content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
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1.
IsTim Group Title
Best Response... | 5 | [
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Cross Products
Date: 02/28/99 at 10:32:16
From: Sarah Harvard
Subject: Cross-products
I am having trouble understanding cross-products. Will you please
explain them to me?
Date: 02/28/99 at 12:47:52
From: Doctor Reno
Subject: Re: Cross-products
Hi, Sarah!
Cross-products can be used for three purposes: to compare... | 4 | [
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quadratic algebra
August 28th 2009, 12:09 AM
sammy28
quadratic algebra
hi all,
the question posed is
Given that $x^2-14x+a = (x+b)^2$ for all values of $x$, find the value of $a$ and the value of $b$.
is this correct?
since
$(x+A)^2=x^2+2Ax+A^2$
$x^2+2Ax=(x+A)^2-A^2$
so
$x... | 4 | [
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Verifying a function has an inverse
July 26th 2011, 12:41 PM #1
Junior Member
Joined
Jul 2011
Posts
28
Verifying a function has an inverse
Verify $f(x) = 1 - 2x - x^3$ has an inverse, and find $(f^{-1})'(4)$.
So I take the derivative and get $f'(x) = -2 -3x^2$.
It's negative for all x, so it's ... | 5 | [
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... | 12,603 | 12603 | |
K-12 Math Problems
Linear permutation refers to the number of ordered arrangement of objects in a line while circular permutations is an ordered arrangement of objects in a circular manner. If you want to know for
example the number of different arrangements of 5 people can sit around a circle or the number of differen... | 4 | [
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Generalizing Krull's Principal Ideal Theorem to Modules
up vote 3 down vote favorite
Let $R = \mathbf{C}[x_1, \ldots, x_n]$ and let $M$ be a graded $R$-module which is finite-dimensional over $\mathbf{C}$ and suppose $ 0 \leftarrow M \leftarrow R^g \leftarrow R^d \leftarrow \cdots $
is a minimal resolution of $M$. I b... | 5 | [
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-0.02... | 12,605 | 12605 | |
Binomial distribution and Mega-Millions Lottery ROI
As of this morning, the Mega-Millions lottery for this week is at a record-setting grand prize level of $540M (when taken in installments) or $389M lump sum payout. The odds of any given ticket
winning is 1 in 175,711,536. So, if you are a risk-neutral “investor” a... | 4 | [
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Algebraic axiomatization for AB+BA^T operation on matrices
up vote 9 down vote favorite
5
Let us consider a matrix algebra $Mat_{n\times n}(K)$, where $K$ is a field, $char K \neq 2.$
It is well-known that the axiomatization of commutator operation $[A,B]=AB-BA$ on matrix algebra leads us to the theory of Lie algebra... | 4 | [
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(infinity,n)-category
Context
Higher category theory
Basic concepts
Basic theorems
Applications
Models
Morphisms
Functors
Universal constructions
Extra properties and structure
1-categorical presentations
Contents
Idea
In higher category theory an $(\infty,n)$-category may be thought of as
Accordingly, th... | 4 | [
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-0... | 12,608 | 12608 | |
A STUDY OF SHUTTLECOCK'S TRAJECTORY IN BADMINTON , JSSM-2009, Vol.8, Issue 4, 657 - 662
When a shuttlecock is in flight, according to Newton's Second Law:
In equation (1): ^3 in the air (density~1.205kg·m^3), to be about 0.02 gw. We may neglect its very slight influence, when compared with the force of gravity and aer... | 4 | [
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Symmetric, Transitive, and Reflexive Relations
Date: 11/10/98 at 11:30:27
From: Mike
Subject: Discrete math
Suppose R is a symmetric and transitive relation on A. Suppose that
for each a in A there is b in A such that (a,b) and is in R.
Show: R is an equivalence relation.
Suppose R is a reflexive and transitive rel... | 5 | [
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Creating an Infinite Series with a Specific Property
up vote -1 down vote favorite
Hello Mathematicians,
Recently I have been doing some work which has an interesting application to another problem as a consequence. However many searches for this latter problem have not returned a proper name for it, so
I would be ve... | 5 | [
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0.001449... | 12,611 | 12611 | |
Find the Flaw
Date: 08/02/2001 at 23:12:48
From: Dan Swanton
Subject: I can't find the flaw in my false proof.
I have carefully read the Dr. Math FAQ and still don't understand
where the following proof goes wrong.
e^(i*x) = cos(x) + sin(x)*i
e^(2*pi*i) = 1
e^((2*pi)/i) = 1
e^(2*pi*i) = e^((2*pi)/i)
ln(e^(2*pi*i)) ... | 4 | [
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Homework Help
Posted by Anthony on Thursday, December 6, 2007 at 1:05am.
step 1:
x = integral(from 0 to v) dv/(z^2-v^2)
step 2:
x = 1/2z ln((q+v)/(q-v))
How do you get from step 1 to step 2 ?
