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# Math Help - Finding the missing factor....(help pls)
1. ## Finding the missing factor....(help pls)
1. (a2) ( ? ) = a8
2. (x4) ( ? ) = x7
3. ( ? ) (5m2) = 20m5
4. ( ? ) ( – 6a2) = 18a3
5. ( – 3a2b3) ( ? ) = – 27a6b7
Thanks!
2. Originally Posted by slykksta
1. (a2) ( ? ) = a8
2. (x4) ( ? ) = x7
3. ( ? ) (5m2... | {} |
# Logic Symbols
1. Jan 19, 2010
### Char. Limit
A lot of times, when I look at something written in logic, there are these strange symbols popping out everywhere. Examples include an upside-down A, a giant V or U, or an upside-down V.
Could you point me to an article describing what these symbols mean?
2. Jan 20, ... | {} |
1. ## Consecutive integers...
The sum of c consecutive positive integers = c^2.
Example, c=5: 3+4+5+6+7 = 25 ; 5^2 = 25
(last integer = 7)
If c = 9999, what is the last integer?
What is the last integer in terms of c?
2. ## Re: Consecutive integers...
Code:
c:=9999:
for n from 1 to 10000 do
if sum(k,k=n..n+c-1)=c^... | {} |
# Ngô Quốc Anh
## March 29, 2011
### The (original) Picone identity
Filed under: PDEs — Tags: — Ngô Quốc Anh @ 17:02
For differentiable functions $v > 0$ and $u \geqslant 0$, the following Picone’s identity is well known
$\displaystyle {\left| {\nabla u - \frac{u}{v}\nabla v} \right|^2} = {\left| {\nabla u} \right... | {} |
# How can I run .exe file in Mathematica
we have a .exe file. It takes input as .txt file and gives output as another .txt file.
Now, I want to run that .exe file from MM.
I tried in 2 way,
Case 1 :
using SystemOpen[].
It showing the following Window, Once I run the SystemOpen[path].
I click on Run button.after ... | {} |
# A simple model of boom and bust
How private sector spending behaviours drive the economy and government budget
Posted on 29 July 2017 by Andrew Berkeley
In the last two posts we developed simple models of how government money circulates in the economy. In this post, we'll experiment with some of the behaviours enc... | {} |
# Math Help - Ionization constants for acids and bases
1. ## Ionization constants for acids and bases
Is the $K_a$ value for hydrofluoric acid $3.5\times10^{-4}$ or $6.7\times10^{-4}$? I have two different textbooks for chemistry that have different values.
Ionization constants table from both textbooks:
http://img16... | {} |
## Thinking Mathematically (6th Edition)
$21$
If we want to choose $k$ elements out of $n$ disregarding the order, not allowing repetition, we can do this in $_{n}C_k=\frac{n!}{k!(n-k)!}$ ways. Hence here because we have $7$ spots for $2$ people, $_{7}C_2=\frac{7!}{2!(7-2)!}=7\cdot6/2=21$ | {} |
Reviving messageboards.
Put anything you want to ask or know in the replies. I'll try to respond ASAP.
Keep the language in English.
Have fun!
1 year, 1 month ago
This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a... | {} |
# Study of jets produced in association with a W boson in pp collisions at $\sqrt(s)$ = 7 TeV with the ATLAS detector
4 Laboratoire de Physique Corpusculaire
LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
Abstract : We report a study of final states containing a W boson and hadronic jets, produced in p... | {} |
Radioactive decay or ‘radioactivity’ is a physical process whereby certain unstable nuclei break up or decay spontaneously. Radioactivity is an energetic process.
