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Limit of multivariable function using definition? August 12th 2010, 10:03 AM #1 Junior Member Joined Feb 2010 Posts 54 Limit of multivariable function using definition? I need to prove that the following limits exist but i have to use the definition of a limit.(the definition being that lim[(x,y)tends to...
4
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fourier transforms December 31st 2007, 03:59 AM #1 Junior Member Joined Jun 2007 Posts 43 fourier transforms if $B(x)$ is a scalar field in (3d space) with fourier transform $\widetilde{B}(p)$ and $x\rightarrow x'$ is a finite isometry (i.e a rotation and translation $x'=Rx-a$ what is the fourier tra...
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Curves with infinitely many integral points consecutive Fibonacci numbers up vote 1 down vote favorite I suspect the Granville-Langevin conjecture implies this. Let $F(x,y)=0$ be a curve with infinitely many integral points $(F_n,F_{n+1})$. Is it true that either $x^2+x y - y^2 -1$ or $x^2+ x y -y ^2 +1$ divides $F(...
5
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Equation of circle September 25th 2010, 07:56 AM #1 Super Member Joined Dec 2009 Posts 755 Equation of circle Find the equation of the circle with passes through the points $(0,1)$ and $(3,-2)$ and has its centre lying on the line $y=x-2$ If the point $(a,b)$ is the center then $r=\sqrt{(0-a)^2...
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Formalizing Euclid's proof of the infinitude of primes up vote 10 down vote favorite 2 Euclid's proof of the infinitude of primes requires me to take an arbitrary finite set of primes and multiply them together. If I want to formalize this proof in Peano Arithmetic, I need to know that any finite set of numbers has a ...
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Are maximal Cohen-Macaulay modules supported everywhere? up vote 0 down vote favorite 1 Let $A$ be a local CM ring, and $M$ a maximal CM $A$-module. Is it true that $\operatorname{Supp}M=\operatorname{Spec}A$ ? This suspicion stems from such statements as: • If $\omega$ is a canonical module of $A$, then $\omega_{\...
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Cubic Polynomial June 23rd 2010, 05:25 AM rtblue Cubic Polynomial A Cubic Polynomial with integral coefficients has a root $(3-4i)$ and possesses the form: $y=x^3+ax+b$ Find AB/25 Have no clue where to start with this one. Any help is appreciated. June 23rd 2010, 05:41 AM Ackbeet If you know one...
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Surface Integrals April 11th 2009, 10:58 AM #1 Junior Member Joined Mar 2009 Posts 32 Surface Integrals Hi, is the formula for ds equal to $<br /> ds = sqrt(( (pz/px)^2 + (pz/py)^2 + 1))$ where p = partial derivative many thanks Problem: For the parametrically defined surface...
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Posts about Hash function on The Pseudo Random Bit Bucket In Pcompress, I have implemented a variant of the rolling hash based Content Defined Chunking that provides both deduplication accuracy and high performance. This post attempts to explain the chunking process, covers the chunking computations that are done in Pc...
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I can not get the answer from the book could you please explain November 14th 2008, 07:45 PM #1 I can not get the answer from the book could you please explain Estimate the volume in metric units and compute the acual volume of the item: Oil in a barrel that has a height of 1 m and a diameter of 0.5m Th...
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Subset Sum March 27, 2012 Instead of a matrix, we use a hash table; that way we don’t have to figure out all the sums ahead of time. Here’s the code: (define (subset-sum xs t) (let ((h (make-hash identity = #f 99991))) (let loop1 ((xs xs)) (if (null? xs) #f (let loop2 ((ys (cons (cons 0 (list)) (h 'enlist)))) (cond ...
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What is the probability that two numbers are relatively prime? up vote 7 down vote favorite 1 The basic question that I have is in the title, but let us make it more rigorous below. Let $N=\{1, 2, ..., n\}$, and put the (normalized) counting measure, $\mu_n$, on $N\times N$. Let $\mathcal{S}_n= \{ (a, b)\in N\times ...
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Rates of change July 12th 2009, 11:16 PM #1 Junior Member Joined Sep 2008 Posts 73 Rates of change Sand being poured from a conveyor belt forms a cone with height h and a semi-vertical angle of 60 degrees. Let the volume of the sand is $\pi h^3$. Suppose that the sand is being poured at a constant r...