• Math - drwls, Thursday, December 6, 2007 at 2:40am
The indefinite integral of
dv/(z^2-v^2),
with z being ... | 5 | [
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Lawvere interval
Context
Topos Theory
Could not include topos theory - contents
Contents
Definition
Let $A$ be a small category, and let $Psh(A)=Set^{A^{op}}$ be the category of presheaves on $A$. Since $Psh(A)$ is a Grothendieck topos, it has a unique subobject classifier, $L$.
Let $\mathbf{0}$ and $\mathbf{1}$ ... | 4 | [
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-0.030... | 12,614 | 12614 | |
Quantifier elimination vs decidability
up vote 4 down vote favorite
Quantifier elimination is used as a technique to get decidability (e.g. $Th( \mathbb{N}, +)$ ) of theories, but typically one has to go over to some expansion. Are there examples of theories which
are decidable but there is (provably) no expansion whi... | 5 | [
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Analyzing Performance Data for Real User Measurement
The content of this article was originally written by Philip Tellis over at Speed Awareness Month.
At LogNormal, we’re all about collecting and making sense of real user performance data. We collect over a billion data points a month, and there’s a lot you can tell... | 4 | [
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0.0... | 12,616 | 12616 | |
Analog Devices : Analog Dialogue : Phase Relations
Volume 41 – October 2007
Download this article in PDF format. (628K)
Phase Relations in Active Filters
In applications that use filters, the amplitude response is generally of greater interest than the phase response. But in some applications, the phase response of... | 4 | [
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0.0354... | 12,617 | 12617 | |
Homework Help
Posted by Catherine on Tuesday, March 15, 2011 at 3:18pm.
Find dy/dx in terms of x and y if xlny+y^6= (9)lnx
• Calculus - bobpursley, Tuesday, March 15, 2011 at 3:20pm
x lny+ y^6=9lnx
lny +xy'/y+6y^5 y'=9/x
solve for y'
• Calculus - Catherine, Tuesday, March 15, 2011 at 3:53pm
I... | 5 | [
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... | 12,618 | 12618 | |
nrich.maths.org
Copyright © University of Cambridge. All rights reserved.
'After Thought' printed from http://nrich.maths.org/
Sue Liu, S6, Madras College St Andrews sent one of her super solutions in which she wrote $\sin(\cos x)$ as $\cos (\cos (x - (\pi/2)$ and then used the formula which gives the difference of ... | 5 | [
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... | 12,619 | 12619 | |
Computation of Measures of Size
Table of Contents | Search Technical Documentation | References
Computation of Measures of Size
Establishment of Measures of Size for Each Jurisdiction
The initial measure of size MOS[js] for school s in jurisdiction j is set as follows as a function of x[js], the total number of ... | 4 | [
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0.0349... | 12,620 | 12620 | |
positive semidefiniteness: a psd matrix substracted by another rank 1 psd matrix
up vote 0 down vote favorite
Given that $A$ is a positive semidefinite matrix, $x$ is a vector, $\lambda_0 \in [0, +\infty) $ is a real non-negative number. I want to know the answer to the following optimization problem.
$$ \arg \min_{\... | 5 | [
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0.0... | 12,621 | 12621 | |
EN224: LINEAR ELASTICITY
EN224: Linear Elasticity
Division of Engineering
6.5 Example Problems Using Airy Stress Functions
There are many excellent textbooks which describe in great detail the use of Airy functions to solve plane problems in elastostatics. We will not repeat this material here. Inste... | 5 | [
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... | 12,622 | 12622 | |
Finite groups with centerless quotients
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.
Is there a description of finite groups whose all quotients have trivial center? Is it true that only direct products of non-abelian... | 5 | [
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Constructing a Closed Box
November 4th 2008, 06:35 AM
magentarita
Constructing a Closed Box
A closed box with a square base is required to have a volume of 10 cubic feet.
(a) Express the amount A of material used to make such a box as a function of the length x of a side of the square base.
(b) How muc... | 4 | [
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0.... | 12,624 | 12624 | |
Physics ~please help me!
Posted by Isis on Sunday, February 3, 2013 at 4:30pm.
