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recurrence relation October 14th 2013, 05:35 PM #3 Newbie October 14th 2013, 05:09 PM #2 MHF Contributor October 14th 2013, 03:42 PM #1 Newbie Re: recurrence relation I notice that you answered my previous thread too and I'm really appreciated.However, your work seems beyond the method my professor have taug...
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Spectrum of the Laplacian on G(n, p) and G(n, M) up vote 6 down vote favorite 1 A random graph in $G(n, p)$ model is a graph on $n$ vertices in which for each of the $n\choose{2}$ edges we independently flip a coin, then take the edge with probability $p$ or remove it with $1 - p$. A random graph in $G(n, m)$ model i...
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Periodic automorphisms of free groups up vote 6 down vote favorite Hi, I am troubled with the following question: Does there exist a finite order automorphism of a free group, $f\in Aut(F)$, such that it fixes no non trivial conjugacy class and no non trivial centralizer, i.e. $f(g)$ is not conjugate to $g$ and $f(g)\...
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Solve this radical equation Solve in R : $\sqrt {x - 1} + \sqrt {2 - x} = x^2 - 3x + 3$ Square both sides. You'll end up with a radical as the middle term on the right-hand side. Isolate this radical, and then square again. Then solve the resulting polynomial. Remember to check your solutions in the original radical e...
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Series representation of x^2/(a^3-x^3) February 9th 2010, 08:33 PM buckeye1973 Series representation of x^2/(a^3-x^3) Hi all, I'm having trouble with the series representation of a function. $f(x) = \frac{x^2}{a^3-x^3}$ First I tried breaking this up into partial fractions, then I realized I'm not...
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Birthday Paradox March 16th 2010, 08:51 PM jrkevinfang1234 Birthday Paradox Apparently, there are two methods of solving this probability problem. The first, using p(n) = 1 - (365^n falling / 365^n) makes sense to me; however, there is an alternate solution using the Taylor series of e^x. Here's the ful...
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Relational proof March 12th 2009, 07:27 PM thehollow89 Relational proof If R is reflexive and transitive, then R U R^U is an equivalence. I need to prove this using algebraic-relation calculations or disprove by counter example. I'm really not understanding this stuff. (Worried) March 13th 2009, 02:42 AM P...
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Alternative proof of unique factorization for ideals in a Dedekind ring up vote 5 down vote favorite 3 I'm writing some commutative algebra notes, but I'm facing a difficulty in organizing the order of the topics. I'd like to have the topics about factorization before speaking of integral closure. This is fine, as lon...
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Check if everything is OK in the way I have solved this problem? February 15th 2013, 07:37 AM #1 Newbie Joined Jan 2013 From South Africa Posts 14 Check if everything is OK in the way I have solved this problem? Can you please just look this over like peer review? I think I am fairly confident about ...
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[SciPy-user] Maximum entropy distribution for Ising model - setup? [SciPy-user] Maximum entropy distribution for Ising model - setup? Martin Spacek scipy at mspacek.mm.st Sat Oct 28 07:23:36 CDT 2006 Hi James, Bear with me, I don't exactly have a complete understanding of this. James Coughlan wrote: > Hi, > > I've...
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Help required in a formula December 20th 2007, 01:41 AM tpriyan Help required in a formula Hello all, x = [(a-b(1+i)^-n)*y] / [(1-(1+i)^(n-y))/i)+y]. i need to get the reverse formulae for a,b,i,n and y. i need this information urgently. please help. Thanks in Advance Priyan December 20th 20...
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von dyck groups and solvability up vote 7 down vote favorite 4 A von Dyck group is a group with presentation $< a,b | a^m=b^n=(ab)^p=1 >$ with m,n,p natural numbers. Is it known which of these groups are solvable and which are not? Is there a reference for this? Thanks. gr.group-theory 1 The groups with $\frac{1}...
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Sine, cosine and tan graphs April 29th 2007, 12:23 PM #1 Newbie Joined Feb 2007 Posts 16 Sine, cosine and tan graphs I'm having a lot of problems with this topic. I know what the sine, cosine and tan graphs look like. one question i come across fequently is "given that sin 30Β°, what is a) sin 150Β° b...
