arxiv_id stringlengths 0 16 | text stringlengths 10 1.65M |
|---|---|
# Overlapping TikZ nodes to look as a tape strip
Friends, I need to highlight specific letters. My set contains only A, N, C, Q and P, so I decided to make them look as a tape strip (ressembles a good old Turing Machine tape). The following code poorly tries to achieve that. Since I had an immutable set of letters and... | |
Homework Help: How to find the distance of a satellite with respect to the moon
1. Oct 9, 2011
starplaya
1. The problem statement, all variables and given/known data
How far above the surface of the moon should a satellite be placed so that it is stationary with respect tot the moons surface.
Radius of moon = 1737.... | |
# Revision history [back]
A better data structure than lists to make intersectoins is set, so you can first transform your list of lists into a list of sets:
sage: Lset = [set(l) for l in L]
sage: Lset
[{'B', 'C', 'D', 'E'},
{'A', 'C', 'D'},
{'A', 'B', 'D', 'E'},
{'A', 'B', 'C', 'D'}]
sage: s = Lset.pop()
Now you ... | |
## Precalculus (6th Edition) Blitzer
\begin{align} \left[ \begin{matrix} 0 & \frac{3}{2} & \frac{3}{2} & \frac{1}{2} & \frac{1}{2} & 0 \\ 2 & 2 & \frac{5}{2} & \frac{5}{2} & \frac{9}{2} & \frac{9}{2} \\ \end{matrix} \right] \end{align} The graph is shown below:
To reduce the perimeter of the graph above to half, we wi... | |
# Is it valid to get better performance in logistic regression using only a subset of the coefficients?
I have an imbalanced data set containing 12% of the positive class 88% negative. First, I ran a logistic regression with all my coefficients and got an average accuracy of 0.91 (I know that's not quite good given my... | |
# tidyquant
The tidyquant package integrates the best resources for collecting and analyzing financial data, zoo, xts, quantmod, TTR, and PerformanceAnalytics, with the tidy data infrastructure of the tidyverse allowing for seamless interaction between each. You can now perform complete financial analyses in the tidyv... | |
# American Institute of Mathematical Sciences
• Previous Article
Vector fields with distributions and invariants of ODEs
• JGM Home
• This Issue
• Next Article
Continuous and discrete embedded optimal control problems and their application to the analysis of Clebsch optimal control problems and mechanical systems
Marc... | |
# All Questions
7 views
### 2D Helmholtz equation on rectangular domain
What are some hints to solve (analytically) this equation: $$\frac{\partial^2}{\partial x^2}u(x,y) + \frac{\partial^2}{\partial y^2}u(x,y) =a^2 u(x,y)+bx+cy+d$$ on the ...
12 views
### Compact factors of Lie groups; possibly varying definitions... | |
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
I like word clouds because they are visually appealing and provide a ton of information in a small space. Ever since I saw Drew Conway’s post (LINK) I have been looking for ways to improve word clouds. One of the nice featur... | |
# Ecobee launches a new thermostat with location-detection as its killer app
Ecobee, the Canadian company that has been making connected thermostats since 2007, has released a new thermostat that combines many of the features I think a smart home should have. the thermostat, which costs $249, is a marked change in des... | |
# How can I find out what row and column a cell resides in when I populate a matrix diagonally?
I am populating a matrix diagonally. Check out these three examples for clarification:
1 2 4 7 11 16
3 5 8 12 17 22
6 9 13 18 23 27
10 14 19 24 28 31
15 20 25 29 32 34
21 26 30 33 35 36
1 2 4 7 11 16 22 28
3 ... | |
1 like 0 dislike
31 views
Please assist to solve x i details
| 31 views
0 like 0 dislike
$x=2$ or $x=-2$
Explanation:
$(3x -6) (x+2) =0$
In math if $a \times b =0$ the either $a=0$ or $b=0$, so taking $3x-6$ as $a$ and $x+2$ as $b$ we know that
$3x-6=0$ or $x+2=0$
$3x=6$ or $x=-2$
i.e. $x=2$ or $x=-2$
by Diam... | |
Elliptic Cylindrical Coordinates
1. Jun 20, 2009
nassboy
Is there a cylindrical coordinate system that is centered about the foci of an ellipse. It would include (r,theta,z) just like cylindrical coordinates only for an ellipse.