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Characterization of amenable actions up vote 5 down vote favorite 2 Let $(X,\mu)$ be a $G$-space, i.e. a measure space with a Borel quasi-invariant $G$-action. Say that $X$ is amenable (equivalently, that the action is amenable) if there is a $G$-fixed point in every affine space over $X$ with an $\alpha$-twisted acti...
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Sample and Population Standard Deviation Date: 03/03/2001 at 11:18:08 From: Lara Brook Subject: Standard deviation What letters represent theoretical and 'real' standard deviation, mean, and variance? Date: 03/05/2001 at 10:22:11 From: Doctor Jordi Subject: Re: Standard deviation Hello, Lara - thanks for writing ...
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integration by substitution xe^x^2 October 5th 2008, 09:44 PM #1 Member Joined Jun 2008 Posts 175 integration by substitution xe^x^2 Question is to calculate the integral $\int\limits_0^2 {xe^{x^2 } dx} =$ This is what I have done, however looks to be incorrect. I let $u = e^{x^2 }$ and so...
5
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Geometric progression? April 28th 2009, 05:29 AM #1 Geometric progression? If $a_{i}\in\mathbb{R}, i = 1,2,3,...N$and all $a_{i}\ 's$ are distinct such that: $\left(\sum_{i = 1}^{n - 1} a_{i}^2\right)x^2 + 2\left(\sum_{i = 1}^{n - 1} a_{i}a_{i + 1}\right)x + \sum_{i = 2}^{n} a_{i}^2\leq 0$ ,then show that...
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Permutation Groups April 25th 2012, 07:55 PM #1 Newbie Joined Apr 2012 From USA Posts 1 Permutation Groups Hi everyone, I could really use some help with this problem: Let H be the subset of S[3] consisting of all the permutations that leave the element 2 fixed. (i) Prove that H is a s...
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Domain and Range October 20th 2011, 09:47 PM #1 Domain and Range Hi, I'm just wondering if I'm correct and also what notation I should use here. The question is asking for the domain and range of $f(x,y)=e^{y-x^2}$ I think the domain is $Domain \subset R^2$ and $Range>0$ Thanks for your help. ...
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Area between two curves May 17th 2008, 08:42 PM casemeister Area between two curves Find the area of the regions by the lines and curves given below. $y= 8cos(x)$ and $y = sec^2(x)$ between $\frac{-\pi}{3} \leq x \leq \frac{\pi}{3}$ May 17th 2008, 08:53 PM o_O First notice that the curves both inters...
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integral (partial fraction) find $\int \frac{4 x^2 + 10 x + 24}{(x - 5)(x^2+4)} dx$ $\frac{4 x^2 + 10 x + 24}{(x - 5)(x^2+4)} = \frac{A}{x - 5} + \frac{B x + C}{x^2+4}$ $4x^2+10x+24 = A(x^2+4)+(Bx+C)(x-5)$ I was able to find A by: $170 = A(29), A= 6$ need help finding B and C
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integral with radical and trigonometry September 27th 2013, 10:06 AM infraRed integral with radical and trigonometry Is there anyone who could walk me through this practice problem?: $\int{\sqrt{1 + \frac{cosx}{sinx}}}\,dx$ I really struggle with integrals involving radicals or trigonometry. September...
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Data Management Problem Help July 17th 2008, 01:35 PM #1 I know I may be asking too much on this one, but please hear me out. I'm taking a data management course in summer school, summer school is only 3 weeks long. So basically, I'm learn a large amount of material everyday for six hours, material that would ...
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quadratic equation from amazing lil boy November 25th 2007, 11:01 AM pitt quadratic equation from amazing lil boy hi there i want help with this quadratic equation.. im quiet young.. so try to explain it step by step so i can understand :) y= 2x3+3x+19 p.s. the first 3 is squared can someone ident...
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Bijections Date: 04/28/2003 at 13:08:03 From: Mandy Subject: Bijections Find a bijection from (0, 1) to (0, 1]. (Be sure to prove that your function has the proper properties.) Date: 04/28/2003 at 16:52:15 From: Doctor Rob Subject: Re: Bijections Thanks for writing to Ask Dr. Math, Mandy. The trick here is to pic...
