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Topological Spaces May 19th 2010, 08:07 PM #1 Newbie Joined Apr 2009 Posts 11 Topological Spaces Let X and Y be a topological spaces. Suppose X is the union of two closed subsets A and B of X . Let f: A -> Y and g: B-> Y be continuous. If f(x)=g(x) for every x in the intersection of A and B, ...
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Solving Systems Using Elimination I need help solving this problem using elimination 2x-2y=61 2x+y=-7 Please help(Nerd)(Nerd)!! 2x+2y=61 2x+y=7 2x+2y=61 -2y -2y __________ 2x = 61 - 2y ___________ 2 -> divide both sides by 2 x = 30.5 - y put this x value into other equation: 2(30.5 -y) +y = 7 61 - 2y + y = 7 -y -y ___...
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Math Forum Discussions Math Forum Ask Dr. Math Discussions Internet Newsletter MathTools Teacher2Teacher Teacher Exchange Workshops Search All of the Math Forum: Views expressed in these public forums are not endorsed by Drexel University or The Math Forum. Topic: Collinear Replies: 9 Last Post: May 8, 2013 1:12 P...
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What's the intuition between formal smoothness, etaleness. and unramifiedness? up vote 17 down vote favorite 17 Let $f: X \to Y$ be a morphism of schemes. Then $f$ is called (EGA IV.17) formally smooth if whenever $T$ is an affine $Y$-scheme and $T'$ a closed subscheme of $T$ defined by a nilpotent ideal (it's suffic...
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A subring question (revised) up vote 2 down vote favorite 2 Hello, Let $K/{\mathbb Q}$ be a finite extension which is not necessarily Galois, and ${\mathcal O}$ be the ring of integers of $K$. Let $p$ be a prime in ${\mathbb Q}$ and let $p {\mathcal O}={\ mathfrak p}_1^{k_1} \cdots {\mathfrak p}_r^{k_r}$ be its prime ...
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Is there a nice expression for the number of lattice points on a sphere? up vote 3 down vote favorite Possible Duplicate: Is there a simple way to compute the number of ways to write a positive integer as the sum of three squares? Is there a nice expression for the number of points in $\mathbb{Z}^3$ which lie...
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How many cubes cover a bigger cube? up vote 53 down vote favorite 16 How many $n$-dimensional unit cubes are needed to cover a cube with side lengths $1+\epsilon$ for some $\epsilon>0$? For n=1, the answer is obviously two. For n=2, the drawing below shows that three unit cubes suffice, but it is impossible using...
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help with induction May 25th 2011, 03:13 PM #46 Member Joined May 2011 From Sacramento, CA Posts 165 You forget MoeBlee, that we don't know if some number $10^{10^{10}}$ might not be an n such that n = 3j + 8k. That is the point of induction. Therefore, while it is necessary for 13 to fail to be s...
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u_{xx}-u_{yy}+u_y=0 December 29th 2010, 07:53 PM #1 MHF Contributor Joined Mar 2010 From Florida Posts 3,093 Thanks 5 u_{xx}-u_{yy}+u_y=0 Using exponential substitution: $\exp{(rx+sy)}$ $u_{xx}-u_{yy}+u_y=0$ $\exp{(rx+sy)}(r^2-s^2+s)=0$ $r=\pm\sqrt{s^2-s}$ $u=\exp{(\pm x\...
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Nearly constant curvature implies "nearly isometric" to a space form? up vote 6 down vote favorite It is well known a Riemannian manifold with constant sectional curvature is a quotient of the Euclidean space, hyperbolic space or sphere. In particular we know how their metric looks like locally. My question is, is th...
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Math Forum Discussions - Re: A single term formula for calculating the circumference of ellipse Date: Dec 26, 2011 10:37 PM Author: thomasinventions@yahoo.com Subject: Re: A single term formula for calculating the circumference of ellipse That's fabulous. Note, as I've used recently in a different fashion, (1-h) coul...
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Natural Frequency Equation of Motion : Natural Frequency Figure 2 shows a simple undamped spring-mass system, which is assumed to move only along the vertical direction. It has one degree of freedom (DOF), because its motion is described by a single coordinate x. When placed into motion, oscillation w...