1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s in 100 m.
a) What is the initial kinetic energy of the car?
b) What is the final kinetic energy of the car?
c) what is the net work applied to the car?
d) what force is applied to the... | 4 | [
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0.0... | 12,625 | 12625 | |
Quadratic Equations and Forms
December 12th 2006, 10:13 AM #1
Newbie
Joined
Dec 2006
Posts
7
Quadratic Equations and Forms
If I have a relation in Vertex form, how do I make it into standard form?
y = a(x-h)^2 + k into y = ax^2 + bx +c
Example questions:
a) y = 5(x+3)^2 -2
b) y = 2x(5-2... | 4 | [
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-0... | 12,626 | 12626 | |
Runge-Kutta method
From Encyclopedia of Mathematics
(Redirected from
Runge–Kutta method
)
A one-step method for numerically solving the Cauchy problem for a system of ordinary differential equations of the form
The principal idea of the Runge–Kutta method was proposed by C. Runge [1] and developed later by W. Kut... | 4 | [
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0.03515625,
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0.0004787445068359375,
-0.04248046875,
-0.06201171875,
0.056884765... | 12,627 | 12627 | |
org.jscience.mathematics.number
Package org.jscience.mathematics.number
Provides common types of numbers most of them implementing the
field
interface.
See: Description
• Class Summary
Class Des... | 5 | [
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0.01721191... | 12,628 | 12628 | |
Interleaving Fibonacci Numbers
The sequence of Fibonacci numbers is defined by the initial values f[0] = 0, f[1] = 1, and the recurrence f[n] = f[n-1] + f[n-2]. The first several values are
[]
Notice that the even-order... | 4 | [
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Quasicrystals as sums of waves in the plane
On the suggestion of a friend, I rendered this animation:
This quasicrystal is full of emergent patterns, but it can be described in a simple way. Imagine that every point in the plane is shaded according to the cosine of its y coordinate. The result would
look like this:
N... | 4 | [
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... | 12,630 | 12630 | |
Finite Group: Prime Order Property
Date: 02/11/2003 at 01:43:10
From: Nura
Subject: Group Theory
Suppose that G is a finite group with the property that every
nonidentity element has prime order. If Z(G) is not trivial, prove
that every nonidentity element of G has the same order.
Date: 02/11/2003 at 02:31:27
From:... | 5 | [
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Dodecahedral K3?
up vote 7 down vote favorite
4
In pondering this MO question and in particularly its 1st answer, and answers to
this one recently posed, I realized there ought to be a dodecahedral K3 surface $X$. This $X$ would fiber as an elliptic surface over $CP^1$ with 12 singular fibers, each of type $I_2$. The
... | 5 | [
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Math Forum Discussions - Re: diff eq
Date: Apr 11, 2013 2:27 AM
Author: Torsten
Subject: Re: diff eq
> >
> > By the way:
> > You should call ODE45 with a row vector of inital values, i.e.
> > [t,a] = ode45(@eq1, [0:.1:10], [1 0 0 0])
> >
> > Best wishes
> > Torsten.
>
> Are you sure that the initial conditions need t... | 5 | [
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valuation ring
Contents
Definition-Proposition
A valuation ring is a commutative integral domain $O$ which satisfies any of the following equivalent conditions
• for every nonzero element $x$ in its field of fractions $K$, either $x \in O$ or $x^{-1} \in O$.
• The ideals of $O$ are totally ordered by inclusion
... | 4 | [
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Vedic Mathematics Lesson 17: Division By The Nikhilam Method III
In the
previous lesson
, we learnt how to extend the method we learnt for division by 9 in the
earlier lesson
, to denominators that consist of a series of 9's. In this lesson, we will deal with denominators that are not all 9's.
You can find all th... | 5 | [
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Golf Is a Good Walk Ruined
July 28, 2012 at 10:08 pm 5 comments
The title of this post is a quote attributed to Mark Twain. I would amend it as follows:
Golf may be a good walk ruined — but it’s a good time to think about math.