If this coordinate system exists, what is the laplacian?
Chris
2. Jun 20, 2009
Civil... | |
Categories
# Area of the Trapezoid | AMC 8, 2002 | Problem 20
Try this beautiful problem from AMC-8, 2002, (Problem-20) based on area of Trapezoid.You may use sequential hints to solve the problem.
Try this beautiful problem from Geometry based on Area of Trapezoid.
## Area of the Trapezoid – AMC- 8, 2002 – Problem... | |
# How do you find the slope of the following line, x+2y= -2?
Apr 1, 2015
I would rearrange the equation to actually "see" the slope, as:
$2 y = - x - 2$
$y = - \frac{x}{2} - \frac{2}{2}$
$y = - \frac{1}{2} x - 1$
The slope is the numerical coefficient in front of your $x$, i.e., $- \frac{1}{2}$
Apr 1, 2015
If you r... | |
Question
# Mark the correct alternative of the following.If the number 2345 a 60b is exactly divisible by 3 and 5, then the maximum value of $a+b$is?(a) 12(b) 13(c) 14(d) 15
Hint: We can use the divisibility rule for the numbers 3 and 5 to solve this question. In the case of number 5, the value of b can only be eithe... | |
## Textbooks & Solution Manuals
Find the Source, Textbook, Solution Manual that you are looking for in 1 click.
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## Holooly Tables
All the data tables that you may search for.
## Holooly Help Desk
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# Tag Info
1
divide the interval [0,1] to N subintervals and take the function $F_N$ as below: in odd subintervals equal 1 in even subintervals equal 0
2
First, $A\subset l^2$ is the collection of sequences that only take finitely many values, their entries are all zero after some point (you said constant, but the ... | |
# Ubuntu – How to “redecorate” windows
lxde
I right clicked the title bar of rhythmbox and "un/Decorate". Now the title bar is gone. I want it back and I can't figure out how. I tried hitting D but nothing happens.
• Strangely, by default, there is no toggle to decorate/undecorate a window.
You need do one of two t... | |
# MathSciDoc: An Archive for Mathematician ∫
#### mathscidoc:1702.01016
The finite subgroups of $GL_4(\bm{Z})$ are classified up to conjugation in \cite{BBNWZ}; in particular, there exist $710$ non-conjugate finite groups in $GL_4(\bm{Z})$. Each finite group $G$ of $GL_4(\bm{Z})$ acts naturally on $\bm{Z}^{\oplus 4}$... | |
## Sunday, January 23, 2011
### A visit to 'Mos Espa' on 'Tatooine'
With Tunisia in the news I was reminded of a trip I made there two years ago to visit the desert. As part of the trip I made a side excursion to see part of the set of Star Wars Episode 1: The Phantom Menace. In the film a large part of the action ta... | |
# 15.3 verify that dim(NS(A)) + Rank(A) = 5
#### karush
##### Well-known member
15.3 For the matrix
$$A=\begin{bmatrix} 1 & 0 &0 & 4 &5\\ 0 & 1 & 0 & 3 &2\\ 0 & 0 & 1 & 3 &2\\ 0 & 0 & 0 & 0 &0 \end{bmatrix}$$
(a)find a basis for RS(A) and dim(RS(A)).
ok I am assuming that since this is already in row echelon form, it... | |
# Printing a nested data structure in Clojure
I wrote the following code which transforms a nested data structure
(def board [[{:mine true} {:warn 1 :explored true} {:explored true}]
[{:warn 1 :explored true} {:warn 1 :explored true} {} ]
[{} {} {... | |
Chapter 200
### Definition and Etiology
Coccidioidomycosis, commonly known as Valley Fever, is caused by dimorphic soil-dwelling fungi of the genus Coccidioides. Genetic analysis has demonstrated the existence of two species, C. immitis and C. posadasii. These species are indistinguishable with regard to the clinical... | |
# Explain why the chain rule is needed to find derivatives if $y$ is a function of $x$?
I know that if $y$ is a function of $x$, or $y=f(x)$, you need to use the chain rule to find it's derivative.