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Integrated Rate Laws CAcT HomePage Integrated Rate Laws This is a continuation of Rate and Order of Reactions Skills to develop • Apply either the differential rate laws or integrated rate laws to solve chemical kinetic probl...
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Complete Residue Systems Problem May 21st 2010, 04:46 PM 1337h4x Complete Residue Systems Problem Hello everyone, I have a question on complete residue systems that I do not understand. 1. Are there any twin primes (like 11 and 13, or 3 and 5) of the form (2^n)-1, (2^n) +1, for n > 2? If there are, do ...
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Another Goodness of Fit test....GRRRR August 18th 2008, 08:08 PM #1 Newbie Joined Jul 2008 Posts 5 Another Goodness of Fit test....GRRRR I'm so confused with this goodness of fit stuff. I'm trying to solve the following problem...can anyone help?? The safety director of Honda USA took samples at ran...
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Splitting of primes in cubic fields with limited ramifications. up vote 4 down vote favorite 3 Let $\mathbb{F}$ be a cubic field, i.e, $\mathbb{F} = \mathbb{Q}(\alpha)$ where $\alpha$ is a root of a cubic irreducible polynomial over $\mathbb{Q}$, satisfying $disc(\mathbb{F}/\mathbb{Q})$ is a prime or a power of a prim...
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Solving simultaneously involving logs. July 18th 2009, 11:23 PM smmmc Solving simultaneously involving logs. 1) 52=x*10^m 2) 80=x*10^3m my attempt from 1) rearrange to get x=52/10^m then sub into 2) so 80=52/10^m * 10^3m so log 10(80) = log10(52) - log10(10^m) + log10(10^3m) ...
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Probability Problem in a Lewis Carroll Book Date: 12/13/2008 at 18:09:24 From: James Subject: Probability problem in a Lewis Carroll book In Lewis Carroll's "A Tangled Tale" he asks the following: "Say that 70 per cent of a group of soldiers have lost an eye — 75 per cent an ear — 80 per cent an arm — 85 per cent a ...
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Norm inequality for stochastic maps up vote 1 down vote favorite I know that if $\Lambda$ is a stochastic positive linear map, i.e., $\Lambda(I) = I$, it is true that \[ \|\Lambda(B)\| \leq \| B \| \] For any operator $B$, where $\|\cdot\|$ is the standard operator norm $\|B\| := \max_{|v|= 1} |Bv|$. Is it true for ...
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Prove if 7 divides x^3+y^3+z^3 then it also divides xyz October 24th 2012, 06:11 AM #1 Junior Member Joined Nov 2011 From Karachi Posts 36 Prove if 7 divides x^3+y^3+z^3 then it also divides xyz Hello guys! We are to prove that if 7 divides $x^3+y^3+z^3$, then it also divides $xyz$. How do we go...
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Is there a natural distance between skew hermitian matrices? up vote 2 down vote favorite Working in machine learning, I try to find a way to compare time series, which can be considered as semi-continuous matrices belonging to $\mathbb R^{n \times \mathbb R}$ (a column corresponds to n-dimensional the value of the ti...
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Need help solving some 2nd order DEs August 14th 2009, 08:03 AM #1 Newbie Joined Aug 2009 Posts 1 Need help solving some 2nd order DEs Hi to everyone. I need help. I have few equations that i can not solve. If there is anyone that can help...please solve them step by step. I need them as fast as posible....
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Conversion of Pure Recurring Decimal into Vulgar Fraction | Worked-out Examples Conversion of Pure Recurring Decimal into Vulgar Fraction Follow the steps for the conversion of pure recurring decimal into vulgar fraction: (i) First write the decimal form by removing the bar from the top and put it equal to n (any var...
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Integrating factor on Exact, Homogeneous DE September 12th 2011, 03:26 PM #1 Junior Member Joined Aug 2010 Posts 41 Integrating factor on Exact, Homogeneous DE Problem: $y*(1+x)+2xy'=0$ I have rearranged the equation to put it in exact form, resulting in the equation: $(y+xy)dx+2xdy=0$ Afte...