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Phase Difference Auto Focusing For Synthetic Aperture Radar Imaging - Patent 4999635 United States Patent: 4999635   ( 1 of 1 ) United States Patent 4,999,635 Niho March 12, 1991 Phase difference auto focusing for synthetic aperture radar imaging ...
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RTe-bookAgDegNormalFormul RTe-bookAgDegNormalFormul.doc FORMULATION FOR: RTe-bookAgDegNormal.xls This document is a companion to the spreadsheet: RTe-bookAgDegNorma...
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differential propositional calculus differential propositional calculus Contents: • 1 Casual introduction • 2 Cactus calculus • 3 Formal development 1 Casual introduction Consider the situation represented by the venn diagram in Figure 1. Figure $1.$ Local Habitations, And Names The area of the rectangle r...
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Nth root of a matrix as an analytic function? up vote 2 down vote favorite Let $A$ be a $k \times k$ invertible matrix over complex numbers. If it possible to write its nth root as an analytic function (i.e. power series in $A$)? EDIT: Complex coefficients can be functions of $A$. Notes If a matrix $A$ has only on...
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Finite T-uples and the axiom of Regularity up vote 1 down vote favorite Let V be the universe of sets (the class of all sets). Let U(0)=V, U(1)=V*V, the class that is cartesian product of the class V=U(0) with V, and for n>=1, let U(n+1)=U(n)*U(0); For every natural integer n, let T(n)=U(n+1)/U(n) be the class that is...
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Some problems... June 4th 2006, 09:22 AM ReadingChick Some problems... I've been having some trouble with some trig problems. It would be great if someone could help me to do them. I'm not very sure how to put in symbols such as pie, etc. so I apologize in advance for having to write it out. :o *Using a...
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Projectile Motion February 14th 2011, 12:15 PM Darkprince Projectile Motion I have the following problem: A projectile of mass m is launched from the origin at time t=0, with speed U, at an angle of elevation a+b to the horizontal. The launch site lies on a ramp that makes an angle b to the horizontal (Y...
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About digits in a number March 12th 2008, 01:34 AM san4unall About digits in a number Hi, Could anyone please tell me if there is any formula or method to find the number of digits in the result of multiplication of 2 numbers? For e.g. if a 12 digit number is multiplied by a 16 digit no. then how many d...
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Very basic topology question June 15th 2011, 09:18 PM BWilson Very basic topology question Hello, I am having some difficulty on problem 17 of chapter 2 in Rudin's Principles of Mathematical Analysis. The problem reads: "Let E be the set of all x in [0,1] whose decimal expansion contains only the digits 4 an...
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Anything special (historical?) about surface $x\cdot y\cdot z\ +\ x+y+z=0$? up vote 11 down vote favorite 1 QUESTION I wanted to introduce and develop the complex logarithm from scratch. As the result I've arrived a couple of months ago at the following identity after which the road to complex logarithm is wide ope...
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Calculate Vapor Pressure Change Using Raoult's Law This example problem demonstrates how to use Raoult's Law to calculate the change in vapor pressure by adding a nonvolatile liquid to a solvent. Problem: What is the change in vapor pressure when 164 g of glycerin (C[3]H[8]O[3]) is added to 338 mL of H[2]O at 39.8 °C...
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Extending finite morphisms of curves to finite morphisms of arithmetic surfaces up vote 4 down vote favorite 1 Let $\pi:Y\longrightarrow X$ be a finite morphism of smooth projective geometrically connected curves over a number field $K$. Let $h:\mathcal{X}\longrightarrow \textrm{Spec} \ O_K$ be a regular integral flat...
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Higher dimensional Bezout via Hilbert polynomials: a reference up vote 3 down vote favorite 2 For the purposes of teaching my elementary course in algebraic geometry I am looking for a reference (or notes) that contains a complete proof of a higher-dimensional weak Bezout theorem. I only want to learn about a proof th...
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Touring China and Thailand Date: 5/30/96 at 1:49:34 From: Eric Liu Subject: How long is the tour? Hi! This is Cristian. I have two math questions: 1. A tour to China is twice as long as a tour to Thailand. If both tours last 5 weeks and 1 day altogether, how long is the tour to China? 2. The total of the a...