Let's say I want to find the derivative of $y^2$ and $y$ is a function of $x$. Therefore, I would need to use the chain ... | |
# Random Wits
Life is too short for a diary
## Random
\$ random stuff ├── tags ├── bookshelf ├── resources ├── quotes ├── habits └── about me
+ say Hello
Mon 31 May 2021
### Dear Vishi, what's a carcinogen?
If you are not living under a cave, you probably have already heard about carcinoge... | |
### Conditionals in Homomorphic Encryption and Machine Learning Applications
Diego Chialva and Ann Dooms
##### Abstract
Homomorphic encryption has the purpose to allow computations on encrypted data, without the need for decryption other than that of the final result. This could provide an elegant solution to the pr... | |
Libby estimated that the steady-state radioactivity concentration of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram.
This process begins when an organism is no longer able to exchange Carbon with their environment.
Carbon-14 is first formed when cosmic rays in the atmosphere allow ... | |
I would like to generate a random vector in which its elements are between 0 and 1 (including 0 and 1). As far as I know, v = random_matrix(ZZ, 1, 10) is a way to generate a random matrix. How would I restrict the elements to the range I want? | |
To install click the Add extension button. That's it.
The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.
4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Gri... | |
# How to draw arrows on each arc and line in \path?
When I draw paths:
\path [draw=blue]
(0,0)
arc(-60:60:1.732)
arc(120:240:1.732);
I want to add an arrow in the middle of each arc within this \path.
Like this:
I have tried the "show path construction" (curveto code) style in the package decorations.pathreplaci... | |
# Computation with arrays of numbers
My code is
m = RandomVariate[NormalDistribution[], 100];
c = 0.1;
f1 = RandomVariate[NormalDistribution[], 100];
F = Sqrt[c]*m + Sqrt[1 - c]*f1;
I would like to calculate F in the first step with the first element of m and the first element of f1; in the second step with the sec... | |
# Find Mass given half life
Noreturn
## Homework Statement
http://d2vlcm61l7u1fs.cloudfront.net/media/f62/f62b6919-e60f-405b-81fb-2323ceeb03ee/phpsL4bVl.png
## Homework Equations
So I need that in micrograms tho. So 4402*10^-18/1000=4.4*10^-18kg. or 4.4*10^-12 micrograms
that stills say it's wrong tho.
#### Atta... | |
effective molarity (effective concentration)
https://doi.org/10.1351/goldbook.E01896
The ratio of the first-order @[email protected] of an @[email protected] reaction involving two functional groups within the same @[email protected] to the second-order @[email protected] of an analogous @[email protected] @[email pro... | |
## Linear congruence
Hi all.
Can someone please tell me what is going wrong here.
Solve
$$12x \equiv 1(mod5)$$
$$gcd(12,5) = 1$$
By Euclid's Algorithm =>
$$1 = 5.5 - 2.12$$
So r is 5 in this case.
$$x = r ( \frac{b}{d} )$$
Where b is 1 and d = gcd(12,5) = 1
$$x = 5 ( \frac{1}{1} )$$
$$x = 5$$
Ok fair enough ... | |
# Optimal Polynomial Approximation
Created 2022-03-13, Edited 2022-07-20
An introduction to linear algebra and least squares on functions
## Prerequisites
• Know what an integral represents
• Know about taylor series for approximating functions
• Sufficient mathematical maturity
## Introduction
If you're confused ... | |
# Non-existence of a certain continuous function
Prove that $\not \exists$ a function $f: \mathbb{C} \to \mathbb{C}$ such that $f$ is continuous on $0< |z| < 1$ and satisfies the property: $(f(z))^n = z \$ for $n > 1$.