Not too long ago, I attended a conference at the Asilomar Conference Center on the ... | 4 | [
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Worked Examples of Correlation Calculations [TimeWeb]
ILLUSTRATION
Correlation Coefficients: Examples
Spearman's Rank Correlation Coefficient
In calculating this coefficient, we use the Greek letter 'rho' or r
The formula used to calculate this coefficient is:
r = 1 - (6^2 ) / n(n^2 - 1)
To illustrate this, consid... | 4 | [
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groupoid cardinality
Context
Homotopy theory
Background
Variations
Definitions
Paths and cylinders
Homotopy groups
Theorems
Higher category theory
Basic concepts
Basic theorems
Applications
Models
Morphisms
Functors
Universal constructions
Extra properties and structure
1-categorical presentations
Con... | 4 | [
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0.028... | 12,638 | 12638 | |
Posts from February 2010 on mvngu
Archive for February, 2010
Sage 4.3.3 merged an implementation of the Blum-Goldwasser probabilistic public-key encryption scheme described in the following paper:
I wrote that implementation based on a public domain version by Mike Hogan and David Joyner. See ticket #7746 for backgro... | 5 | [
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-0.0181884765625,
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-0.09814453... | 12,639 | 12639 | |
On the curvature in logarithmic plots of rate coefficients for chemical reactions
Abstract
In terms of the reduced potential energy barrier ζ = Δu[TS]/kT, the rate coefficients for chemical reactions are usually expressed as proportional to e^-ζ. The coupling between vibrational modes of
the medium to the reaction coo... | 4 | [
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-0.01190185546875,
-0.... | 12,640 | 12640 | |
Bounding the growth of rational bivariate polynomials from below
up vote 6 down vote favorite
The following question is an attempt to find a lower bound for the value of a polynomial at integer points. It is something that I originally thought about while trying to understand how it would be
possible to approach this ... | 4 | [
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... | 12,641 | 12641 | |
A basic question about selfnormalizing subgroups
up vote 3 down vote favorite
1
Let $H, K$ be incomparable subgroups of $G$. The following is false:
$ N_G(H \cap K) = H \cap K \quad \Rightarrow \quad N_G(H)=H \text{ and } N_G(K)=K $
Here is a counter-example:
$ G = A_6, \quad H = (C_3 \times C_3) : C_2, \quad \quad... | 5 | [
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0.07470703125... | 12,642 | 12642 | |
Bicartesian closed categories and Heyting algebras
up vote 0 down vote favorite
In Lambek and Scott's "Introduction to higher order categorical logic" (1988), they state that every Heyting Algebra can be understood as a bicartesian closed category.
On the other hand, fixing a bicartesian closed category, and using $A... | 4 | [
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Determination of optimal dosing ratios
Contents - Previous
App 5.1: Background
App 5.2: Derivation of a formula to predict optimal dose ratios
App 5.3: Practical consequences
App 5.4: Reference
Contributor:
Andy Coward
Tim Cole
The consequences of changing isotopic backgrounds have been dis... | 4 | [
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-0.007781982421875... | 12,644 | 12644 | |
Substituting in Linear Equations
Date: 11/14/2001 at 19:22:10
From: Jeannette
Subject: Substituting in Linear Equations
Okay, I am given a question where I have two equations
2y = 5x+8x
3y = 4x+9x
Now I am told to substitute "something" but I don't understand
anything about solving linear equations.
If you... | 4 | [
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0.0299072265625,... | 12,645 | 12645 | |
ary
Narrow Search
Earth and space science
Mathematics
Sort by:
Per page:
Now showing results 91-100 of 116
This is a booklet containing 20 problem sets that involve a variety of math skills, including equations and substitution, time calculations, reading, algebra, and more. Each set of problems is
contained on o... | 4 | [
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0.03271484375,
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0.062011718... | 12,646 | 12646 | |
Proving a Polynomial is Irreducible using Eisenstein's Criterion
Date: 10/18/2004 at 02:02:59
From: Gunnar
Subject: Irreducible polynomials over Q
Let p be a prime number. Show that the polynomial x^p + px + (p-1)
is irreducible over Q if and only if p >= 3.
I had in mind two approaches for the question. Either pr... | 5 | [
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-0.0274658203125,
-0.045166015625... | 12,647 | 12647 | |
The Wire Identification Problem
A bunch of n wires have been labeled at one end with alphabetic codes A, B… The wire identification problem asks for an efficient procedure to mark the other end of the bunch with the corresponding
labels. The wires run underground so you can’t track them individually and any wire is vi... | 4 | [
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Marginal Structural Models to Estimate the Causal Effect of... : Epidemiology
Marginal structural models (MSMs) can be used to estimate the causal effect of a time-dependent exposure in the presence of time-dependent confounders that are themselves affected by previous
treatment. ^1,2 The use of MSMs can be an alternat... | 4 | [
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-0.0... | 12,649 | 12649 | |
temporal logic
Contents
Idea
Temporal logics, as their name suggests, are logics that involve time. They form a very large and important class of modal logics, but here we will, to start with, only look at some simple cases.
Temporal logics are very closely related to tense logic?s.