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Need help on this tricky question August 20th 2010, 05:16 AM JohnLord123 Need help on this tricky question Find the sum: Cos^2 (0) + Cos^2 (2) + Cos^2 (4) + Cos^2 (356) + Cos^2 (358) + Cos^2 (360) Thanks in advance. August 20th 2010, 10:02 AM earboth Quote: 1. I assume that the argument of the...
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For which rings does there exist an invertible Vandermonde matrix? up vote 2 down vote favorite 2 Suppose $R$ is a commutative ring, and $S \subset R^{n\times n}$ is an $R$-module. We are given $H_0,\dots,H_n \in R^{n\times n}$, and we know that for all $r \in R$, $$H_0 + r H_1 + \dots r^n H_n \ in S$$ The question is...
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Lens Tutorial This note gives a tutorial on lenses and gives some common lens formulas. I attempted to make it between an FAQ (just simple facts) and a textbook. I generally give the starting point of an idea, and then skip to the results, leaving out all the algebra. If any part of it is too detailed, just skip ahea...
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Polynomial representing all nonnegative integers up vote 186 down vote favorite 98 Lagrange proved that every nonnegative integer is a sum of 4 squares. Gauss proved that every nonnegative integer is a sum of 3 triangular numbers. Is there a 2-variable polynomial $f(x,y) \in \mathbf{Q}[x,y]$ such that $f(\mathbf{Z} ...
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seemingly simple derivative October 17th 2009, 05:51 PM #1 Newbie Joined Oct 2009 Posts 14 seemingly simple derivative hello all. my friend has asked me for help on a derivation but i've come up blank. the derivation in question is: $\frac{d}{dx}lnx^{lnx}$ i thought $lnx$ he thought $...
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Dimension of central simple algebra over a global field "built using class field theory". up vote 13 down vote favorite 2 If $F$ is a global field then a standard exact sequence relating the Brauer groups of $F$ and its completions is the following: $$0\to Br(F)\to\oplus_v Br(F_v)\to\mathbf{Q}/\mathbf{Z}\to 0.$$ The...
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Too long equation Add tags Information and discussion about LaTeX's math and science related features (e.g. formulas, graphs). 7 posts • Page 1 of 1 Hello everybody, I have a very long equation and this causes me some problems. I want it to look the following way: left side = right side\\ +continuation of right si...
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Line Integral over Curve April 27th 2010, 10:00 PM #1 Newbie Joined Apr 2010 Posts 5 Line Integral over Curve Calculate $\int_{C} z dx+x dy+y dz$ where C is the curve obtained by intersecting surfaces $z=x^2$ and $x^2+y^2=4$, oriented so that the z-coordinate increases along C. That C has to be...
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Standard deviation 1. April 13th 2009, 08:51 AM #1 IM using my brothers account with his permission of course thanks Last edited by osmosis786; April 14th 2009 at 04:58 AM. 2. April 13th 2009, 06:33 PM #2 3. April 14th 2009, 03:44 AM #3 I dont need someone to read my ans...
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Group problem with Abelian Prove that a group G is Abelian iff $(ab)^{-1} = a^{-1}b^{-1}$. We have $(ab)^{-1}=b^{-1}a^{-1}$ Then the equality becomes $a^{-1}b^{-1}=b^{-1}a^{-1}$. Multiply both sides at left by $a$: $aa^{-1}b^{-1}a=ab^{-1}a^{-1}a\Rightarrow b^{-1}a=ab^{-1}$ Now, multiply both sides by $b$ $bb^{-1}ab=ba...
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Average Rate of Change October 27th 2008, 07:44 AM #1 MHF Contributor Joined Jul 2008 From NYC Posts 1,489 Average Rate of Change For the function given below, answer (a) through (c). (a) For each function below, find the average rate of change of f from 1 to x: [f(x) - f(1)]/(x - 1), w...
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Noether's Theorem in Quantum Mechanics up vote 10 down vote favorite 10 In classical mechanics: If a Lagrangian L is preserved by an infinitesimal change in the state space variables q[i] -> q[i] + εK[i](q) leads to only second order change in the Lagrangian: $$ 0 = \frac{dL}{d\epsilon} = \ sum_i \left( \frac{\partia...