## The Valley of Stability
In Nuclear Physics parlance, the valley of stability characterises the stability of nuclides to radioactive decay, based on the... | {} |
# GLMM overfitting solutions
in GLMM faq page http://glmm.wikidot.com/faq there is a statement about overfitting:
"One alternative (suggested by Robert LaBudde) is to "fit the model with the random factor as a fixed effect, get the level coefficients in the sum to zero form, and then compute the standard deviation of... | {} |
## Approximate Schauder Frames for Banach Sequence Spaces
Series
Dissertation Defense
Time
Friday, April 16, 2021 - 4:00pm for 1.5 hours (actually 80 minutes)
Location
ONLINE
Speaker
Yam-Sung Cheng – Georgia Institute of Technology – ycheng61@gatech.edu
Organizer
The main topics of this thesis concern two types of ap... | {} |
PERT APPROXIMATION FORMULAS (for mean and variance of activity durations)
The two statistics needed for the duration of each project activity are the mean time and the variance or standard deviation of activity duration. The mean value formula is a weighted average of the three given times where the weight on the mini... | {} |
# How to remove the fake k-points from vasprun.xml file in the calculation of HSE06 band structure?
Is there any script that can remove fake k-points from a vasprun.xml file for HSE06 band structure calculation? Because removing it manually is a time-consuming task.
• How does one actually do this task? Maybe somethi... | {} |
# Math Help - Bessel's Inequality
1. ## Bessel's Inequality
I'm having trouble with this problem. I've tried rewriting things in about every way I know how to but I haven't arrived at an answer. I'd appreciate some help.
"Let $V$ be an inner product space and let $S=\{v_1, ..., v_n\}$ be an orthonormal subset of $V$... | {} |
### Methods Bites
Blog of the MZES Social Science Data Lab
### How to write your own R package and publish it on CRAN
R is a great resource for data management, statistics, analysis, and visualization — and it becomes better every day. This is to a large part because of the active community that continuously creates... | {} |
# A question regarding Y=B+S by a nuclear physics toddler
1. May 7, 2014
### rpndixit5
If Q=e[I+0.5Y] and Y=B+S. What is the Q/e and S value for ρ and k mesons, Ω and Δ baryons?
I means third component of isospin and Y,B,S,Q,e have usual meanings?
This is the question. I don't even know what these symbol means. Can... | {} |
# Neumann Boundary with ADI-method (FDM); how do I implement this?
I am modelling the Heat equation in 2D in Python. I am using finite difference methods, more specifically the Alternating Direction Implicit method. The model works quite well with Dirichlet boundary conditions, but I can't figure out how to implement ... | {} |
# Routine Apache Server Update Today
One fact which I mention often, is that I use my home computer, which I name ‘Phoenix’, as a Web-server, and as the hosting server for this blog.
For any readers who have questions on how this is possible, I’d direct you Here.
Updates which are somewhat remarkable, such as an act... | {} |
Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10th
# The standard deviation and coefficient of variation of a data are 1.2 and 25.6 respectively. Find the value of mean. - Mathematics
Sum
The standard deviation and coefficient of variation of a data are 1.2 and 25.6 respectively. Find the value ... | {} |
# Calculate: x^4-10x^2+9=0
## Expression: ${x}^{4}-10{x}^{2}+9=0$
Transform the biquadratic equation into a quadratic equation by substituting $t$ for ${x}^{2}$
${t}^{2}-10t+9=0$
Solve the equation for $t$
$\begin{array} { l }t=1,\\t=9\end{array}$
Substitute back $t={x}^{2}$
$\begin{array} { l }{x}^{2}=1,\\{x}^{... | {} |
ADMMConsensus specialises ADMM for solving optimisation problems of the form
$\mathrm{argmin}_{\mathbf{x}} \; \sum_{i = 0}^{N_b - 1} f_i(\mathbf{x}) + g(\mathbf{x})$
via an ADMM problem of the form
$\begin{split}\mathrm{argmin}_{\mathbf{x}_i,\mathbf{y}} \; \sum_{i = 0}^{N_b - 1} f(\mathbf{x}_i) + g(\mathbf{y}) \;\ma... | {} |
### Session H37: SPS Undergraduate Research III
8:00 AM–11:00 AM, Tuesday, February 28, 2012
Room: 108
Chair: Gary White, AIP/SPS
Abstract ID: BAPS.2012.MAR.H37.6
### Abstract: H37.00006 : Scanning Tunneling Microscopy of Fe Doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$
9:00 AM–9:12 AM
Preview Abstract MathJax On | Off A... | {} |
# afro-xlmr-large
AfroXLMR-large was created by MLM adaptation of XLM-R-large model on 17 African languages (Afrikaans, Amharic, Hausa, Igbo, Malagasy, Chichewa, Oromo, Nigerian-Pidgin, Kinyarwanda, Kirundi, Shona, Somali, Sesotho, Swahili, isiXhosa, Yoruba, and isiZulu) covering the major African language families an... | {} |
# potfit wiki
open source force-matching
### Sidebar
User Guide
Examples
Potential Databases
More
output:main
# Output
potfit prints information on the minimization progress to the standard output. Additionally all input and output file names are also written to standard output.