Comment: I am assuming this requires contradiction. But I am failing to find the contradictory poin... | |
# Algorithm for directly finding the leading eigenvector of an irreducible matrix
According to the Perron-Frobenius theorem, a real matrix with only positive entries (or one with non-negative entries with a property called irreducibility) will have a unique eigenvector that contains only positive entries. Its correspo... | |
# 005 Sample Final A, Question 13
Question Give the exact value of the following if its defined, otherwise, write undefined.
${\displaystyle (a)\sin ^{-1}(2)\qquad \qquad (b)\sin \left({\frac {-32\pi }{3}}\right)\qquad \qquad (c)\sec \left({\frac {-17\pi }{6}}\right)}$
Foundations:
1) What is the domain of ${\display... | |
# Powers of Ten
In this powers of ten learning exercise, 5th graders multiply and divide decimals by multiples of ten. They mentally solve simple problems containing powers of ten. This two-page learning exercise contains 10 problems. | |
# Computing the Pixel Coordinates of a 3D Point
## Finding the 2D Pixel Coordinates of a 3D Point: Explained from Beginning to End
When a point or vertex is defined in the scene and is visible to the camera, the point appears in the image as a dot (or, more precisely, as a pixel if the image is digital). We already t... | |
<meta http-equiv="refresh" content="1; url=/nojavascript/">
You are viewing an older version of this Concept. Go to the latest version.
# AA Similarity
%
Progress
Practice AA Similarity
Progress
%
AA Similarity
What if you were given a pair of triangles and the angle measures for two of their angles? How could you u... | |
## Brauer Groups and Tate-Shafarevich Groups
J. Math. Sci. Univ. Tokyo
Vol. 10 (2003), No. 2, Page 391--419.
Gonzalez-Aviles, Cristian D.
Brauer Groups and Tate-Shafarevich Groups
Abstract:
Let $X_K$ be a proper, smooth and geometrically connected curve over a global field $K$. In this paper we generalize a formula ... | |
Find the forces if given resultant.
1. Nov 7, 2009
williamx11373
Find the forces....if given resultant.
the problem is in the link below.....
http://i44.photobucket.com/albums/f46/maximus11373/353.jpg
i fully understand how to find the resultant when given the forces but do not know how to find the forces when gi... | |
### The Well component
An area for containing components with a border and a gray background. No title or label is shown for this component.
In addition to the methods listed below, this component inherits properties and methods from the superclass Component. For example, any Well component has a label and hidden pro... | |
## Archive for February, 2014
### Differentiating power series
February 22, 2014
I’m writing this post as a way of preparing for a lecture. I want to discuss the result that a power series $\sum_{n=0}^\infty a_nz^n$ is differentiable inside its circle of convergence, and the derivative is given by the obvious formul... | |
## The Lemniscate
2016 Dec 27
After creating a tilted parabola, I started looking into other types of graphs that are also loci of points. A locus is a set of all points fulfilling some specific condition, like the parabola, the locus of all points equidistant from the focus point and the directrix line. One simple l... | |
# How do I modify the system PATH in Windows 2003/Windows 2008 using a script?
How do I modify the system PATH environment variable using script (or even a registry setting) so that when Windows boots it's already configured?
-
## 2 Answers
My google-fu was lacking earlier. The way to do this is using the SETX tool... | |
# Teaching Product of Prime Factors
Number theory, or the study of integers (the counting numbers 1, 2, 3..., their opposites –1, –2, –3..., and 0), has fascinated mathematicians for years. Prime numbers, a concept introduced to most students in Grades 4 and up, are fundamental to number theory. They form the basic bu... | |
# Ellipsoid¶
Elllipsoids are defined by their local coordinates and three semi-axes.
## Ellipsoid-Ellipsoid contact¶
Thsi algorithm is implemented in by woo.dem.Cg2_Ellipsoid_Ellipsoid_L6Geom.