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10.2 Arch and Chords Bell work Find the value of radius, x, if the diameter of a circle is 25 ft. 25 ft x Bell work Answer Radius, x, is 12.5 ft Unit 3 : Circles: 10.2 Arcs and Chords Objectives: Students ...
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Is \sqrt{1-x^2} uniformly continuous? May 3rd 2009, 01:52 PM #1 Is \sqrt{1-x^2} uniformly continuous? Is $f(x)=\sqrt{1-x^2}$ uniformly continuous? Here is my proposed solution. Break $[-1,1]$ into three partitions: $[-1,-4/5]\cup(-4/5,4/5)\cup[4/5,1]$ On $[-1,-4/5]$, $f(x)$ is defined on a compact ...
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Class number of non-maximal order in imaginary quadratic function field? up vote 7 down vote favorite 2 It is well known that for $K=\mathbb{Q}(\sqrt{D})$, $D < 0$, the non-maximal order of squarefree conductor $f$, relatively prime to $D$, has class number $$h_K \prod_{p|f} (p-(\frac{D}{p}))$$ What is the class numb...
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Nikon MicroscopyU CCD Resolution for Optical Microscopy The ultimate resolution of a CCD is a function of the number of photodiodes and their size relative to the image projected onto the chip's surface by the microscope optics. When att...
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Given a graph embedded on a torus, how many edges are necessary for noncontractible loops to be long? up vote 11 down vote favorite 6 If we are given a graph embedded on a torus, with the following properties, what is the minimum number of edges it can have? • Any noncontractible loop is comprised of at least n edg...
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Fermat's Theorem March 3rd 2011, 01:32 PM mathematic Fermat's Theorem I was wondering if someone might be able to look over my proof's involving Fermat's Theorem. When n = 2p, where p is an odd prime, then a^(n-1)= a (mod n) for any integer a. So let n=2p We have a^(2p-1) a^(2p)*1/a a^2a^p*1...
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Short Term Decision Making-Limiting Factor (Part 1) August 20th, 2006 Comments off One part of managerial accounting is the need to understand limiting factor for short term decision. As a result of limited supply of resources constraint, a company normally cannot produces as many products as it wish. The limited sup...
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[SOLVED] Show that 2 + 8x - 2x^3 = 0 has three real solutions August 1st 2009, 07:08 AM #1 Junior Member Joined Aug 2009 Posts 29 [SOLVED] Show that 2 + 8x - 2x^3 = 0 has three real solutions Hi How do I show that 2 + 8x - 2x^3 = 0 has three real solutions? I know you can say it has at most thr...
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Explanation and Test Case for Pick's Theorem Date: 06/13/2006 at 02:47:54 From: Anelisa Subject: the use of area theorems to check validity of Pick's theorem I want to be able to test Pick's Theorem for the area of polygons. I want to accompany each polygon with a detailed test of the formula. But I don't really un...
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Dirichlet Inverse Problem June 27th 2011, 02:16 PM #1 Junior Member Joined Jun 2010 Posts 59 Dirichlet Inverse Problem The Dirichlet Convolution is this: $(f * g)(n) = \sum\limits_{d \mid n} f(d)g(\frac{n}{d})$ The $\iota(n)$ function: $\iota(n) = \begin{cases} 1 & \text{if } n = 1 \\ 0 & ...
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tangent sphere bundle over sphere up vote 3 down vote favorite 2 are there some general description about tangent sphere bundle over sphere? (it is a special $S^{n-1}$bundle over $S^n$) say for n=1,it is trivial,$S^0\times S^1$,for n=2,it is $SO(3)\cong \mathbb{R}P^3$, for n=3,it is trivial again,so it is for n=7. ho...
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Computing the function field of a curve given as a subvariety of the Jacobian of its cover or merely the degree of the covering up vote 0 down vote favorite I read following paragraph from: G. Tamme, Teilkörper höheren Geschlechts eines algebraischen Funktionenkörpers, Arch. Math. 23 (1972), 257--259 Here $C$ is a c...
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prove by induction 6 divides n^3 -n May 31st 2008, 05:08 PM robocop_911 prove by induction 6 divides n^3 -n Hello there! I don't get it - what to assume in the following problem for solving by induction Prove that 6 divides n^3 - n whenever n is a nonnegative integer I tried following: assume...