The output of the optimization... | {} |
Abstract
A method that estimates invisible cracks from the surface based on the surface deformation measured by digital image correlation (DIC) is being developed. An inverse problem is setup to estimate such invisible cracks from the surface deformation. Surface deformation, measured by the DIC method, contains noise... | {} |
## 16/07/2010, Friday, 10:00–11:00
Yasuyoshi Yonezawa, Univ. of the Algarve and IST
Quantum $\left({\mathrm{sl}}_{n},\wedge {V}_{n}\right)$ link invariant and matrix factorizations.
M. Khovanov and L. Rozansky constructed a homology for a link diagram whose Euler characteristic is the quantum link invariant associate... | {} |
# Beamer: Strange spacing in references with biblatex apa-style
I stumbled upon these two spacing errors (marked with red numbers):
I guess the first space is not really an error, but simply English spacing (\nonfrenchspacing). Can it be turned off (without changing the language)? \frenchspacing does not seem to have... | {} |
How do you write y+2= -3/4(x+1) in standard form?
Apr 22, 2018
$3 x + 4 y = - 11$
Explanation:
Given:
$y + 2 = - \frac{3}{4} \left(x + 1\right)$
The standard form for a linear equation is:
$A x + B y = C$
To convert $y + 2 = - \frac{3}{4} \left(x + 1\right)$ into standard form, first distribute the slope $- \fr... | {} |
# Statistics
Statistics is a branch of mathematics dealing with data collection, organization, analysis, interpretation and presentation.[1][2] In applying statistics to, for example, a scientific, industrial, or social problem, it is conventional to begin with a statistical population or a statistical model process t... | {} |
homechevron_rightProfessionalchevron_rightStatistics
# Estimated Mean of a Population
This online calculator allows you to estimate mean of a population using given sample
Let's suppose you have number of values, randomly drawn from some source population (these values are usually referred to as a sample). For given... | {} |
# Probability of Randomly Selective Event, Conditional Probability
Tags:
1. Jan 27, 2015
### conniebear14
1. The problem statement, all variables and given/known data
A company has been running a television advertisement for one of its new products. A survey was conducted. Based on its results, it was concluded tha... | {} |
## Algebra 1
Published by Prentice Hall
# Chapter 8 - Polynomials and Factoring - 8-8 Factoring by Grouping - Standardized Test Prep - Page 521: 51
#### Answer
5r(r+3)($2r^{2}$+1)
#### Work Step by Step
Given the polynomial $10r^{4}$ + $30r^{3}$ + $5r^{2}$ + 15r We see that the terms have a common factor of 5r so... | {} |
## Saturday, October 31, 2009 ... /////
### Lord Monckton on Glenn Beck show
If you have a spare hour, here is the program:
It has 7 parts - you can choose them via the "tape" button next to "play" per 8 minutes or so. John Bolton is there, too. They discuss many details about the legal power of the possible Copenha... | {} |
# Chord BC
A circle k has the center at the point S = [0; 0]. Point A = [40; 30] lies on the circle k. How long is the chord BC if the center P of this chord has the coordinates: [- 14; 0]?