Following , we note semi-axes $$a_i$$ and $$b_i$$ as $$i\in\{1,2,3\}$$; local axes are given as sets of orthonormal vectors... | |
# sand discharge speed from a conveyor belt
##### Sand drops on a conveyor belt at constant rate Physics ...
Jan 09, 2021 Homework Statement: A conveyor belt is driven at velocity ##v## by a motor. Sand drops vertically on to the belt at a rate of ##m~kg~s^{-1}##. What is the additional power needed to keep the conv... | |
Article Text
## other Versions
Biodefence and the production of knowledge: rethinking the problem
Free
1. Allen Buchanan1,
2. Maureen C Kelley2
1. 1Duke University, Durham, North Carolina, USA
2. 2University of Washington, School of Medicine, Seattle, Washington, USA
1. Correspondence to Dr Allen Buchanan, Duke Unive... | |
# ENGR 101: Introduction to Computers and Programming
Using Computing to Solve Engineering Problems
Syllabus Winter 2023
# Course Overview
Engineering 101 focuses on using your computer to solve engineering problems through computer programming. Many engineering problems involve repetition – getting data and doing ... | |
# Math Help - pressure....
1. ## pressure....
I have one more question I desperately need help with out of the 20 we had assigned.
A mature gorilla weighs 400lb and stands 5ft tall; its 2 feet combined have an area of about 1 ft squared.
give an estimate of the gorilla weight when it was half as tall.
what assumptio... | |
# AutoCAD Crack Full Version [32|64bit] ♚
Equipped with the right applications, a computer can be of great help in virtually any domain of activity. When it comes to designing and precision, no other tool is as accurate as a computer. Moreover, specialized applications such as AutoCAD give you the possibility to desig... | |
×
Get Full Access to Organic Chemistry - 7 Edition - Chapter 10 - Problem 10.44
Get Full Access to Organic Chemistry - 7 Edition - Chapter 10 - Problem 10.44
×
Chrysanthemic acid occurs as a mixture of esters in flowers of the
ISBN: 9781133952848 483
Solution for problem 10.44 Chapter 10
Organic Chemistry | 7th Ed... | |
# User:Litzy84/review
## My Second Article Review
Lizeth Enriqueta Palafox Limones Aguascalientes, Ags. Saturday October 7th 2011
Review of Mohd Hilmi Hamzah & Lu Yee Ting, "Teaching speaking skills through group work activities"
How can teachers make ESL students (Universiti Teknologi Malaysia) speak in English by... | |
## College Algebra (10th Edition)
RECAL: A sum of two cubes $x^3+a^3$ can be factored using the formula: $x^3+a^3=(x+a)(x^2-ax+a^2)$ Note that the trinomial factor in the given expression does not match the one in the formula above. Thus, the given statement is false. | |
×
# Decrease of Rating when Clicking on a Problem
Once I click on a problem, I find that my rating decreases immediately. Is this a glitch, or is this supposed to happen?
Note by Minimario Minimario
3 years, 7 months ago
## Comments
Sort by:
Top Newest
I believe this is because if you look at a problem and then ... | |
# Example of Lebesgue Integral but not Riemann Integrable
1. Nov 16, 2008
### Nusc
What's Example of Lebesgue Integrable function which is not Riemann Integrable?
2. Nov 16, 2008
### morphism
There are plenty. Can you think of a characteristic function of a nonempty measurable set (of finite measure) that is disc... | |
# Math Help - Ok, what am I doing wrong??
1. ## Ok, what am I doing wrong??
Find the area of the minor segment formed on an arc of length 36cm drawn on a circle of radius 50cm.
Chord length = 2rsin(theta/2)
2 * 50sin(theta/2) = 36
theta = 0.7365
Area of segment = 0.5r^2(theta-sintheta)
= 81.01cm^2
Correct answer =... | |
# Mochitest FAQ¶
## SSL and https-enabled tests¶
Mochitests must be run from http://mochi.test/ to succeed. However, some tests may require use of additional protocols, hosts, or ports to test cross-origin functionality.