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Orbits in modular arithmetic up vote 8 down vote favorite 5 Let $p$ be an odd prime number and consider the set of $p-2$ integers that is $\mathbb{Z}_p$ minus 0 and 1. Next define two bijective functions on this set f(x) &= 1-x \mod p and g(x) &= x^{-1} \mod p \qquad \text{(the multiplicative inverse of $x$).} One can...
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Topology. Metric Space. You have posted an attachment without any comment whatsoever. Do you expect someone to do the problem(s) for you? Each of these follows from this theorem: $(\forall x,~y)\left[|D(A,x)-D(A,y)|\le d (x,y)\right]$ The proof follows directly from the definition: $D(A,x)=\inf\{d(x,a):~a\in A\}~.$ Not...
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Some questions on unitarisability of discrete groups up vote 13 down vote favorite 5 In this post I would like to ask several of questions related to Dixmier problem. I will try to make the post as self-contained as possible. A discrete group $G$ is unitarisable if for every Hilbert space $H$ and a homomorphism $\pi:...
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trig word problem help The problem is attached to the post I really dont know how to turn that into a graph to a): Use the definition of Cosine: $\dfrac wd = \cos(x)~\implies~d=\dfrac w{\cos(x)} = w\cdot \sec(x)$ to b): $\min(x) = 0~\implies~d = w$ If P = L then $\max(x) = \arctan\left(\dfrac{2w}w\right)=\ arctan(2) \...
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Summation Notation Problem How could this be simplified in summation notation: 5 * y1 + 25 * y2 + 125 * y3 Thanks! Welcome to the forum (Party) $5 \times y^1 + 25 \times y^2 + 125 \times y^3$ $(5\times y)^1 +(5\times y)^2 + (5\times y)^ 3$ $<br /> \sum_{r= 1}^{3}{(5\times y)^r} <br /> <br />$ Thanks, ADARSH. What abo...
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A system of cross and dot products October 27th 2010, 10:12 AM #1 Junior Member Joined Oct 2009 Posts 72 A system of cross and dot products This was found in a textbook on classical mechanics so I thought it best to post it here rather then in the calc forum. $\bold{b}\cdot\bold{v}=\lambda$ $\bo...
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Vector Calculus March 28th 2009, 02:26 PM #1 Junior Member Joined Feb 2008 Posts 63 Vector Calculus Show that if $\sigma$(x,y) satisfies Laplace's equation, $\frac{\partial \sigma}{\partial x^2}+\frac {\partial \sigma}{\partial y^2}=0$ on a simply connected region R, then $\forall$closed curves C of...
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Fast Multiplication Algorithms for Large Integers Date: 08/16/97 at 11:51:31 From: Richard Eager Subject: Fast Multiplication Algorithms for Large Integers I am wondering if there are any 'elementary' algorithms for computing the product of 2 n-digit numbers in less than O(n^1.58) time (that is an algorithm from Knu...
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Question on subspace 1. June 6th 2012, 12:03 AM #1 2. June 6th 2012, 01:20 AM #2 Re: Question on subspace I assume the question deals with vector spaces over real numbers. Is W closed under multiplication by a real number? 3. June 6th 2012, 03:16 AM #3 Re: Question on subspace Yes, it is...
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probability of IID sum being positive up vote 6 down vote favorite Let $X_1,X_2,...$ be iid random variable with mean zero. If $X_1$ has second moment then by the CLT we have $P(X_1+X_2+...+X_n\geq 0)\rightarrow \frac{1}{2}$, as $n$ goes to infinity. I am curious about whether does this hold without the second moment ...
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Rigorous proof of the duality of Coupon collector's problem and Occupancy problem up vote -1 down vote favorite 1 We have $k$ different types of coupons (with replacement).If we collect at least $l$ different coupons, we win a prize. We can only afford to collect $m$ coupons. Let's say we take all those $m$ coupons, ...
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help me solve this indices ASAP!! Help me to solve this thx :D Evaluate 6^x , given that 3^(x+1)*2^(2x+1)=2^(x+2) Question: Given that $3^{x+1}\times2^{2x+1}=2^{x+2}$, Required to find $6^x$ Solution: first of all simplify each index; $3^{x+1}\times2^{2x+1}=2^{x+2}$ $\Rightarrow 3^x.3^1\times2^{2x}.2^1=2^x.2^2$ $\Righ...