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Fermat's Last Theorem June 16th 2010, 10:02 AM #1 Newbie Joined Jun 2010 Posts 11 Fermat's Last Theorem I am having troubles showing that if you could prove Fermat's Last Theorem for n = 4 and you knew it held for any odd prime then Fermat's Last Theorem holds. I am not entirely sure where to start....
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Emirps November 2, 2010 We give three solutions. The first uses a function emirp? to identify emirps and enumerates them by testing each n in range: (define (rev n) (undigits (reverse (digits n)))) (define (palin? n) (= n (rev n))) (define (emirp? n) (and (prime? n) (prime? (rev n)) (not (palin? n)))) (define (emirp...
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need homework help March 28th 2007, 07:34 PM mimi need homework help Here's the two questions i'm having problems with: 1. Complete 1300 cm2 = ____m2. 2. given a right triangle with b=4 and c =11, find a approximated to three decimal places. thank you so much in advance...Mimi March 28th 2007, 07:...
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Can any countably generated k-algebra occur as the ring of global sections of some variety? up vote 5 down vote favorite 1 In the answer to this question we saw that there exists a nonsingular quasi-projective threefold over a field with non-finitely generated global sections. I was talking about this previous questi...
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sample size Sample Size Chapter 13 Two Ways to Classify Techniques • Fixed or sequential sampling • Sample size logic is based on traditional (such as Neyman-Pearson) or Bayesian inferential methods Sample Size Affected by Practical Issues • Time pressure ...
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Sphere inscribed in pyramid 1. September 21st 2012, 10:53 AM #1 2. September 21st 2012, 02:44 PM #2 Re: Sphere inscribed in pyramid Hi, aleschio. I don't think we need to know $\beta.$ I will use $m$ to denote the measure of a length. My idea is something like this: 1) Since the base i...
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Exotic functions In my generative 2d art such as Aleph Null and dbCinema, a virtual ‘brush’ moves around the screen ‘painting’. So I have need of functions that aren’t particularly predictable but buzz around the screen–and stay on screen. Ideally, they’d look like a human scrawl. Like the graphics in this article. Wh...
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a number proof or disproof question if a>0 then we can write $a^3=b^2-c^2$$b,c\in\mathbb{Z}$ how can ı prove the truthness this equation Don't you see that $\forall a \in \mathbb{N}^{*},\ a^{3}=\left( \frac{a^{2}+a}{2}\right)^{2}-\left( \frac{a^{2}-a}{2} \right)^{2}$ ? Actually, you can write $a^{3}=(b+c)(b-c)$, and a...
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Exchangeable of the limitation $\lim_{x\rightarrow1-0}\sum_{n=1}^{\infty}\frac{x^{n-1}}{nln(n+1)} = \sum_{n=1}^{\infty}\lim_{x\rightarrow1-0}\frac{x^{n-1}}{nln(n+1)}$ Is the above equation right? in the other words, can we take the limitation into the summation? Yes, as long as the quantity considered is positive. The...
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Shapes of torus and modular group In June 2012, I emphasized that the Higgs field was the first experimentally observed elementary scalar field – the Higgs boson is the first elementary spinless particle we know – and because string theory loves to predict scalar fields and gives them many roles while many alternative ...
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Supervised Clustering for Spam Detection in Data Streams Ulf Brefeld Peter Haider and Tobias Scheffer Technical University Berlin, Germany u ...
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bound on sum of logarithms November 29th 2011, 10:45 AM #1 Newbie Joined Nov 2011 Posts 12 bound on sum of logarithms I have that $\prod_{i,j} (1-y_{ij}) \geq l$, where $1> y_{ij}\geq 0$ I need to bound the following using $l$ $\prod_{i,j} (1-a_{ij}y_{ij}) \geq ?$, where $1> y_{ij}\geq 0$ ...
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Parabola word problem about a suspension bridge July 19th 2010, 11:38 AM iluvpigs1991 Parabola word problem about a suspension bridge The two towers on either end will be 50 feet high and 300 feet apart. The two supporting cables are connected at the top of the towers and hang in a curve that is a parabola. Ther...