Basic temporal language, (BTL)
F... | 4 | [
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0.00982666015625,
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... | 12,650 | 12650 | |
e
Chance Misunderstandings
I wrote this article before the Editor pointed out that Devon McCormick had treated the same topic in 21.1 [1]. How could I have missed it? No sign of 21.1 among my shelf of Vectors so I went to the
obvious hiding place, Anthony’s shelf of Vectors: Eureka! On reading Devon’s piece, I think ... | 5 | [
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0.030517578125,
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-0.045898... | 12,651 | 12651 | |
tion
Modeling the Reliability of Ball Bearings
Chrys Caroni
National Technical University of Athens
Journal of Statistics Education Volume 10, Number 3 (2002), www.amstat.org/publications/jse/v10n3/datasets.caroni.html
Copyright © 2002 by Chrys Caroni, all rights reserved. This text may be freely shared among indivi... | 4 | [
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0.0233154296875,... | 12,652 | 12652 | |
Parallel
In this section we describe two more involved examples of using an IPython cluster to perform a parallel computation. In these examples, we will be using IPython’s “pylab” mode, which enables
interactive plotting using the Matplotlib package. IPython can be started in this mode by typing:
at the system comma... | 5 | [
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0.03564453125,... | 12,653 | 12653 | |
Minus One Two Three
Copyright © University of Cambridge. All rights reserved.
Some good thinking from Berny at Gordonstoun School, and others, connecting the algebra to the shape and position of the quadratic graph (parabola) :
When we set a problem on the NRICH site there's often an insight we hope you'll discover a... | 4 | [
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to Understand Bonds
Bond Investment Strategies
Using Math to Understand Bonds
Mathematics is one of the keys to understanding the bond market. But it is important not to get too hung up on this. Grasping the concepts that underlie the bond market is the crucial task. Most of
the data needed to make an investing deci... | 4 | [
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Trace identities and the Kauffman Bracket skein module
up vote 5 down vote favorite
3
Let's consider $K_t(M)$, the Kauffman bracket skein module (see this and this papers) of a three-manifold $M$. When $t=-1$, $K_t(M)$ is easily seen to be isomorphic to the ring of functions on the
character variety $X=\operatorname{H... | 4 | [
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-0.0030975341796875,
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-0.06103515625,
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0.10302734375,
-0.028... | 12,656 | 12656 | |
Commutator Subgroup - Group Theory
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.
Given a rank-2 group $G= < a,b> $ . Is it true and trivial that $ [G,G] = < [a,b], [b,a] > $ ?
... | 5 | [
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-0.0203857421... | 12,657 | 12657 | |
Understanding the L’Hôpital Rule
22 Tuesday May 2012
Posted in Statistics and Mathematics
Understanding the L’Hôpital Rule
If you are struggling trying to understand the L’Hôpital Rule, also called the L’Hospital Rule (with the ‘s’ silent), this post if for you. I assume you know basic calculus—at least what is ... | 5 | [
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-0.00531005859375,
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0.0... | 12,658 | 12658 | |
Open immersions of open manifolds
up vote 27 down vote favorite
8
For concreteness, I will work in the category of smooth manifolds, but my question makes sense in topological and PL category as well. Recall that a manifold $M$ is called open if every connected
component of $M$ is non-compact.
Question. Is it true th... | 4 | [
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0.05078125,
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-0.01385498046875... | 12,659 | 12659 | |
Joint p.d.f
February 17th 2011, 09:36 AM #1
Junior Member
Joined
Sep 2009
Posts
33
Joint p.d.f
Can anyone help with the following question please?
The continuous random variables X and Y have the joint probability density function,
f XY (x,y) = 6x, 0 < x < 1, 0 < y < 1-x
Derive the margina... | 5 | [
0.0203857421875,
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0.037353515625,
0.015625,
0.0242919921875,
-0.04150390625,
-0.07373046875,... | 12,660 | 12660 | |
Efficient way to calculate distance matrix given latitude and longitude data in Python
up vote 4 down vote favorite
1
I have data for latitude and longitude, and I need to calculate distance matrix between two arrays containing locations. I used this This to get distance between two locations given latitude and
longit... | 4 | [
0.0306396484375,
-0.06103515625,
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-0.050537109375,
-0.0172119140625,
0.0255126953125,
0.002166748046875,
-0.011047363... | 12,661 | 12661 | |
Probability Theory — A Primer
It is a wonder that we have yet to officially write about probability theory on this blog. Probability theory underlies a huge portion of artificial intelligence, machine learning, and statistics,
and a number of our future posts will rely on the ideas and terminology we lay out in this p... | 4 | [
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0.027587890625,
... | 12,662 | 12662 | |
Isomorphic Groups and Subrings
Date: 04/15/98 at 15:15:07
From: Leonie Williams
Subject: abstract or modern algebra
I have a few problems in my abstract algebra class that I just can't
figure out. The problem is that I don't even know how to get started
on these.
1) Let G = {a+b*sqrt[2]: a,b element of Q (rationals... | 5 | [
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0.08056640625,
-0.03173828125,
0.040283203125,
-0.... | 12,663 | 12663 | |
The Clausius-Clapeyron Equation
In 1834 Benoit Paul Émile Clapeyron (1799 Feb 26 – 1864 Jan 28) published his "Memoir on the Motive Power of Heat" in the Journal de l’Ecole Polytechnique and in 1843 he had it republished in
Poggendorf’... | 5 | [
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-0.15625,
0.077... | 12,664 | 12664 | |
Chi -Square !