The Mochitest harness addresses this need by mirroring all content of the original server onto a... | |
# Moishezon projectivity criterion for Moishezon spaces with canonical singularites
A Moishezon manifold is projective if and only if it is Kähler. This is no longer true for a singular Moishezon space. Moishezon proved a projectivity criterion for Moishezon spaces with isolated singularities. It is also known for Moi... | |
# Random NumberGenerators
#### The Art of Mathematical Computing
by Benjamin (Bill) Planche
feat. Philipp Jovanovic
Slides at github.com/Aldream/presentations
# Structure
1. Randomness - defs + pseudo-randomness
2. RNGs & PRNGs - defs + implementation
3. Test Tools - suites + implementation
# Randomness
Lack of p... | |
## 30 January 2016
### Extended Response to Nick Rowe
Nick Rowe on Twitter earlier today:
If [a] central bank targeted the price of peanuts, would we blame recessions on bad peanut harvests? Or blame [the] central bank for not raising [the] target price?
It depends. It depends on how quickly the central bank finds ou... | |
# Probability an honest node finds the next block vs. probability the attacker finds the next block
I am trying to understand Satoshi's paper [1]. On page 6 of the paper, he calculates the probability that someone can attack the blockchain from z blocks behind. He begins by defining:
My question: The mining of a bloc... | |
### Multi-Party Threshold Private Set Intersection with Sublinear Communication
Saikrishna Badrinarayanan, Peihan Miao, Srinivasan Raghuraman, and Peter Rindal
##### Abstract
In multi-party threshold private set intersection (PSI), $n$ parties each with a private set wish to compute the intersection of their sets if... | |
# Node, Postgres, and Sequelize
Let’s build a CRUD app with Node (v4.1.1), Express (v4.13.1), Sequelize (v3.12.2), and PostgreSQL (9.4.4).
This a follow-up to PostgreSQL and NodeJS.
## Getting Started
Grab the initial boilerplate and install the dependencies:
Now run a quick sanity check:
If all went well, a new ... | |
# Data containers¶
## DataContainer¶
class mchammer.DataContainer(structure, ensemble_parameters, metadata={})[source]
Data container for storing information concerned with Monte Carlo simulations performed with mchammer.
Parameters
• structure (ase.Atoms) – reference atomic structure associated with the data conta... | |
## Notes on Notation – Variables
Variables have often been seen as the big bugaboo of the middle school math curriculum and beyond. They have become inextricably identified with that 7-letter curse word “algebra”. I submit most teachers have encountered some variation on student Jesse who says in utter frustration: ... | |
# Irreducible representation of tensor field
by su-ki
Tags: field, irreducible, representation, tensor
P: 2 In Mark Srednicki's book "Quantum Field Theory" He says that a tensor field $B^{αβ}$ with no particular symmetry can be written as :- $B^{αβ} = A^{αβ} + S^{αβ} + (1/4) g^{αβ} T(x)$ Equn. 33.6 where A - Antisymm... | |
CoCalc Public FilesSD109 - Tutorial.ipynb
Author: Fredrik Strömberg
Views : 200
Description: Tutorial made for the Virtual Global Sage Days 109
# Introduction to Python and SageMath
We will introduce some of the fundamental concepts in Python and SageMath.
## Learning outcomes
1. Introduction to SageMath
2. Learn h... | |
# Find side of an equilateral triangle inscribed in a rhombus
The lengths of the diagonals of a rhombus are 6 and 8. An equilateral triangle inscribed in this rhombus has one vertex at an end-point of the shorter diagonal and one side parallel to the longer diagonal. Determine the length of a side of this triangle. Ex... | |
# Breaking RSA if small subset invertible
I am trying to solve a problem which states that one can invert RSA if a small subset of the cipher text are invertible, the problem is as follows:
Given a function which can invert the RSA encryption that is given $C=M^e$, the function can compute $M$ for small subset (typic... | |
# Determine if a person differs from typical performance
I have a database of workers, customers, and jobs, and I want to analyze my data to see if a given worker is performing well above or below the mean. I've come up with something of a solution, and I'm interested in hearing if there are any flaws in my current ap... | |
# MIS capacitor
MIS structure (Metal / SiO2 / p-Si) in a vertical MIS capacitor
A MIS capacitor is a capacitor formed from a layer of metal, a layer of insulating material and a layer of semiconductor material. It gets its name from the initials of the metal-insulator-semiconductor structure. As with the MOS field-ef... | |
## Double Doors Regional P4 - Tudor Teaches Jason How To Be Productive
View as PDF
Points: 10
Time limit: 1.0s
Java 2.0s
Memory limit: 256M
Java 256M
Problem type
Tudor is teaching Jason how to be productive!