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closed curve, trace January 27th 2010, 06:11 PM #1 Newbie Joined Dec 2008 Posts 17 closed curve, trace Let $\gamma$ be a closed path in a domain $D$ such that $W(\gamma, \zeta)=0$ for all $\zeta ot \in D$. Suppose that $f(z)$ is analytic on $D$ except possibly at a finite number of isolated singulari...
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Decomposition of an abelian von Neumann algebra up vote 1 down vote favorite 1 Hi, I came across the statement below and I couldn't figure out why it is true. I was hoping someone could explain it or give me a good reference. Thank you in advance. "Let $\pi$ be a non-degenerate representation of a separable C*-algebra...
4
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Partitions of n into non-negative powers of 2. October 21st 2008, 08:21 PM #1 Member Joined May 2008 From Melbourne Australia Posts 210 Thanks 23 Partitions of n into non-negative powers of 2. 10. (Solved) Let b(n) denote the number of partitions of n into non-negative powers of 2. Prove that...
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Rings and Fields query November 23rd 2007, 01:07 PM musicmental85 Rings and Fields query Hi, Just trying to work on my rings and fields. If its not too much trouble could someone explain how to do this for me? Its not so much a solution I'm looking for as the method as I really need to understand it ...
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Transformation Matrix From Math Images A transformation matrix is a special matrix that can describe 2d and 3d transformations. Transformations are frequently used in linear algebra and computer graphics, since transformations can be easily represented, combined and computed. Computing Transformations If you have a...
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Finding First Derivatives by Definition Associated Topics || Dr. Math Home || Search Dr. Math Finding First Derivatives by Definition ...
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Joint PDF May 6th 2009, 04:35 AM #1 Junior Member Joined Nov 2008 Posts 45 Joint PDF The joint probability distribution is given by, $f_{(X,Y)}(x,y) = 2$ if $0 \leq x \leq y \leq 1$, 0 otherwise. (i) Determine the marginal density functions of X and Y. Check that it is indeed a pdf. (ii) C...
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Solving Equations - using addition property February 19th 2006, 02:40 PM #1 Obviously I don't know what I'm doing here. The book gives an answer of -8, so any hints on where my method is flawed would be appreciated. z + 9 = 1 z + 9 = + (-1) = 1 + (-1) z + 8 = 0 z = -1 Euclid Alexandria Ob...
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Prove that E is disconnected November 25th 2011, 04:41 PM wopashui Prove that E is disconnected Prove that a closed subset E of a metric space (M,d) is disconnected iff there exists disjoint nonempty closed sets E1, E2 such that E=E1UE2. for the --> direction, we have E is disconnected, then by definition t...
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Continued Fractions October 21st 2007, 03:22 PM #1 Newbie Joined Sep 2007 Posts 11 Continued Fractions Hello, I can't seem to understand how to use continued fractions to find the value of x in: x^2 + x - 72 = 0 Can someone please explain how to solve this problem? Basically, I need to prove that x ...
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This Linear Equation Answer Can't be Correct November 5th 2012, 02:49 AM #1 Junior Member Joined Oct 2012 From Australia Posts 26 This Linear Equation Answer Can't be Correct Linear Equation: 7x+5/3=11 Answer: x=4/3 ... I'm not getting that answer and don't know in which step I went wrong. Can s...
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Poisson's My watch list my.chemeurope.com my.chemeurope.com With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter. • My watch list • My saved searches • My saved topics • My newsletter Poisson's ratio When a sampl...
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[ 0.004974365234375, -0.054443359375, -0.06298828125, 0.00469970703125, 0.0218505859375, -0.08447265625, 0.0498046875, 0.06982421875, 0.060546875, -0.0537109375, 0.04248046875, 0.0296630859375, 0.0250244140625, 0.0634765625, 0.00160980224609375, -0.0673828125, 0.0281982421875, -0.004...
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Magnetic Fields Produced by Currents: Ampere’s Law Magnetic fields have both direction and magnitude. As noted before, one way to explore the direction of a magnetic field is with compasses, as shown for a long straight current-carrying wire in Figure 1. Hall probes can determine the magnitude of the field. The field a...
