangent bundle, and consider $TTM$, the double tangent bundle.
Let $V \subseteq TTM$ denote the vertical subbundle, which is determined in a canonical fashion. An Ehresmann connection is a choice of ho... | {} |
## Pad Attenuator (Pi, Tee, & Bridged-Tee) Calculator
### Inputs
Z0 Ohms Ω Attenuation dB
### Formulas Used
Pi Attenuator Tee Attenuator Bridged-tee Attenuator $\frac{1}{\frac{(a^2+1)}{Z_0(\Omega) (a^2-1)}-\frac{1}{R_2}}$ $Z_0(\Omega)\frac{(a^2+1)}{(a^2-1)}-R_2$ $Z_0(\Omega)$ $\frac{(a^2 - 1)}{2a}\sqrt{Z_0(\Omega)... | {} |
Homework Explained - Math Practice 101
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As a registered member you can:
Registration is free and doesn't require any type of payment information. Click here to Register.
Go to page... | {} |
Here's the question you clicked on:
johnny101 Group Title - 10 months ago 10 months ago
• This Question is Closed
1. jdoe0001
hmmm $$\bf sin^{-1}(sin(\theta))\implies \theta$$
2. jdoe0001
as far as the range, yes, that's the default range constraints for the inverse sine
3. jdoe0001
but I don't think we can get ... | {} |
### The following scenes represent a chemical reactio…
View
Rice University
This question is in the process of being solved. The video shown is an answer to a question that covers similar topics.
Problem 109
A 0.652 -g sample of a pure strontium halide reacts with excess sulfuric acid. The solid strontium sulfate f... | {} |
# Category: tabs
## dont work swiper slider inside tab and ng-repeat in angularjs
My slider is having difficulty when I’m on use tabs bootstrap and I use Angularjs ng-repet but when I get it and keep it inspacte without any changes , slider is fix and i reflesh on page having difficulty again . thx for help me Source... | {} |
# Physics Notes by Jakob Schwichtenberg
### Site Tools
quantum_field_theory
Edit the page and hit Save. See Formatting Syntax for Wiki syntax. Please edit the page only if you can improve it. If you want to test some things, learn to make your first steps on the playground.
218 -13 =
quantum_field_theory.txt · Las... | {} |
# List of available Indices
Order by: Name [^][v] • Abbreviation [^][v] • Applications [^][v] • Sensors [^][v] • References [^][v]
Page 1 of 2 [1] [2] · · >|
Nr Name Abbrev. Formula Variables Source # Sens. # Appl. # Ref.
1 Ashburn Vegetation Index AVI $2.0{\mathrm{\left[800:1100\right]}}-{\mathrm{\left[600:700\righ... | {} |
Let us also generate normal distribution with the same mean and standard deviation and … In the box plot, a box is created from the first quartile to the third quartile, a verticle line is also there which goes through the box at the median. If the box plot is relatively tall, then the data is spread out. How to read a... | {} |
# Introduction To Mathematical Drawing
### Prerequisites:
The following is a list of all prerequisites in order to make the most out of the following tutorial.
We previously learned how to plot function to generate shapes provided we have the equation for it. In this tutorial, we are going to learn to create our own... | {} |
# Consideran exchange economy with agents 1 and 2 and goods x and y. Agent 1lexicographically prefers.
Consideran exchange economy with agents 1 and 2 and goods x and y. Agent 1lexicographically prefers the good x: when o ered two non-identical bundlesof x and y, she strictly prefers the bundle with more of good x, bu... | {} |
# Example illustrating use of additivity of (probability) measures before introducing independence and conditioning
I would like to be able to illustrate why additivity is a natural property to assume for probability measures. While it is relatively simple to give a short hand waving intuitive analogy to volume or mas... | {} |
# Quantum teleportaion seems to occuring without entanglement in circuit (what's wrong)
Please, pardon the caption. No intention of making new theories. I am a bit confused about the quantum teleportation. I missed a hadamard gate before CNOT gate for creating the EPR pair. But the circuit seems to bee working and cop... | {} |
# FIBonacci sequence
For this code golf, you will receive an input of a fibonacci sequence, that is, a normal Fibonacci sequence but with one number incorrect. See, the sequence is fibbing! Get it? :D
Your job is to find out which number is incorrect, and print the index (0-based) of that number.