One day, Tudor decides that Jason isn't taking his work seriously enough, and installs some software to mo... | |
# Rectangle Contained by Medial Straight Lines Commensurable in Length is Medial
## Theorem
In the words of Euclid:
The rectangle contained by medial straight lines commensurable in length is medial.
## Proof
Let $x$ and $\lambda x$ be two medials such that:
$x \frown \lambda x$
where $\frown$ denotes that $x$ a... | |
Graphs of Trigonometric Functions - Problem Solving
Contents
Cite as: Graphs of Trigonometric Functions - Problem Solving. Brilliant.org. Retrieved from https://brilliant.org/wiki/graphs-of-trigonometric-functions/
× | |
## Friday, July 5, 2013
The far-ultraviolet (FUV) diffuse emission is predominantly due to scattering of starlight from interstellar dust grains which shows a large regional variation depending on the relative orientations of dust and stars. The observations of the FUV (1000 -- 1150 \AA) diffuse radiation in the Magel... | |
# Is the use of whipple shields on satellites common?
How common is the use of whipple shields or of any micro-meteor and debris shields in general for satellites in low earth orbit , I couldn't find any relevant statistics on the internet, a rough estimate would suffice.
• Maybe because the price of sending 1kg weig... | |
# Matt's arXiv selection: week ending 20 March 2009
From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Wed, 20 May 2009 16:57:48 +1000
The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Dear subscribers,
Geoff Lee deserves the credit for preparing this email. ... | |
# An algorithm for checking if a nonlinear function f is always positive
Is there an algorithm to check if a given (possibly nonlinear) function f is always positive?
The idea that I currently have is to find the roots of the function (using newton-raphson algorithm or similar techniques, see http://en.wikipedia.org/... | |
Forces in Connected Objects (Systems) Video Lessons
Concept
# Problem: The hand in the figure is pushing on the back of block A. Blocks A and B, with mB>mA, are connected by a massless string and slide on a frictionless surface. Is the force of the string on B larger than, smaller than, or equal to the force of th... | |
In what units to quote the thermal Blackbody temperature
Just a quick question relating to the thermal Blackbody temperature of a celestial object. In the c.g.s regime of astrophysics, is it more 'sophisticated' to quote the thermal Blackbody temperature in units of Kelvin ($\mathrm{K}$) or in units of $\mathrm{keV}$?... | |
# Math Latex Font Size
Math Latex Font Size. When the documents display in a classroom, the 'u' and 'v' look too similar. I need to change the math font in my documents.
However, \small doesn't work in the equation environment. Is there another way to change the font in the math mode? I need a font with pointy vees.
... | |
My Math Forum Average cost differentiation
User Name Remember Me? Password
Calculus Calculus Math Forum
April 26th, 2011, 02:33 PM #1 Newbie Joined: Apr 2011 Posts: 5 Thanks: 0 Average cost differentiation Hi i need some help to derive the AC (average cost) function and find the output which minimises the AC I'v... | |
Align endeffector of robot with vector
Hi!
as it says in the header I want to align my endeffector with a vector in space. In my case the z-axis of the EE should be aligned with the vector. This means that the x-, and y-axis are not specified.
Right now I only manage to navigate the EE to a certain pose where the x-... | |
# Need to show {x | f(x) ≤ g(x)} closed if f,g continuous.
• August 14th 2009, 09:06 PM
numberstrong
Need to show {x | f(x) ≤ g(x)} closed if f,g continuous.