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Orthocenter May 19th 2008, 01:58 PM tehc0ffee Orthocenter Heres the problem : Given triangle RST, with R= (-3,2), S=(4,5) , T= (7,-2), find the cords of the orthocenter. I have no idea what to do, my teacher gave this to us and im confused.. thanks (: May 19th 2008, 02:12 PM Incendiary Quote: ...
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How can I tell if a variety is normal? up vote 12 down vote favorite 3 Suppose $R$ is a subalgebra of ${\mathbb C}[x_1,...,x_N]$ generated by polynomials $p_1,...,p_k.$ I know that ${\mathbb C}[x_1,...,x_N]$ is the integral closure of $R$. Is there an algorithm to determine if $R={\mathbb C}[x_1,...,x_N]$ which would ...
4
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Modular representation theory: central idempotents in $\mathbb{Z}_p[G]$ up vote 7 down vote favorite 3 Let $G$ be a finite group and let $p$ be a prime dividing the order of $G$. Let $\chi$ be a $\mathbb{C}_p$-valued irreducible character of $G$ and let $e_{\chi} = |G|^{-1}\chi(1)\sum_{g \in G} \chi(g ^{-1})g$ be the ...
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how to calculate final velocity of car September 17th 2011, 06:49 PM moonnightingale how to calculate final velocity of car If a car accelerates uniformly from rest at 3.2m/s(2). when the car has traveled a distance of 40. meters, its speed will be. I tried to use equation v-u/a= t but there r two...
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Introduction to Linear and Exponential Growth Date: 11/04/2003 at 19:12:07 From: Christina Subject: Exponentially Growth As a biology project, Nicole is investigating how fast a particular beetle population will grow under controlled conditions. She started her experiment with 5 beetles. The next month she counted ...
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Valuation Criterion of Properness, (Irreducible) Varieties up vote 3 down vote favorite Greetings, (I suspect this question has nothing to do with the Valuation Criterion of Properness, but I don't know for sure - feel free to modify my title) This question arises in section 2.4 of Fulton's book on Toric Varieties -...
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an easy particle problem July 13th 2010, 07:49 PM #1 Newbie Joined Jul 2010 Posts 23 an easy particle problem Hi, just want to double check my answers and how it is set up! My prof. grades HW very harshly :/ V(t)=t^2-2t-8 1(<=) t (<=) 6 I did this using definite integrals. Thanks ye...
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symmetric difference Hello, $A \Delta B=(A \cup B) \backslash (A \cap B)$, this is according to the definition you're given. It is pretty obvious that it is commutative, by commutativity of $\cap$ and $\cup$. As for associativity, you have to prove that $(A \Delta B) \Delta C=A \Delta (B \Delta C)$. Just use the defini...
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Calculus test questions September 7th 2010, 01:49 AM johnsy123 Calculus test questions 1) The curve with equation y=f(x) passes through the point (3,-1) and f '(x)=2x+5. find f(x). 2) find s in terms of t, if ds/dt=t+3-1/t^2 and s=6 and t=1. September 7th 2010, 01:53 AM Prove It 1) $f'(x) = 2x + 5...
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What is the cohomology of this complex? up vote 4 down vote favorite 1 I have a feeling that this may be a very easy question for some people on MO, but it isn't for me. Take a finite pointed set $X$, with $*$ the base-point. Build a cosimplicial set which in degree $n \ge 1$ is $X^n$ (the cartesian product of $n$ co...
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Linear Algebra Primer: Part 3- Basis, Span, Linear Algebra Primer: Part 3- Span, Basis, and Dimension This tutorial will focus on the concepts of span, basis, and dimension. Graph theory analogues will also be discussed in the context of basis. Attached is a LaTeX typeset version for those who would prefer to view t...
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Square Root Proof Problem June 23rd 2008, 07:23 PM cryptocrow Square Root Proof Problem Hi. I'm having trouble with these problems. p is and odd prime for both. Prove x = 0 mod p if x = -x mod p. Prove x = +/-y mod p^2 if x^2 = y^2 mod p^2, neither x nor y are 0 mod p. Thanks... June 23rd 20...
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[Numpy-discussion] Interpolation via Fourier transform M Trumpis mtrumpis@berkeley.... Thu Mar 5 13:51:44 CST 2009 Hi Nadav.. if you want a lower resolution 2d function with the same field of view (or whatever term is appropriate to your case), then in principle you can truncate your higher frequencies and do this: ...