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[SOLVED] Hyperbola April 16th 2010, 04:50 PM #1 Junior Member Joined Apr 2010 Posts 29 [SOLVED] Hyperbola Hello. For this question - Show how to determine a point P of the hyperbola xy = c^2 such that the asymptotes cut off a segment of length 6c in the tangent at P, I've equated 6c^2= sqrt[a^2...
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Please help! (Area) August 28th 2008, 10:58 AM #1 Newbie Joined Aug 2008 Posts 5 A central angle of a circle with radius 10 has a measure of 1.35 radians. The secant line between the end points of the arc of the angle divides the sector swept by the arc into two regions, one a triangle and the other b...
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When to use L'Hospital's Rule... I'm having some issues determining when I can and cannot use L'Hospital's Rule. Tips? Suggested approaches? You can use it when you have the following typical cases: #1 Indetermination of the form $\frac00.$ #2 Indetermination of the form $\frac\infty\infty.$ Of course, if you're solvi...
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The Twelve-Step Cycle of 4/sin(x) Beginning with any real number x, the sequence of values produced by iterating the function x → -4/sin(x) invariably converges on the twelve-step cycle [] or else the cycle consisting o...
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Chapter 9 – Solids and Fluids This chapter deals with properties of solids and fluids (liquid and gases). One of the properties of a material is its elasticity, which is a measure of the extent to which a force can deform the material. In particular, ...
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Mandelbrot set and analytic functions such that $f(az)=f(z)^2+c$ up vote 5 down vote favorite 1 It is well known that the function $f(z)=2\cos(\sqrt {-z})$ (or more accurately the entire function $f(z)=2\sum_{n=0}^\infty \frac{z^n}{(2n)!}$) satisfies such a functional equation, i.e. $f(4z)= f (z)^2-2$ ; it is not hard...
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Are surface bundles over a surface with non-zero signature necessarily complex (or algebraic)? up vote 12 down vote favorite 6 By "surface bundle over a surface" I mean a compact, oriented 4-manifold $X$ which is the total space of an oriented fiber bundle $X\to B $ over an oriented 2-manifold $B$. Assume that the sig...
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A urn contain N white December 29th 2009, 09:02 PM #1 Banned Joined Dec 2008 From Mauritius Posts 523 A urn contain N white Question : A urn contain N white and M black balls. Balls are randomly selected, one at a time , until a black one is obtained . It we assume that each selected ball is replace...
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Designing Cycloidal Gears Hugh Sparks April 26, 2013 http://www.csparks.com Watches and clocks traditionally use cycloidal gearing. This page will show you how to design these gears and the cutters used to make them. The focus will be on the design described in British Standard 978 Part 2: Cycloidal Type Gears. This ...
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Coordinate Systems April 27th 2008, 08:30 PM geton Coordinate Systems I've two question, please help me to solve. Question 1: A line with gradient 4 touches the parabola with equation y^2 = 4x. Find the coordinates of the point of contact of this tangent with the parabola and an equation of the normal t...
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Differentiating y May 4th 2013, 02:38 AM Paze Differentiating y I can't seem to wrap my head around differentiating y or f(x). For example: x^2+xy^2=2. I understand the product rule and everyone keeps saying that ''it's just the product rule'' when I'm differentiating implicitly like that, but I don't have ...
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Math Problems need hELP!! September 23rd 2007, 12:38 PM lemontea Math Problems need hELP!! Can anyone help me with these two problems! THank You!!! 1) Evaluate: http://img.photobucket.com/albums/v3...athproblem.jpg 2.) a and b are two integers, and a>b. The sum of a and b is 5, but their product is ...
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Spheres over rational numbers and other fields up vote 6 down vote favorite 1 Let K be an ordered field. Define the n-sphere: $$S^n(K) := \{ (x_1,x_2,\dots,x_n+1) \in K^{n+1} \mid \sum_{i=1}^{n+1} x_i^2 = 1 \}$$ A set of vectors $v_1, v_2, \dots, v_r \in S^n(K)$ is orthonormal if the dot product of any two of them i...
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Lucas Sequences, Revisited January 21, 2014 Lucas sequences are important both to the study of prime numbers and in cryptography, and we’ve used Lucas sequences in several previous exercises, most recently just a few months ago; unfortunately, some of the code given in some of those exercises was incorrect, and looki...