Correct result:
x = 96
#### Solution:
$r=\sqrt{ (40-0)^2+(30-0)^2 }=50 \ \\ x_{0}=|-14|=14 \ \\ \ \\ (x/2)^2 +x_{0}^2=r^2 \ ... | {} |
ColdFusion's cfquery failing silently
I have a query that retrieves a large amount of data.
<cfsetting requesttimeout="9999999" >
<cfquery name="randomething" datasource="ds" timeout="9999999" >
SELECT
col1,
col2
FROM
table
</cfquery>
<cfdump var="#randomething.recordCount#" /> <!---should be about 5 million rows -... | {} |
## Codility Ferrum 2018 Challenge
This post isn’t really on topic, but anyone with a general interest in algorithms might find it useful.
The following is my entry for Codility’s LongestNonNegativeSumSlice challenge. The temporal and spatial complexity are both O(N). The solution uses a combination of dynamic progra... | {} |
# How does the lack of partitions of unity affect the structure of analytic/holomorphic manifolds?
The standard way to define integration on a smooth manifold is to use partitions of unity, to extend to the case where the form you're integrating isn't supported on just one coordinate patch. Of course, in the analytic/... | {} |
This article will focus on Hamming codes - mainly, this represents an attempt to explain a little bit better how this method can help in detecting and correcting1 bit errors.
This method is not really useful at “higher level” - just because the data we work with is either 100% correct or has way more than 1 bit corrup... | {} |
# How does a TI-84 calculate the derivative at a point?
Google has failed me. Any responses are greatly appreciated.
I don't have it with me right now but I think it reads 10^-15 as zero, so the easiest way would be approximate it with the interval x,x+10^-14 where x is the point. It is optional in the nDeriv functio... | {} |
## FANDOM
155 Pages
Magnetic turbulent diffusion occurs when a charged particle moves through a region where the magnetic field changes with position. We will assume Kolmogorov spectrum for the magnetic field. Since the energy density is quadratic in both the velocity and the magnetic field, they have the same spectr... | {} |
# October 2018 Archives
## New Directions Of Interpolation
We have spent a few months looking at how we might interpolate between sets of points (xi, yi), where the xi are known as nodes and the yi as values, to approximate values of y for values of x between the nodes, either by connecting them with straight lines o... | {} |
# Prove that this fraction is irreducible:
0 like 0 dislike
6 views
Prove that this fraction is irreducible:
$$\frac{21n + 4}{14n +3}$$ | {} |
# Tail Calls
Consider the factorial function below:
When we make the call fac(3), two recursive calls are made: fac(2, 3) and fac(1, 6). The last call returns 6, then fac(2, 3) returns 6, and finally the original call returns 6. I would recommend looking at the execution in Python Tutor:
If you look carefully, you c... | {} |
How to get header and footer over ToC, LoF and Nomeclature?
I would like to know how we include header and footer over Table of Contents, List of Figures and Nomenclature? Do we need to renew any command? or any package is used to do that? Sample script would be helpful. I also want to get rid of page count on nomencl... | {} |
Home » » In which of the following systems is the power of the component units more than ...
# In which of the following systems is the power of the component units more than ...
### Question
In which of the following systems is the power of the component units more than that of the central government?
### Options
... | {} |
# What's the difference between speed and velocity?
Speed is the ratio of distance traveled to the time elapsed.
i.e. speed = distance/time
whereas, velocity is the ratio of displacement to the time elapsed.
i.e., velocity = displacement/time
Now, displacement can be 0, but distance traveled cannot be. Think about... | {} |
# How to calculate quartiles and other percentiles?
Given the following data:
972, 975, 985, 993, 993, 995, 998, 1001, 1004, 1007, 1008, 1009, 1011, 1015, 1016, 1020, 1022, 1032
I calculate the lower quartile as follows:
Number of values: 18, Number of 'gaps': 17.