For example:
Input... | {} |
what is the ctft to dtft fator
yef smith
Joined Aug 2, 2020
246
Hello,It seems thaat we multyply the F- axres by T in order to convert to DTFT bu then i cant see how we get PI in the place of where FS was in CTFT
Fs*(2*pi)/FS =2Pi
but i cant see.
so i dont know what is the factor we multiply to get the converstion of... | {} |
Chapter 13.CR, Problem 66E
### Algebra and Trigonometry (MindTap ...
4th Edition
James Stewart + 2 others
ISBN: 9781305071742
Chapter
Section
### Algebra and Trigonometry (MindTap ...
4th Edition
James Stewart + 2 others
ISBN: 9781305071742
Textbook Problem
# Mortgage What are the monthly payments on a mortgage o... | {} |
- | | My book on MSBuild and Team Build | Archives and Categories Monday, December 24, 2012
# SlowCheetah build server support updated
A while back I blogged about how to setup SlowCheetah on a Build server. The solution was good but it was a bit unwieldy and error prone, especially those who are not comfortable with... | {} |
# The sum of consecutive odd numbers
Although related challenges have been asked, this one is different to warrant its own question.
# Challenge
Given a positive integer, return the longest sequence of consecutive positive odd integers whose sum is the given integer. If no such sequence exists, you may report an err... | {} |
## Laplace-Metropolis estimator of log marginal likelihood
### Description
As pointed out by Raftery (1996), the Laplace-Metropolis estimator performs well in calculating log marginal likelihood among other methods considered.
### Usage
```LaplaceMetropolis_admkr(theta, data_x, data_y,
method = c("likelihood", "L1c... | {} |
# Citation aliases in Beamer
I am using Beamer with the Frankfurt style. I have some citations in the presentation and a list of references at the end.
First I tried using the standard \cite and \bibliography with \bibliographystyle{plain}:
The Bibliography appears beautifully formatted in Beamer style with little i... | {} |
# OpenMP topic: Affinity
##### Experimental html version of Parallel Programming in MPI, OpenMP, and PETSc by Victor Eijkhout. download the textbook at https:/theartofhpc.com/pcse
25.1.2 : Effects of thread binding
25.1.3 : Place definition
25.1.4 : Binding possibilities
25.2 : First-touch
25.2.1 : C++
25.2.2 : Remark... | {} |
# Text interpretation in Griffith's intro to QM
It says in Griffith's chapter 2.1, that:
$$\tag{2.14} \Psi(x,t)~=~\sum_{n=1}^{\infty}c_n\,\psi_n(x) e^{(-iE_n t/\hbar)}$$ It so happens that every solution to the (time-dependent) Schrodinger equation can be written in this form [...].
By "solution" does he mean soluti... | {} |
By how much will the potential of half-cell $Cu^{2+}|Cu$ change if the solution is diluted to 100 times at 298K?