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4 ?'s Help Me Please!!! Lane 1. Find the 3 cofactors of the second row of: $<br /> A=\left [ \begin{array}{ccc}<br /> {-7}& {-5}&{6}\\<br /> {9}& {4}&{-3}\\<br /> {8}&{-1}&{2}<br /> \end{array} \right]<br />$ The cofactor $C_{i,j}$ is $(-1)^{i+j}$ times the determinant of the matrix obtained from $A$ by deleting the $i...
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Error to sum of Euler phi-functions up vote 12 down vote favorite 4 The number theory identity $\phi(1) + \phi(2) + \dots + \phi(n) \approx \frac{3n^2}{\pi^2}$ can be interpreted as counting relatively prime pairs of numbers $0 \leq \{ x,y \} \leq n$ . Has anyone studied the distribution of error term? $\displaystyle...
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Continuous Strictly Positive Measures on Countable Boolean Algebras up vote 4 down vote favorite This is a followup to: Strictly Positive Measures on Countable Boolean Algebras Suppose a countable Boolean algebra B is a subalgebra of the power set of the reals. (For example, let B be the Boolean algebra of definable...
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Vector Proof - Dot and Cross Products February 25th 2009, 10:53 AM #1 Junior Member Joined Jul 2008 Posts 74 Vector Proof - Dot and Cross Products Hello everyone, I am having some trouble with the following problem and would appreciate help. Thank you! --- 16. For any vectors $\vec{a}, \ve...
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Meromorphic 1-form and Picard's theorem up vote 13 down vote favorite 5 Let $D$ be the open unit disk in the complex plane and $U_1,U_2,\,\ldots\,,U_n$ be an open cover of the puntured disk $D^*= D\setminus\{0\}$. Suppose on each open set $U_j$ there is an injective holomorphic function $f_j$ such that $df_j=df_k$ on ...
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Extension Fields Date: 12/03/98 at 08:49:17 From: Andy Ullom Subject: Modern Algebra Problems I have looked at these problems and do not know where to start. Could you give me a little help? We are working with Extension Fields. 1) Show that Q(sqrt(2), sqrt(3)) = Q(sqrt(2) + sqrt(3)) 2) Find the splitting field o...
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Is the transcendence degree of a domain over a subfield the same as that of the fraction field of that domain? up vote 3 down vote favorite 1 Consider the inclusion $k\subset A$ of the field $k$ in the domain $A$ and the fraction field $K=Frac(A)$ of $A$. Obviously if a family $(a_i)_{i\in I}$ of elements $a_i \in A$ ...
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Tutorial One of the most striking features of QOCA is its simple interface. To understand the interface design, consider a simple application, that of a constraint-based graphics editor. The editor essentially provides three operations: the user may add objects or constraints, the user may delete an object or constrain...
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Area Between Curves Date: 01/11/97 at 00:40:11 From: Anonymous Subject: The Application of integrals I have no trouble finding the area between curves when there are only two curves, but this problem involves three. I get an answer, but it is off by .02. The book states it as a fraction, so I assume that my number s...
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Expressing fiber product of affines via an ideal up vote 1 down vote favorite Let $X$ (resp. $Y$) be the affine $k$-scheme defined by the ideal $I$ (resp. $J$) in the polynomial ring $k[x_1,...x_n]$ (resp. $k[y_1,...,y_m]$). Let $Z$ be the affine scheme defined by the ideal $L$ in $k[z_1,...z_s]$, and let $f^\*:k[z]/L...
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Does each finite morphism of curves have a model whose minimal resolution is semi-stable up vote 2 down vote favorite Let $\pi:Y\to X$ be a finite morphism of smooth projective geometrically connected curves over a number field $K$. Question. Does there exist a finite field extension $L/K$ and a regular model $\mathc...
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H^4 of the Monster up vote 32 down vote favorite 11 The Monster group $M$ acts on the moonshine vertex algebra $V^\natural$. Because $V^\natural$ is a holomorphic vertex algebra (i.e., it has a unique irreducible module), there is a corresponding cohomology class $c\in H^3(M;S^1)=H^4(M;\mathbb Z)$ associated to this ...