Lower quartile is at 17/4 + 1 = 5.25th value. 5.25... | {} |
Potentiometric Titration of Hydrogen Peroxide (Buret) One method of determining the concentration of a hydrogen peroxide, H 2 O 2, solution is by titration with a solution of potassium permanganate, KMnO 4, of known concentration. In laboratories, 30 percent hydrogen peroxide is used. Importance of PbS and H 2 O 2 reac... | {} |
FutureStarr
11 8 As a Percent
## 11 8 As a Percent
8, as a single digit, is 11 as a percent, meaning this percentage is 86. Or, 3,333 as an integer, which is the base value divided by 100 and multiplied by 11.
### Percent
via GIPHY
A mixed number is a whole number plus a fraction. You can convert fraction part of... | {} |
Chemistry » States of Matter » Ideal Gas Laws
# Ideal Gas Laws
## Ideal gas laws
There are several laws to explain the behaviour of ideal gases. The first three that we will look at apply under very strict conditions. These laws are then combined to form the general gas equation and the ideal gas equation.
Before w... | {} |
# Generalized Dirichlet-process-means for $f$-separable distortion measures
31 Jan 2019
DP-means clustering was obtained as an extension of $K$-means clustering. While it is implemented with a simple and efficient algorithm, it can estimate the number of clusters simultaneously... (read more)
PDF Abstract
# Code Ad... | {} |
## Notes for Stochastic Control 2019
The link below contains notes PDF for this years stochastic control course
stochastic_control_2019
I’ll upload individual posts for each section. I’ll likely update these notes and add more exercises over the coming semester. I’ll add this update in a further post at the end of t... | {} |
# NAG Library Routine Document
## 1Purpose
g05sff generates a vector of pseudorandom numbers from a (negative) exponential distribution with mean $a$.
## 2Specification
Fortran Interface
Subroutine g05sff ( n, a, x,
Integer, Intent (In) :: n Integer, Intent (Inout) :: state(*), ifail Real (Kind=nag_wp), Intent (I... | {} |
# Curvature tensor of sphere radius R
#### player1_1_1
hello! I need to find curvature tensor of sphere of R radius. How can I start? thanks!
Related Differential Geometry News on Phys.org
hello
#### HallsofIvy
Homework Helper
Are you talking about the sphere of radius R in three dimensions?
Start by writing out... | {} |
Milkweed plants are the one food on which monarch caterpillars dine. {�h�r�������ȘAԹ'��$D~�F�ðc��u�+f�Z��w\rm�]LM�|��L����R�E'6 �s5X�\r�$�Y�:Oq,�L��{�U���\\۳�k�)/PageUIDList<0 4896>>/PageWidthList<0 612.0>>>>>>/Resources<>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/StructParents 0/T... | {} |
GMAT Question of the Day - Daily to your Mailbox; hard ones only
It is currently 14 Dec 2018, 09:09
### 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.
Customize... | {} |
Seminars/Colloquia
Jet cross sections at high-energy colliders exhibit intricate patterns of logarithmically enhanced higher-order corrections. In particular, so-called non-global logarithms emerge from soft radiation emitted off energetic partons inside jets. While this is a single-logarithmic effect at lepton collid... | {} |
# Boolean function
Boolean function
In mathematics, a (finitary) Boolean function is a function of the form f : B"k" → B, where B = {0, 1} is a "Boolean domain" and "k" is a nonnegative integer called the arity of the function. In the case where "k" = 0, the "function" is essentially a constant element of B.
... | {} |
# ROCOF¶
class reliability.Repairable_systems.ROCOF(times_between_failures=None, failure_times=None, CI=0.95, test_end=None, show_plot=True, print_results=True, **kwargs)
Uses the failure times or failure interarrival times to determine if there is a trend in those times. The test for statistical significance is the ... | {} |
3 Tutor System
Starting just at 265/hour
# In the figure, ABC and AMP are two right triangles, right angled at B and M respectively, prove that: (i) $$\triangle$$ ABC ~ $$\triangle$$ AMP (ii) CA/PA = BC/MP
Given, ABC and AMP are two right triangles, right angled at B and M respectively.