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Normal subgroups of the Galois group MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. I am trying to teach myself Galois theory. Is it true that every for a field extension K->L, that every normal subgroup of Gal(L:K) is of ...
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word problem I claim 103138 divides that number for all positive integer values of n. This is done by observing that $a-b$ divides $a^n - b^n$ and then rearranging the given number into sums of such differences. For example, $278 = 2141-1863$ and $-278 = 1492 - 1770$ Thus $278|2141^n -1863^n + 1492^n - 1770^n$ Similarl...
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Finding equation of Tangent. April 3rd 2010, 09:48 AM #1 Newbie Joined Apr 2010 From Reading, Berkshire. Posts 5 Finding equation of Tangent. The curve y = √8x + 1 and the tangent at the point P(3,5) on the curve. This tangent meets the y-axis. Find the equation of the tangent at P. Can anyone p...
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Isotropic subspaces in cohomology up vote 5 down vote favorite 3 Hello, Here is a problem I encountered in the study of Kähler manifolds but there is a natural generalisation of this for topological spaces. If $X$ is a topological space, denote by $g_\mathbb{R}$ the real genus of $X$, that is the maximal dimension of...
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Trigonometry and Complex Exponentials Amazingly, trig functions can also be expressed back in terms of the complex exponential. Then everything involving trig functions can be transformed into something involving the exponential function. This is very surprising. In order to easily obtain trig identities like , let's ...
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Explicit description of the "simplicial tensor product" of chain complexes up vote 7 down vote favorite 3 Recall that there is an equivalence of categories (Dold-Kan) $$N:\mathrm{s}\mathbf{Ab}\simeq \operatorname{Ch}_{\geq 0}(\mathbf{Ab}):\Gamma$$ between simplicial abelian groups and (connective) chain complexes, whe...
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Galois Groups vs. Fundamental Groups up vote 44 down vote favorite 54 In a recent blog post Terry Tao mentions in passing that: "Class groups...are arithmetic analogues of the (abelianised) fundamental groups in topology, with Galois groups serving as the analogue of the full fundamental group." Can anyone explain t...
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A brief vector question March 1st 2009, 12:23 AM #1 Junior Member Joined Mar 2009 Posts 66 A brief vector question This vector question has three parts, and I've done the first two, finding the point of intersection and acute angle between them. It's the third bit I don't understand. L1 = 2i-j+3k + ...
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Independence of rotated spherical harmonics up vote 0 down vote favorite 1 Hi, Consider a spherical harmonic of degree $l$, denoted by $y_l^m$. I rotate this harmonic using $2l+1$ different rotations. The set of functions I get is not an orthogonal set, but the functions are still harmonics. The question is: does thi...
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BEATCALC BEATCALC: Beat the Calculator! Back to Calculation Tips & Tricks ┏━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━...
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MMSE estimator expressed through cumulants up vote 0 down vote favorite I have a linear model $$Y=HX+N,$$ where $H$ is a matrix and $X$ are drawn from $p_X(X)$, and $N$ is Gaussian noise variates. Now, if $X$ is multivariate Gaussian, then a linear estimator $\hat{X}=A+BX$ solves the problem $$\mathcal{E}(|\hat{X}-X|...
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Yr 10 Maths Level 1:Quadratics Investigation August 17th 2008, 01:52 AM #1 Newbie Joined Aug 2008 Posts 1 the equation is h=-0.4 d^2 + 2d. h=height above water, d=horizontal distance. Q1) how high above the water is the dolphin when it has travelled 2 m horizontally from its starting point? ...
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Kronecker-Weber false for number fields distinct from $\mathbb{Q}$ up vote 1 down vote favorite 1 Keith Conrad's History of Class Field Theory notes has a comment that given any number field $K\neq \mathbb{Q}$, then $K$ has an abelian extension which is not contained in $K(\zeta_\infty)$, so the Kronecker-Weber theore...
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Discrete Mathematics Project Index Discrete Mathematics Project Counting Techniques/Probability Activity Title "What's In the Bag?" (Jim Arnow) Goals ...