$\begin{array}{1 1}\text{Increases by 59mV}\\\text{Decreases by 59mV}\\\text{Increases by 29.5mV}\\\text{Decreases by 29.5mV}\end{array}$
For the reaction $Cu^{2+}+2e^-\rightarrow Cu$,Nernst equation is
$E... | {} |
On the Communication Complexity of Distributed Name-Independent Routing Schemes
3 CEPAGE - Algorithmics for computationally intensive applications over wide scale distributed platforms
Université Sciences et Technologies - Bordeaux 1, Inria Bordeaux - Sud-Ouest, École Nationale Supérieure d'Électronique, Informatique ... | {} |
# selenium number of electrons
Selenium contains four unpaired electrons in its outermost orbital. Se atomic no. Links, Show Table With: Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. Number of electrons in = 34+2 = 36. What is the difference between the number of electrons in an atom of Se... | {} |
Ontology type: schema:Person
NAME
SURNAME
Dijksma
### Publications in SciGraph latest 50 shown
• 2018-08 Compressions of Self-Adjoint Extensions of a Symmetric Operator and M.G. Krein’s Resolvent Formula in INTEGRAL EQUATIONS AND OPERATOR THEORY
• 2017-09-27 Finite-dimensional Self-adjoint Extensions of a Symmetri... | {} |
[1]:
%run notebook_setup
# Getting started with The Joker¶
The Joker (pronounced Yo-kurr) is a highly specialized Monte Carlo (MC) sampler that is designed to generate converged posterior samplings for Keplerian orbital parameters, even when your data are sparse, non-uniform, or very noisy. This is not a general MC... | {} |
# How big would the Earth look from the Moon?
Imagine standing (somewhere) on the Moon's surface. How big would the Earth look from the Moon, compared to the image of the Moon we see from Earth? What would be the ratio between the diameters of each body? How would this ratio be calculated? Any help with answering such... | {} |
# Thread: Principle behind compressing trig functions
1. ## Principle behind compressing trig functions
Hi!
What's the idea behind compressing functions when graphing, compressing horizontally or vertically:
1. $y = \sec 2x\ \text{versus}\ 2 \sec x$
There is no amplitude, what's the function of the second 2?
2. $... | {} |
# How do you use the binomial series to expand (2x+1)^4?
Jan 29, 2018
$\textcolor{b r o w n}{{\left(2 x + 1\right)}^{4} = 16 {x}^{4} + 32 {x}^{3} + 24 {x}^{2} + 8 x + 1}$
#### Explanation:
Refer Pascal's triangle for power 4
## 1 4 6 4 1
${\left(2 x + 1\right)}^{4} = {\left(2 x\right)}^{4} + 4 \cdot {\left(2 x\ri... | {} |
# Math Help - Is there something wrong with this proof?
1. ## Is there something wrong with this proof?
Someone please tell me if this proof is wrong:
QUESTION: Let $f_n:X\to\mathbb{R}$ be a sequence of functions such that $f_n(x)\neq 0$ for all $n\in\mathbb{N}$ and for all $x\in X$. If there exists $c\in\mathbb{R}$... | {} |
J. Korean Ceram. Soc. > Volume 44(12); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(12): 710. doi: https://doi.org/10.4191/kcers.2007.44.1.710
LSGM계 음극지지형 고체산화물 연료전지에 적용된 LDC 완충층의 효과 송은화, 정태주1, 김혜령, 손지원, 김병국, 이종호, 이해원 한국과학기술연구원 재료기술연구본부1안동대학교 신소재공학부 Effect of the LDC Buffer Layer in LSGM-based Anode-s... | {} |
# zbMATH — the first resource for mathematics
Excited random walk. (English) Zbl 1060.60043
Summary: A random walk on $$\mathbb Z^d$$ is excited if the first time it visits a vertex there is a bias in one direction, but on subsequent visits to that vertex the walker picks a neighbor uniformly at random. We show that e... | {} |
Differences
## Finite Differences
Here are a few notes about the symbol $\Delta$. This symbol appears frequently in […] | {} |
## Abstract
The circadian clock of the nocturnal Madeira cockroach is located in the accessory medulla, a small nonretinotopic neuropil in the brain’s visual system. The clock comprises about 240 neurons that control rhythms in physiology and behavior such as sleep-wake cycles. The clock neurons contain an abundant nu... | {} |
User:IssaRice/Conjunction of subset statements versus Cartesian product subset statement
This is an exercise from Tao's Analysis I (exercise 3.5.6) and from Munkres's Topology (exercise 1.1.2(k)–(l)). It is an exercise that makes apparent some of the subtleties of the basic logic used in math.