(i) In $$\triangle$$ ABC and ... | {} |
## The ECH capacities of a ball union a cylinder
[UPDATE 2: I corrected some small mistakes pointed out by Vinicius. I’ll write a detailed explanation of the index calculation in another post.]
Recall that if $\Omega$ is a domain in the first quadrant in ${\mathbb R}^2$, then we define the “toric domain”
$X_\Omega =... | {} |
## Access
You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
## If You Use a Screen Reader
This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, pl... | {} |
# menpofit.io¶
If you make use of one of menpofit’s pre-trained models, you will find that the type that is provided to you is the PickleWrappedFitter. See it’s documentation to understand it’s purpose and how you can effectively use it. | {} |
# Tag Info
2
You can do this using the atbegshi package, together with an \if... statement where you set the \if... equal to true at the start of the option and then to false at the end using \setlist. Here's a MWE. I have used the same continuation message that you used above. \documentclass{book} \usepackage{enumit... | {} |
## Touching pennies
Stump your fellow simians.
ceptimus
Posts: 1464
Joined: Wed Jun 02, 2004 11:04 pm
Location: UK
### Touching pennies
How many pennies can be arranged so that each penny touches every other penny. Don't just give a number; a description and/or diagram is required.
Grammatron
Posts: 37447
Joined: Tu... | {} |
9 out of 10 based on 318 ratings. 1,850 user reviews.
# AN INTRODUCTION TO FOURIER SERIES AND INTEGRALS ROBERT T SEELEY
An Introduction to Fourier Series and Integrals.A compact,sophomore-to-senior-level guide,Dr. Seeley's text introduces Fourier series in the way that Joseph Fourier himself used them: as solutions o... | {} |
# chebyshevT
Chebyshev polynomials of the first kind
## Description
example
chebyshevT(n,x) represents the nth degree Chebyshev polynomial of the first kind at the point x.
## Examples
### First Five Chebyshev Polynomials of the First Kind
Find the first five Chebyshev polynomials of the first kind for the varia... | {} |
# 6.2: Berger v. NY 388 US 41 (1967)
## U.S. Supreme Court
### Berger v. New York, 388 U.S. 41 (1967)
Berger v. New York
No. 615
Argued April 13, 1967
Decided June 12, 1967
388 U.S. 41
CERTIORARI TO THE COURT OF APPEALS OF NEW YORK
Syllabus
Petitioner was indicted and convicted of conspiracy to bribe the Cha... | {} |
# [texhax] problematic slide with beamer
Sat Oct 1 11:39:44 CEST 2005
Christopher W. Ryan :
> I've wracked my brain trying to troubleshoot this presentation, without
> succes. I wonder if anyone can find the error(s) that I can't.
>
> This is on frame of about 30 in my presentation. I'm using beamer. I've
> tried ... | {} |
Trigonometrytriangle ratio question
DeusAbscondus
Active member
(Plse bear with me: until i learn how to fly this thing, / must stand for radical)
If the side ratio for a 30:40:90 deg right triangle are 1 : /3 : 2
then, is the following true:
one may multiply this ratio by 1,2,3 or 5,6,7,8,9 or 10 and the pythagore... | {} |
# Homework Help: Second partial derivative wrt x
1. Jul 15, 2014
### jonroberts74
I just need some clarification that this is fine
so I have
$$f_{x} = -2xe^{-x^2-y^2}cos(xy) -ysin(xy)e^{-x^2-y^2}$$
now, taking the second derivative
$$f_{xx} = [-2xe^{-x^2-y^2}+4x^2e^{-x^2-y^2}]cos(xy) - ysin(xy)[-2xe^{-x^2-y^2}]+... | {} |
# Clearcase snapshot view path's not resolving when comparing
We use Clearcase at my work and I have several snapshot views setup (on Windows XP). The views themselves seem to work great, however whenever I try to compare any versions of any elements from my snapshot view, I have problems with my diff tool (currently ... | {} |
# Auditing
HDS welcomes members of the public to audit courses. In order to audit a course, one must:
1. Obtain the course instructor's permission, to be confirmed to the HDS registrar via the professor’s signature or email.