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Side Length of a Regular Octagon, Without Trigonometry Date: 09/19/2003 at 17:12:28 From: Gail Subject: Finding the length of the side of an octagon I teach middle school math. A friend asked me how to find the length of one side of a regular octagon that has a (side-to-side) diameter of 16 feet. I was not sure how...
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Ring of charge February 4th 2011, 11:56 AM #1 Newbie Joined Nov 2010 Posts 17 Ring of charge Problem 9. The electric field vanishes inside a uniform spherical shell of charge because the shell has exactly the right geometry to make the 1/r2 field produced by opposite sides of the shell cancel acc...
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Wavefront Reconstruction of Elevation Circular Synthetic Aperture Radar Imagery Using a Cylindrical Green's Function Elevation Circular Synthetic Aperture Radar (E-CSAR) is a novel radar modality used to form radar images from data sets acquired along a complete or even a segment of a cylindrical geometry above a given...
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Graphs of Functions Help By Steven G. Krantz β€” McGraw-Hill Professional Updated on Aug 31, 2011 Introduction to Graphs of Functions It is useful to be able to draw pictures which represent functions. These pictures, or graphs , are a device for helping us to think about functions. In this book we will only graph f...
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Enthalpy Change Example Problem β€’ Enthalpy Review You may wish to review the Laws of Thermochemistry and Endothermic and Exothermic Reactions before you begin. β€’ Problem Given: The heat of fusion of ice is 333 J/g (meaning 333 J is absorbed when 1 gram of ice melts). The heat of vaporization of liquid wat...
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what is the dy of a trigonometric function March 10th 2013, 06:42 AM dokrbb what is the dy of a trigonometric function Sorry for posting the same thread, but the last one I described in such a confusing way even for me (no wonder I had no reply), so, starting with a clean sheet: The function y = tan(3x +...
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Math Forums @ Math Goodies - Solving Polynomial Equationstesting headertesting left navtesting footer Math Goodies is a free math help portal for students, teachers, and parents. ...
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Homomorphism, kernal, image February 8th 2011, 03:53 PM #1 Homomorphism, kernal, image Let $f: (\mathbb{R}, +) \rightarrow (\mathbb{C}, \times )$ be the map $f(x) = e^{ix}$. Show that $f$ is a homomorphism and determine its image and kernal. Okay, so this seems somewhat easy, but I am fairly new to this conc...
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Infinity and Imaginary Numbers Date: 06/15/2003 at 13:25:44 From: Brandon Subject: Infinity and Imaginary Numbers I've been thinking about both of these concepts and their possible connections. I would like to know if these ideas are currently established as valid or not. To start with I see _i (the imaginary number...
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Finding The Distance Between Parallel Lines...? April 29th 2008, 07:30 PM #1 Member Joined Apr 2008 Posts 123 Finding The Distance Between Parallel Lines...? How do you find the distance between the two parallel lines: y = 4x+6 y = 4x-9 A lot of people think it's 15, which sounds plausible,...
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intersecting lines September 9th 2009, 03:27 AM #1 Junior Member Joined Aug 2009 Posts 25 intersecting lines Given the intersecting lines: L1: x = 3t - 3, y = -2t, z = 6t + 7 L2: x = s - 6, y = -3s - 5, z = 2s + 1 a) Find the (acute) angle, rounded to the nearest degree, between the lines. b...
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Trig Functions (Angles subtended?) Last edited by MathIsPower; May 30th 2007 at 01:30 PM. Hello, the shaded area can be calculated by: area of sector - area of right triangle The angle(ROP) = $\frac{3 \pi}{16}$ Thus the area of the sector is: $\frac{A_{sector}}{\pi r^2}=\frac{\frac{3 \pi} {16}}{2\pi} \ \Longleftrighta...
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Sets: Unions and Intersections Date: 12/17/97 at 19:04:03 From: Alison Lawless Subject: Unions and Intersections I want to know about complements, union, intersection, and sets of numbers. I am having much trouble! Please send some advice. I would appreciate it very much. Thank you so much! Alison and her mothe...
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type of exponential equation To solve $2^x = x^5$ could you use Lambert W function? Thanks Last edited by tukeywilliams; July 29th 2007 at 08:57 PM. It can be solved via derivatives and intersections of curves. But how would you solve it in a purely algebraic manner using the W Lambert function? In principle yes it ...