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Find a and b where a, b \in\mathbb{Z}^+ 1. June 22nd 2010, 05:31 PM #1 Find a and b where a, b \in\mathbb{Z}^+ $gcd(a,b)=20 \ \mbox{and} \ lcm(a,b)=840$ What is an easy, efficient way to do these sort of problems? 2. June 22nd 2010, 06:05 PM #2 $20=2^2\cdot5$ and $840=2^3\cdot3\cd...
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Econometrics by Simulation Original Code * A frequent assumption in economics is that the coefficient that is being estimated is constant throughout the population. * That is, the effect of the exogenous variable is the same for all individuals. * This assumption is implicit in the notation: * Y = XB + u * Because...
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Voids - H.J. Rood Annu. Rev. Astron. Astrophys. 1988. 26: 245-294 Copyright © 1988 by . All rights reserved 3.2. Theoretical Studies 3.2.1. DYNAMICAL EVOLUTION OF VOIDS A typical void has a radius R[v] ~ 25 Mpc and a sharp contiguous shell of superclusters with a non-Hubble velocity (assumed outward relative to...
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Negative Gromov-Witten invariants up vote 9 down vote favorite 5 I understand the heuristic reason why Gromov-Witten invariants can be rational; roughly it's because we're doing curve counts in some stacky sense, so each curve $C$ contributes $1/|\text{Aut}(C)|$ to the count rather than $1$. However, I don't understa...
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Reduction to single higher-order linear ODE June 30th 2012, 05:53 PM #1 Newbie Joined Jun 2012 From canada Posts 12 Reduction to single higher-order linear ODE I need to reduce the following system to a single higher-order linear ODE for y x'(t) - y'(t) + z(t) = 0 x(t) + y'(t) - z'(t) = 1 ...
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arithmetic seq. ! July 14th 2006, 01:04 PM #1 Member Joined Sep 2005 Posts 136 please help ! Which one of the basic functions (linear, quadratic, rational, or exponential) is related to the arithmetic sequence? Which one of the basic functions (linear, quadratic, rational, or exponential) is related ...
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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: Product with elementary methods Replies: 2 Last Po...
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Math Help February 9th 2010, 05:22 PM #1 Member Joined Nov 2009 Posts 81 Hi I am find it hard to figure this series out? Would anyone have any ideas? 1 +2/3+ 8/15 + 48/105 +384/945+ 3840/10395 + 46080/135135 + 645120/2027025 +10321920/34459425+... Last edited by hebby; February 9th 20...
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Karolyi's theorem for finite groups and its extensions up vote 1 down vote favorite Suppose that $\mathbb A = (A, +)$ is a (possibly non-commutative) group, and denote by $p(\mathbb A)$ the minimum of $|S|$ as $S$ ranges in the set of non-trivial subgroups of $\mathbb A$, with the convention of taking $p(\mathbb A) :=...
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First Order Differential March 11th 2013, 01:49 PM #1 Member Joined Jan 2011 Posts 88 First Order Differential $2r(s^2+1)dr+(r^4+1)ds=0$ This is the second question in the textbook and I am able to do every question after it, so perhaps there is something simple that I am not seeing? The answer has ...
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Diferentiation How do you differentiate function like x^(1/4) or x^(3/5) ect? Given $f(x)= x^{\alpha}$, where $\alpha$ is an arbitrary real or even complex constant, its derivative by definition is... $\displaystyle f^{'}(x) = \lim_{\delta \rightarrow 0} \frac{(x+\delta)^{\ alpha} - x^{\alpha}}{\delta}$ (1) Now is... ...
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vertices of a square, coordinate geometry and differentiation January 5th 2012, 10:20 PM furor celtica vertices of a square, coordinate geometry and differentiation The origin O and a point B(p, q) are opposite vertices of the square OABC. Find the coordinates of the point A and C A line l has gradient q/p. ...
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2-class group of a quadratic imaginary extension up vote 1 down vote favorite 2 Let $p\equiv 5 [8]$ be a prime number, and consider $K=\mathbb{Q}(\sqrt{-p})$. I would like to check that the $2$-Sylow subgroup of the class group $C_K$ has order $2$ (I'm pretty sure it's true). Apparently, this can be done using genus...