2. Fill out an audit application at the Office of the Registrar (application fee of $50; chec... | {} |
# Find conformal mapping from sector to unit disc
Find a conformal mapping between the sector $\{z\in\mathbb{C} : -\pi/4<\arg(z) <\pi/4\}$ and the open unit disc $D$.
I know that it should be a Möbius transformation, but other than that I am very stuck, any help would be much appreciated.
-
Remember that Mobius tran... | {} |
2-Dimensional Geometries
In General > s.a. 2D gravity; 2D manifolds; Geometric Topology.
* Result: All metrics are conformally flat, i.e., they can be locally written as
ds2 = ± Ω2(α, β) (dα2 ± dβ2) ,
where α and β are conjugate harmonic coordinates.
* Riemannian: There are 3 different kinds of geometry; Given any c... | {} |
# Recommendation System in R
#### by yhat
##### June 19, 2013
Recommender systems are used to predict the best products to offer to customers. These babies have become extremely popular in virtually every single industry, helping customers find products they'll like. Most people are familiar with the idea, but nearl... | {} |
This is an archived post. You won't be able to vote or comment.
[–] 25 points26 points (0 children)
If I were writing games for the Atari 2600, this would be hella useful.
[–] 2 points3 points (4 children)
first saw this trick years back in an O'Reilly C++ book but never quite understood why it worked, it's good ... | {} |
## Cryptology ePrint Archive: Report 2016/664
Efficient Conversion Method from Arithmetic to Boolean Masking in Constrained Devices
Yoo-Seung Won and Dong-Guk Han
Abstract: A common technique employed for preventing a side channel analysis is boolean masking. However, the application of this scheme is not so straigh... | {} |
• Subject:
...
• Topic:
...
A body of mass 5 kg starts from the origin with an initial velocity $\stackrel{\to }{u\text{\hspace{0.17em}}}\text{\hspace{0.17em}}=\text{\hspace{0.17em}}30\stackrel{^}{i}+40\stackrel{^}{j}\text{\hspace{0.17em}}m{s}^{-1}$. If a constant force $\stackrel{\to }{F\text{\hspace{0.17em}}}=-\l... | {} |
# Arithmetic Associativity – Not So Fast
Arithmetic is associative, right? Well, in the world of paper and pencil, where you can often do calculations exactly, that can be true. However, in the computing world, where real numbers can't always be represented exactly because of working with finite precision datatypes, i... | {} |
# Evaluate the integral after figuring out the proper method to use
1. Dec 4, 2012
### Painguy
1. The problem statement, all variables and given/known data
∫ ((2t+3)^2)/t^2 dt
2. Relevant equations
3. The attempt at a solution
I figured that I would use integration by parts. The problem I'm having is that we haven... | {} |
# node-gyp
node-gyp is a cross-platform command-line tool written in Node.js for compiling native addon modules for Node.js. It bundles the gyp project used by the Chromium team and takes away the pain of dealing with the various differences in build platforms. It is the replacement to the node-waf program which is re... | {} |
# 0.2 Practice tests (1-4) and final exams (Page 22/36)
Page 22 / 36
8 . The 99% confidence interval, because it includes all but one percent of the distribution. The 95% confidence interval will be narrower, because it excludes five percent of the distribution.
## 8.2: confidence interval, single population mean,... | {} |
# ## Difference of Squares
The difference of squares formula is a shortcut that you can use anytime you need to factor an expression that has a perfect square subtracted from another perfect square.
## How to Factor a Difference of Squares
1. Make sure the polynomial is a difference of squares.
• Does the polynomial... | {} |
Counting Factors
Is there an efficient way to work out how many factors a large number has?
Summing Consecutive Numbers
15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?
Oh! Hidden Inside?
Find the number which has 8 divisors, such that th... | {} |
# Professor Roger William Lewis Jones MA(Oxon), PhD(Bham), CPhys, FInstP
## Research Interests
My research interests are in experimental elementary (high-energy) particle physics. They are divided into three activities:
• The physics of particles containing b-quarks using the ATLAS experiment at CERN.