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Symmetric Matrix proof ! December 11th 2009, 05:27 AM Avi06 Symmetric Matrix proof ! Given that A is a n x n symmetric matrix and $\lambda_{1} \geq \lambda_{2} \geq .... \geq \lambda_{n}$ , where $\lambda_{i}$ are eigenvalues of A. Show that: $<br /> \lambda_{1}\|x\|^{2} \geq x^{T}Ax \geq \lambda_{n}\|x...
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Tensor product and basis January 21st 2011, 02:57 PM #1 Member Joined Oct 2010 Posts 131 Tensor product and basis Hello, Let V,W be some finite dim. vector spaces and denote $(e_i)_{i=1,..,n}, (g_j)_{j=1,..,m}$ the bases of V,W respectively. Now i want to show that $(e_i \otimes g_j) ,1\leq i,j...
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A Group-Delay Interpretation of Polyphase Filters Previously, polyphase interpolation and decimation were derived from the Noble identities and motivated for reasons of computational efficiency. Here we present a different interpretation of the (ideal) polyphase filter. Assume that H⁢zHz is an ideal lowpass filter wit...
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Ring Isomorphism November 1st 2008, 01:50 PM #1 Ring Isomorphism Let R and S be rings and let I ▹R, J ▹S be ideals. Prove that $(R\times S)/(I\times J) \simeq (R/I) \times (S/J)$ I think $(R\times S)/(I\times J)$ is of the form $(a,b) + (I,J) : a \in R, b \in S$ that is also of the form $(a + I, b + J...
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The Riemann's Zeta Function represented as a continued fraction and a question of convergence. up vote 9 down vote favorite 6 The Riemann's zeta function can be expressed as a continued fraction as follows \begin{align*} \zeta(z)=\newcommand{\bigk}{\mathop{\Huge\vcenter{\hbox{K}}}}\left(1-\bigk_{k=1}^{\infty }\frac{-e...
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Perfect Square Trinomial September 30th 2008, 04:23 AM #1 Member Joined Dec 2007 Posts 96 Find two values of b that will make [tex]9x^2+bx+25[tex] a perfect square trinomial. The formulas for Perfect Square Trinomial are: [tex](a+b)^2=a^2+2ab+b^2[tex] [tex](a-b)^2=a^2-2ab+b^2[tex] As I s...
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Acyclic models via model categories? up vote 12 down vote favorite 5 Recall the acyclic models theorem: given two functors $F, G$ from a "category $\mathcal{C}$ with models $M$" to the category of chain complexes of modules over a ring $R$, a natural transformation $H_0(F) \to H_0(G)$ induces a natural transformation ...
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Center for Science Education: SOLUTIONS TO THE SECOND HOUR EXAM 1. Newtons's first law states that an object at rest stays at rest unless acted on by outside forces; an object in motion stays in constant motion unless acted on by outs...
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kinetic energy January 6th 2009, 12:50 PM #1 Junior Member Joined Feb 2008 Posts 71 kinetic energy Okay so i'll go right to it (been sitting about 2 hours with this question); An icecube is sliding 3 meters friction free off the ledge of a house roof which has the angle of 27 degrees. What speed wil...
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[ -0.0018310546875, 0.056396484375, -0.0751953125, 0.00055694580078125, 0.004852294921875, 0.0194091796875, -0.017333984375, 0.02197265625, 0.01806640625, 0.054931640625, 0.0137939453125, -0.08642578125, -0.060302734375, -0.0034027099609375, 0.0294189453125, -0.00811767578125, -0.05175...
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Genus computation up vote 1 down vote favorite 2 What is the smartest way to compute the genus of a hyperelliptic curve $C: y^2 = f(x)$ (with $f$ a separable polynomial of degree $n> 3$ over a field $k = \bar{k}$ of characteristic $0$ (prob. characteristic unequal $2$ is enough). (Just to be precise, I am referring to...
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[ -0.032470703125, 0.061279296875, 0.0028076171875, -0.0057373046875, 0.01446533203125, -0.07080078125, -0.07763671875, 0.02392578125, 0.0137939453125, -0.0322265625, 0.06787109375, -0.01708984375, -0.10302734375, 0.034423828125, -0.017578125, 0.01116943359375, -0.0576171875, 0.02490...
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