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can you colve for x? First note that 256=4^4 so we change the question into $4^{x-x^2}=\frac{1}{(4^4)^x}=\frac{1}{4^{4x}}$ Multiply both sides by $4^{4x}$ to get $4^{4x}\cdot 4^{x-x^2}=1$ $4^{4x+x-x^2}=1$ $4^{5x-x^2}=1$ And we need the exponent to be 0 since $x^0=1$ (you can take the log of both sides, but log 1=0 so w...
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Math Help Question: If $f(r)=r(r+1)(r+2)$, find $f(r+1)-f(r)$ and deduce that $\sum_{r=1}^nr^2=\frac{1}{6}n(n+1)(2n+1)$ My solution: $f(r+1)-f(r)$ $=(r+1)(r+2)(r+3)-r(r+1)(r+2)$ $=(r+1)(r+2)[(r+3)-r]$ $=3(r+1)(r+2)$ $=3r^2+9r+6$ Let, $u_r= f(r+1)-f(r)$ $u_r=3r^2+9r+6$ ...
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Space of Morphisms of Vector Spaces (Linear Transformations) AUTHOR: A VectorSpaceHomspace object represents the set of all possible homomorphisms from one vector space to another. These mappings are usually known as linear transformations. For more information on the use of linear transformations, consult the docum...
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[SOLVED] Sum of divisors May 18th 2010, 01:49 PM #1 [SOLVED] Sum of divisors Let $k$ denote the number of positive divisors of the positive integer $n$, and $S$ the sum of the positive divisors of $n$. Show that $k\sqrt{n} < S < \sqrt{2k}n$ Last edited by Bruno J.; May 18th 2010 at 02:17 PM. we al...
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Derivation of Kinetic energy formula and worked examples Where there are no opposing forces, a moving body needs noforce to keep it moving with a steady velocity ( Newton's first law of motion ). If, however, a resultant force does act on a moving body in the direction of its motion, then it will accelerate ( Newton's ...
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Conservapedia Chain rule From Conservapedia $\frac{d}{dx} \sin x=?\,$ This article/section deals with mathematical concepts appropriate for a student in late high school or early university. The chain rule in calculus is a formula for determining the derivative of a composite function: $f(g(x))' = f'(g(x))\tim...
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Changing the orientation of a Landweber exact cohomology theory up vote 4 down vote favorite 1 Let the ring R be a MU[*]-module via a ring homomorphism φ and suppose it satisfies the condition of the Landweber exact functor theorem such that we obtain a cohomology theory $R^*(-) := R \otimes_ {MU_*} MU^*(-)$. If ω den...
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Homogeneous Linear Differential Equations Date: 05/06/2001 at 11:29:06 From: Tim Subject: Solving linear differential equations Hi, I have a couple of questions on solving differential equations of higher order. (note: the " ' " in y' stands for the first derivative of y(x). I do know calculus. How would one solve...
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help...inductive proof??? February 16th 2008, 07:44 AM #1 Newbie Joined Feb 2008 Posts 8 can someone help me how to prove this...? Prove by induction that the number of 2-subsets of an n-set A equals n(n-1)/2. [hint: Let x be any object of A and B=A-{x}. Then a 2-subset of A is either a 2-subset of B...
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[ -0.037353515625, 0.005096435546875, 0.12890625, 0.00946044921875, 0.0230712890625, 0.002166748046875, 0.042724609375, 0.04833984375, -0.04833984375, -0.02294921875, -0.10986328125, -0.0888671875, 0.07666015625, -0.07373046875, 0.01104736328125, 0.109375, 0.04736328125, -0.058105468...
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Optimum Design of Space Trusses with Buckling Constraints by Means of Spreadsheets Turk J Engin Environ Sci 25 (2001) , 355 – 367. ¨ ˙ c TUBITAK Optimum Design of Space Trusses with Buckling Constraints by Means of Spreadsheets ...
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[ 0.0211181640625, 0.0751953125, -0.050537109375, -0.08984375, -0.0634765625, -0.07177734375, -0.031982421875, 0.1376953125, -0.04443359375, 0.07080078125, -0.030029296875, 0.0157470703125, 0.07666015625, -0.0036773681640625, -0.04736328125, 0.0576171875, -0.004150390625, 0.024780273...
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