January 16th 2012, 04:28 PM #1
Newbie
Joined
Jan 2012
Posts
2
Could you help me solve this question. Many thanks !
The Dow-Jones daily returns for the period 1920-2006 under the normal likelihood show a
raw mean of 0.00020 and standard deviation of 0.01140. Skewness is -0.6673 and k... | 4 | [
0.036376953125,
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-0.0908203125,
... | 12,665 | 12665 | |
What is 0.999... + 0.999...?
Date: 09/27/1999 at 20:19:48
From: Darryl Jarman
Subject: What is 0.999... + 0.999...?
Hello,
While discussing the 1 = 0.999... solution, a person asked what is
0.999... + 0.999...? I think it is a good question - one that I could
not answer. It should be 2 but how do we show this?
In ... | 5 | [
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-0.0888671875,
-0.0... | 12,666 | 12666 | |
Proving n^1/n tends to 1
November 6th 2012, 02:57 AM #1
Newbie
Joined
Nov 2012
From
bath
Posts
1
Proving n^1/n tends to 1
I need to prove that n^1/n tends to 1 as n tends to infinity.
I have a hint that says write n^1/n=1+h and use Binomial Theorem
Im just not sure where to start.
Any ide... | 5 | [
0.034423828125,
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0.024658203125,
-0.00153350830078125,
0.0308837890625,
-0.0250244140625,
0.0098876953125,
-0.0050964... | 12,667 | 12667 | |
Aproximating dynamical systems by intrinsically ergodic systems
up vote 6 down vote favorite
2
Let $X$ be a compact metric space and $f:X \to X$ a continuous map. We say that $(X,f)$ is approximated from below by a sequence of compact metric spaces $(X_i)_{i \geq 1}$ and a sequence of
continuous transformations $(f_i)... | 5 | [
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0.0615... | 12,668 | 12668 | |
C program - inverse of a matrix
hi, this is my first time on this board, so i apologise in advanced if i broke any rules or whatever...
so basically, im supposed to use C to find theinverse of a matrix of whose size and values are entered by the user. I am supposed to do so using the following steps:
Step... | 4 | [
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0.019775390625,
-0.047119140625,
-0.07958984375,
0.09521484375,
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0.036865234... | 12,669 | 12669 | |
generating function
This entry is about the generating functions in the sense of algebraic combinatorics. For another notion see generating function in classical mechanics.
A generating function is an element of $R[\![z]\!]$, the rig of formal power series over the rig $R$ (which is often taken to be the natural numbe... | 4 | [
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-0.028564453125,
-0.059814453125,
-0.0220... | 12,670 | 12670 | |
ransitive
template <typename Graph, typename GraphTC,
typename P, typename T, typename R>
void transitive_closure(const Graph& g, GraphTC& tc,
const bgl_named_params<P, T, R>& params = all defaults)
template <typename Graph, typename GraphTC,
typename G_to_TC_VertexMap, typename VertexIndexMap>
void transitive_... | 4 | [
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-0.0272216796875,
-0.053955078125,
0.0712890625,
0.0230712890625,
0.01599... | 12,671 | 12671 | |
Skew Four-Prism
On October 27, 2003, three months after writing up my unsuccessful attempt to duplicate the "skew 4-prismatic system" from the Motro et al. paper cited in the Skew Three-Prism slide, I tried again to
duplicate the computations. I didn't succeed completely, but I think I came closer this time.
I started... | 4 | [
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-0.06982421875,
... | 12,672 | 12672 | |
Notes on operads and the Lie operad
Todd Trimble
Notes on operads and the Lie operad
Contents
The plug-in product
Let $FB$ be the monoidal groupoid of finite sets and bijections, where the monoidal product is obtained by restricting the coproduct on the category of finite sets. Let $F, G: FB \to V$ be species
valued... | 4 | [
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-0.02099609375,
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0.0142822265625,
... | 12,673 | 12673 | |
Asynchronous Sign-magnitude Drive
Introduction
The following article will go though a drive mode where the catch diodes are conducting for a significant amount of time in each cycle. If you haven’t read the introductory page of the series and
you’re not familiar with H-bridge concepts, I suggest you do and only than ... | 4 | [
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0.0191650390625,
... | 12,674 | 12674 | |
injectivity of torsion submodules of injectives
up vote 14 down vote favorite
5
Local cohomology with respect to an ideal $\mathfrak{a}$ is often studied over a Noetherian ring $R$. However, the proof of a lot of basic results does not rely on noetherianity of $R$, but rather on
the following two properties:
(ITI... | 5 | [
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0.043701171875,
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0.033935546875,
0.0301513671875,
0.035888671875,
0.0225830078125,
-0.007598876953... | 12,675 | 12675 | |
Measures of Spread
1.4: Measures of Spread
Created by: CK-12
Learning Objectives
• Calculate the range and interquartile range.