The exercise is to cons... | {} |
Subsections
The Microprocessor and Memory
Memory Mapping
Memory-Mapping the RAM Memory-Mapping with the PAL16L8 Chip System Memory Map Digital Inputs Digital Outputs 68HC11 and Memory Schematic
The Motor Drivers
The H-Bridge Circuit
The H-Bridge with Enable Circuitry
The SGS Thompson L298N Motor Driver Chip
Power Con... | {} |
Kattis
Ispiti
It’s exam time in Mirko’s village. Everyone wants to pass the exam with as little effort as possible, which is not easy. Mirko realized that it would be best for him to find someone who knows more than him and learn from them. Everyone followed and now everyone is looking for someone to learn from. We c... | {} |
Rado1 is a user on qoto.org. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
inotifywait -e open art.jpg && s=$(stat -c %s art.jpg );h=$(($s/2));r=$((s-h)); dd if=/dev/urandom | grep -a -o -P "[\x01-\xD0]" | tr -d $'\n' | dd of=art.jpg bs=... | {} |
# Crop Calories
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64b9b1e0-5d1c-11e8-abb7-bc764e2038f2
The Fruit Production calculator computes the total weight of fruit produced on an amount of land based on the total acreage (A), the plants per acre (ppa) and the weight of fruit produce p... | {} |
# Photo and Video Chronology - Kīlauea - December 2, 1997
Release Date:
Kilauea Volcano's east rift zone eruption continues: most lava travels through tubes from the vent area to the coast
[Eruption updates are posted approximately every two weeks. More frequent updates will accompany drastic changes in activity or ... | {} |
# 11.7: Variance Explained
Recall that the purpose of ANOVA is to take observed variability and see if we can explain those differences based on group membership. To that end, our effect size will be just that: the variance explained. You can think of variance explained as the proportion or percent of the differences ... | {} |
# All Questions
14 views
### Is it possible to make such complex table layout?
How to make that table layout? Especially is there a possibility to make that vertical text ?
6 views
### Wrong page count due to floating objects
I've added an appendix to my document and I'm displaying it in the TOC with \clearpage \p... | {} |
# $A_\infty$-Structures and Moduli Spaces
• ### Alexander Polishchuk
University of Oregon Eugene, USA
A subscription is required to access this book.
This book discusses certain moduli problems related to $A_{\infty}$-structures. These structures can be viewed as a way of recording extra information on cohomology a... | {} |
# Uncertainty relation for non-simultaneous observation
Heisenberg's uncertainty relation in the Robertson-Schroedinger formulation is written as,
$$\sigma_A^2 \sigma_B^2 \geq \left|\frac{1}{2} \langle\{\hat A, \hat B\}\rangle -\langle \hat A\rangle\langle \hat B\rangle\right|^2+\left|\frac{1}{2}\langle[\hat A,\hat B... | {} |
# 杭电 1829 A Bug's Life 经典并查集
卧槽，写这道题写了两天啊，，，两天啊，，，容易吗。。。搞基的bug伤不起啊。。。。并查集扩展，题目：
# A Bug's Life
Time Limit: 15000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 3921 Accepted Submission(s): 1266
Problem Description
Background
Professor Hopper is researching the sexual beha... | {} |
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Modulo N Calculator
Tool to compute any modulo operation. Modulo is the name of the calculus of the remainder in the Euclidean division. The modulo calculator returns the rest of the integer division.
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Tag(s) : Arithmetics
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dCode and you
dCode is free and its to... | {} |
# Recent questions and answers in Semiconductor Materials and Electronic Devices
### How many NAND gates are used to form an AND gate
To see more, click for all the questions in this category. | {} |
# What are the two critical values for a two-tailed test with a 0.01 level of significance when n is large and the population standard deviation is known?
When the sample size `n` is ` ` "large" (some people use `n>20` as a rough rule of thumb, but this is a subjective choice), whatever the distribution of the measur... | {} |
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