• The investig... | {} |
# Difference between revisions of "Illumination problem"
The problem of determining the minimum number of directions of pencils of parallel rays, or number of sources, illuminating the whole boundary of a convex body. Let $K$ be a convex body in an $n$- dimensional linear space $\mathbf R ^ {n}$, let $\mathop{\rm bd} ... | {} |
# Small ball Gaussian probabilities with moving center
I would like to prove (if possible, otherwise find a counterexample for) the following lemma:
Let $$(X,\|\cdot \|_X)$$ be a separable Banach space. Additionally, we have a centred Gaussian measure $$\mu$$ on $$X$$, with Cameron--Martin space $$(E, |\cdot |_E)$$.
... | {} |
Warning
This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.
# Reciprocity¶
Algorithms to calculate reciprocity in a directed graph.
reciprocity(G[, nodes]) Compute the reciprocity in a directed graph. overall_reciprocity(G) Compute ... | {} |
Geometrisation of Chaplygin’s reducing multiplier theorem
Geometrisation of Chaplygin’s reducing multiplier theorem
A V Bolsinov, A V Borisov, I S Mamaev Dept. of Mathematical Sciences, Loughborough University, Loughborough,
LE11 3TU, UK
Udmurt State University, Izhevsk, Russia A. A. Blagonravov Mechanical Engineerin... | {} |
The River Press (Fort Benton, Mont.) 1880-current, September 25, 1889, Image 1
What is this? Optical character recognition (OCR) is an automated process that converts a digital image containing numbers and letters into computer-readable numbers and letters. The search engine used on this web site searches OCR-generate... | {} |
# File-specific TeX compiling options?
I have TeX files that Aquamacs compiles by default with pdflatex and other files compiled by default with latex (so I get a dvi).
If I make a copy of file that Aquamacs compiles with latex, that copy is compiled with latex. Similarly, a copy of a "pdflatex file" will be compiled... | {} |
# Series n sequences
## Recommended Posts
Ok, i got a couple of probs. how do i prove if a series is divergent or convergent? and what is the nth term test? can someone please explain it to me?
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I don't know what the n'th term test is, but I suspect it's got something to do with the ratio ... | {} |
# Diffraction limited donuts & stimulated emission
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We can write an approximate analytic expression for the Airy disk, i.e. the intensity of a Fraunhofer diffraction pattern of a circular aperture, as: $I(\theta) = I_0 (\frac{2 J_1}{x})^2$, where $I_0$ is the peak intensity of the Airy d... | {} |
2. Economics
3. coase theorem question specifically e amp f suppose that a...
# Question: coase theorem question specifically e amp f suppose that a...
###### Question details
Coase theorem question. Specifically e & f
Suppose that a rancher is raising cattle (X) next to a farmer. The profits of the rancher are giv... | {} |
# (32) Draping an image over topography¶
In some cases, it is nice to “drape” an arbitrary image over a topographic map. We have already seen how to use image to plot an image anywhere in out plot. But here are aim is different, we want to manipulate an image to shade it and plot it in 3-D over topography. This exampl... | {} |
# Math Help - [SOLVED] Please find the mistake
1. ## [SOLVED] Please find the mistake
I have to find the particular solution of the following DE.
$D^2 - 3D + 2 = sinx$
Here is how I did it.
$\frac{sinx}{D^2-3D+2}$
$\frac{Im(e^{ix})}{D^2-3D+2}$
$\frac{cosx + isinx}{(i)^2 -3(i) +2}$
$\frac{cosx + isinx}{1-3i}$
T... | {} |
## Thinking Mathematically (6th Edition)
The remaining piece of the board is 1 foot 4$\frac{7}{16}$ inches long. This could also be written as 16$\frac{7}{16}$ inches long.
The longer board is 2 feet long. Using the fact that 12 inches = 1 foot, we know that the longer board is 24 inches long (24 inches = 2 feet). A 7... | {} |
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