• Calculate the standard deviation for a population and a sample, and understand its meaning.
• Distinguish between the variance and the standard deviation.
• Calculate and apply Ch... | 4 | [
0.08935546875,
-0.0361328125,
0.02197265625,
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0.0927734375,
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-0.021240234375,
0.01519775390625,
-0.0859375,
0.043701171875,
-0.0208... | 12,676 | 12676 | |
Why are Series Musical?
ASKS BLANCHE DESCARTES
MOST mathematicians know the theory of the game of Nim, described in books on mathematical recr... | 4 | [
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-0.01708984375,
-0.052001953125,
-0.05419921875,
0.0223388671875,
-0.0037536621093... | 12,677 | 12677 | |
BEATCALC
BEATCALC: Beat the Calculator!
Back to Calculation Tips & Tricks
┏━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━... | 4 | [
0.034912109375,
-0.05517578125,
0.00689697265625,
-0.0556640625,
-0.09765625,
0.0233154296875,
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-0.015625,
0.01104736328125,
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-0.059326171875,
0.0390625,
0.00030517578125,
-0.00384521484375,
-0.006622314453125,
-0.0908203125,
0.157... | 12,678 | 12678 | |
E. Kowalski's blog
Courtesy of the divisor function, here is another fun example of reasoning in the great style of Euler (the last installment is rather old…) A classical tool to study the distribution of values of $d
(n)$ (the number of positive divisors of $n$) is the Voronoi summation formula, which expresses a sum... | 4 | [
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0.046875,
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-0.00811767578125,
-0.033203125,
-0.0869140625,
0.035400390625,
0.02734375,
-0.0278320... | 12,679 | 12679 | |
Gyroscope
Abstract
This text is dedicated to people that do not have adequate university education and are not familiar with the formalism and abstractions exposed in the books about Mechanics that deal with
gyroscopes. For ... | 4 | [
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-0.0703125,
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-0.04052734375,
0.0322265625,
-... | 12,680 | 12680 | |
Capacitor Current Calculator
Voltage v
Capacitance c
Current A
Example Voltages To Enter
5sin(60t)
10cos(110t)
15sin(120t)
This Capacitor Current Calculator calculates the current which flows through a capacitor based on the capacitance, C, and the voltage, V, that builds up on the capacitor plate... | 5 | [
-0.051025390625,
0.007568359375,
0.0205078125,
-0.025146484375,
0.036865234375,
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0.126953125,
-0.0634765625,
-0.09033203125,
-0.080078125,
0.06640625,
-0.0206... | 12,681 | 12681 | |
disjunction
Context
$(0,1)$-Category theory
Logical disjunction
Definitions
In logic, logical disjunction is the join in the poset of truth values.
Assuming that (as in classical logic) the only truth values are true ($T$) and false ($F$), then the disjunction $p \vee q$ of the truth values $p$ and $q$ may be defi... | 4 | [
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0.08544921875,
0.06640625,
0.0242919921875,
-0.026123046875,
-0.... | 12,682 | 12682 | |
Local fibration vs. stalkwise fibration
up vote 4 down vote favorite
2
Let $\mathbf{C}$ be a Grothendieck site with enough points. Let $p:\mathcal{E}\to \mathcal{F}$ be a map of simplicial presheaves on $\mathbf{C}$. Is it true that $p$ is a local (Kan) fibration if and
only if it is a stalkwise fibration?
To fix ter... | 4 | [
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0.047119140625,
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-0.11181640625,
0.11181640625,
0.052001953125,
-0.000881195068359375,
-0.0087280273437... | 12,683 | 12683 | |
R Tutorials--Counts and Proportions
COUNTS AND PROPORTIONS
Binomial and Poisson Data
Count data--data derived from counting things--are often treated as if they are assumed to be binomial distributed or Poisson distributed. The b... | 5 | [
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-0.055419921875,
0.01080322265625,
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modules over group algebras
up vote 3 down vote favorite
1
Let $G$ be a locally compact group. Then we can define a modular action of $L^1(G)$ on $L^\infty(G)$ by $$ (f.u)(t)=\int f(s)u(st) ds $$ and $$ (u.f)(t)=\int f(s)u(ts) ds $$ for $f\in L^1(G)$ and $u\
in L^\infty(G)$.