I'm sure this is pretty elementary but I am intellectually needy.
I need to show that with $f,g :X \rightarrow Y$ both continuous and with $Y$ in the order topo... | |
## Stream: new members
### Topic: prime sum of two squares one sentence proof
#### Moritz Firsching (Jan 18 2021 at 20:51):
I can now fill in all the sorry in the above and also finished proving the following statements that will come handy later:
lemma z_at_least_one_fix (p:ℕ) (k: ℤ)
(hp : p.prime)
(h₁ : 0 < (1:ℤ)... | |
## anonymous one year ago Points A (-10,-6) and B (6,2) are the endpoints of AB. What are the coordinates of point C on AB such that AC is 3/4 the length of AB? a. (0,-1) b. (2,0) c. (-2,-2) d. (4,1)
• This Question is Open
1. anonymous
@Owlcoffee
2. Owlcoffee
Are you fond to vectors?
3. anonymous
Thanks
4. anon... | |
resriel - 1 year ago 35
CSS Question
# How to create a grid of elements (divs/spans) in perfect squares with their backgrounds set to images
I've been working on a website that serves as a gallery for fantasy art, an evolving project, and I've currently hit a barricade in where to go from something I can't get to wor... | |
# Finding the determinant of a matrix given determinants of other matrices
Consider the following matrices:
$P$ = $\begin{pmatrix}a&2d&1\\ b&2e&-2\\ c&2f&-1\end{pmatrix}$
$U$ = $\begin{pmatrix}a&b&c\\ 2&3&2\\ d&e&f\end{pmatrix}$
$V$ = $\begin{pmatrix}a&b&c\\ d&e&f\\ 1&5&3\end{pmatrix}$
If you are given that $det(P... | |
# BoxCox - Box-Cox Transform
Returns the Box-Cox transformation of the input data point(s).
## Syntax
BOXCOX(X, Lo, Hi, $\lambda$, Return)
X
is the real value(s) for which we compute the transformation of a single value or a one-dimensional array of cells (e.g., rows or columns)).
Lo
is the x-domain lower limit. If... | |
# Magnetic Field, Potential, Velocity
## Homework Statement
An electron travels with speed 1.0 x 107
m/s between the two parallel charged
plates shown in the adjacent figure. The
plates are separated by 1.0 cm and are
charged by a 200 V battery. What magnetic
field strength and direction will allow the
electron to pa... | |
# Catalyst mixing problem
Catalyst mixing problem
State dimension: 1
Differential states: 2
Continuous control functions: 1
Path constraints: 2
Interior point equalities: 2
The Catalyst mixing problem seeks an optimal policy for mixing two catalysts "along the length of a tubular plug ow reactor involving several rea... | |
# How to Factor Binomials
In algebra, binomials are two-term expressions connected with a plus sign or minus sign, such as ${\displaystyle ax+b}$. The first term always includes a variable, while the second term may or may not. Factoring a binomial means finding simpler terms that, when multiplied together, produce th... | |
# zbMATH — the first resource for mathematics
Some projective representations of $$S_n$$. (English) Zbl 0433.20010
##### MSC:
20C30 Representations of finite symmetric groups 20C25 Projective representations and multipliers
Full Text:
##### References:
[1] \scJ. Conway and R. Curtis, “An atlas of finite groups.” [2... | |
# Difference between revisions of "2020 AMC 8 Problems/Problem 21"
## Problem
A game board consists of $64$ squares that alternate in color between black and white. The figure below shows square $P$ in the bottom row and square $Q$ in the top row. A marker is placed at $P.$ A step consists of moving the marker onto o... | |
# nLab S-duality
Contents
### Context
#### Duality in string theory
duality in string theory
general mechanisms
string-fivebrane duality
string-string dualities
M-theory
F-theory
string-QFT duality
QFT-QFT duality from wrapped M5-branes:
## Phenomenology
#### Langlands correspondence
The term S-duality ca... |
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