On the other hand we know that $L^\infty(G... | 4 | [
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The Cosmological Constant
Annu. Rev. Astron. Astrophys. 1992. 30: 499-542
Copyright © 1992 by . All rights reserved
3.3 Distance Measures
As we look out from our self-defined position at r = 0 to observe some object at a radial coordinate value r[1], we are also looking back in time to some time t[1] < t[0], an... | 4 | [
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International eJournals
InternationaleJournals
Duo Noetherian -Semigroups
A. Gangadhara Rao^1, A. Anjaneyulu^2, D. Madhusudhana Rao^3.
Dept. of Mathematics, V S R & N V R College, Tenali, A.P. India.
^1raoag1967@gmail.com, ^2anj... | 4 | [
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... | 12,687 | 12687 | |
nter
Statistical Intervals
Part 1: The Confidence Interval
Statistical intervals play an important role in statistical inference. But practitioners often confuse the difference among confidence, prediction and tolerance type intervals. This article series
will clarify these differences and indicate when each type of ... | 5 | [
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Modular Square Roots
Date: 03/24/2006 at 08:14:14
From: Philip
Subject: modular square roots
I am trying to find an algorithm for finding modular square roots
where the modulus is either a square or an odd composite.
I've heard about something called Hensel lifting but I don't
understand. The example I found in a p... | 5 | [
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... | 12,689 | 12689 | |
Lineariz
Finance and Economics Discussion Series: 2007-64 Screen Reader version
^♣
Two Pitfalls of Linearization Methods
Keywords: Linearization, linear-quadratic method, second-order approximation, welfare.
Abstract:
This paper illustrates two types of pitfalls in using linearization methods. First, if const... | 4 | [
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-0.0... | 12,690 | 12690 | |
Lines in 3D - Concept
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Lines in 3D - Concept 6,556 views
In the 3D coordinate system, lines can be described using vector equations or parametric equations. Lines in 3D have equations similar to lines in 2D, and... | 4 | [
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0.0... | 12,691 | 12691 | |
When will the pushforward of a structure sheaf still be a structure sheaf?
up vote 13 down vote favorite
7
Let $f:X\rightarrow Y$ be a morphism of schemes.
1. When $PicY\rightarrow PicX$ is an embedding and $f_{*}\mathscr{O}_{X}$ is invertible, it is the structure sheaf of $Y$.
2. In the proof of Zariski's Main Th... | 4 | [
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Pointwise definable models of set theory
• J. D. Hamkins, D. Linetsky, and J. Reitz, “Pointwise definable models of set theory,” Journal of symbolic logic, vol. 78, iss. 1, pp. 139-156, 2013.
@ARTICLE{HamkinsLinetskyReitz2013:PointwiseDefinableModelsOfSetTheory,
AUTHOR = "Joel David Hamkins and David Linets... | 4 | [
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... | 12,693 | 12693 | |
Atomic Models
We know the fundamental particles of the atom. Now let us see, how these particles are arranged in an atom to suggest a model of the atom.
J.J. Thomson, in 1904, presented the first atomic model. He proposed that an atom was a sphere of positive electricity in which were embedded a number of electr... | 5 | [
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EMF AND TORQUE EQUATIONS OF DC MOTORS AND BASIC TORQUES IN DC MOTORS
Hello guys………… now having learnt about the basics of dc motors , we will now go on to derive some of the very standard equations in the field of dc motors
1. THE EMF EQUATION OF A MOTOR………….
Let Ø=flux/pole in webers…….
Z=total number of conductors... | 4 | [
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Average Value of a Function - Concept
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Average Value of a Function - Concept 11,010 views
Calculating the average value of a function over a interval requires using the definite integral. The exact calculation i... | 4 | [
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Expectation of a simple function of multivariate gaussians iid rvs
up vote 6 down vote favorite
2
I would like to compute analytically the following expected value:
$E\left( \frac{X_i^2}{\sum_j \lambda_j^2 X_j^2}\right)$
where the $X_i \approx N(0,1)$ are iid.
It seems an elementary integral, but it is eluding me. ... | 5 | [
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Thermodynamics, Thermal Radiation and the Beginnings of Modern Physics
Thermodynamic s, Thsnr.pl Radiation and the Beginning*
or
luantum Phvsics,
P. 3.0. Bruskiewich
Mathematical-Physics, University ©f British Columbia, Vancouver B.C.
The beginnings of Quantum Theory is introduced in such
a manner as to prese... | 4 | [
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Handicraft works
Making hot-air balloons
Small, well-formed, flyable hot-air balloons can be made by hand.
Instruction and tipps how to build and fly model hot-air balloons
Here you find a description how to build a 115 cm high hot air balloon. This size is practical: it can be build using low cost material, ... | 4 | [
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