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Condition number of simple eigenvalues May 16th 2011, 09:25 AM Mollier Condition number of simple eigenvalues Hi, there's a step in the derivation of the condition number that I do not understand. Let $A\in\mathbb{C}^{n\times n}$ and let $\lambda$ be a simple eigenvalue of $A$. Let $u$ be a right eigenv...
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[SOLVED] equation of a tangent line November 4th 2007, 04:27 PM #1 Newbie Joined Nov 2007 Posts 6 Having a little bit of problem.... Let c be a nonzero real number. What is the equation of the tangent line to the graphof the function y=sin(x/x+c) at the point x=0. i get the derivate of cos(1/1+c)...
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A question about connectedness in Euclidean space up vote 0 down vote favorite Here is a question which seems true to me but I can't rigorously show. Suppose $K$ is a compact subset of $\mathbb{R}^n$ such that $\mathbb{R}^n\setminus K$ is connected, does it follow that for any connected open set $U\subset \mathbb{R}^n...
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Help with question on matrices April 11th 2012, 12:19 AM Jane1947 Help with question on matrices Hello My daughter is doing a college assignment and I managed to help her with the majority of the question but cannot figure out the last part. I have the characteristic equation and have made that a cubic ...
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Ratio of Sides and Ratio of Areas Date: 02/11/99 at 00:45:40 From: Danny Bradley Subject: High school Geometry The corresponding sides of two similar triangles are in the ratio of 1:7. What is the ratio of their areas? Date: 02/11/99 at 18:17:50 From: Doctor Pat Subject: Re: High school Geometry Danny, When two ...
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Maclaurin Polynomial December 8th 2010, 06:23 AM hmmmm Maclaurin Polynomial How do we find the maclaurin polynomial for $f(x)=\left\{\begin{array}{cc}\frac{cos(x)-1}{x},&\mbox{ if }xot= 0\\0, & \mbox{ if } x=0\end{array}\right,$ Its not the maclaurin polynomial part that i dont understand its how i different...
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Generating a group May 10th 2010, 09:37 AM #1 Newbie Joined May 2010 Posts 3 Generating a group Please oh please help me finish this 1,000,000 < 2^20 Know that until you have a generating set, you can show that you keep adding elements so the prodcuts of each subset are different. Prove by...
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Adding Integrals and Velocity Function April 23rd 2010, 06:08 AM #1 Newbie Joined Apr 2010 Posts 3 Hello All- I was having some difficulty with the below problem. ∫ from 0 to 3 [f(x)] dx = 6 ∫ from 3 to 5 [f(x)] dx = 4 Find the ∫ from 0 to 5 [ 3 + 2f(x)] dx My thought was that the...
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On the construction of the simplicial category $\Delta$ up vote 2 down vote favorite 2 Is a classical example that in the topos $Set$ the set of natural numbers (finite cardinals) $\mathbb{N}$ is the natural-numbers objet as in topos theory definition. Now the category $\Delta$ has for objects the natural numebers ($n...
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Conditional probabilities for all pairs of subsets in $\mathbb R^2$? up vote 3 down vote favorite Parikh and Parnes showed that one can define a isometry-invariant finitely-additive conditional probability for all pairs of subsets of the interval. Can one extend this result to bounded subsets of $\mathbb R^2$? Of cour...
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Vector question 2- October 28th 2006, 12:34 AM #1 Junior Member Joined May 2006 Posts 37 Vector question 2- The line L passes through the point A, whose position vector is i-j-5k and is parrallel to the vector i-j-4k. The line l2 passes through the point B, whose position vector is 2i-9j-14k, and is ...
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central extensions of Diff(S^1) and of the semigroup of annuli up vote 15 down vote favorite 10 $\mathit{Diff}(S^1)$ refers to the group of orientation preserving diffeomorphisms of the circle. The semigroup of annuli $\mathcal A$ is its "complexification": the elements of $\mathcal A$ are isomorphism classes of annul...
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Show Function Satisfies Equation November 25th 2010, 08:46 AM #1 Newbie Joined Nov 2010 Posts 3 Show Function Satisfies Equation 1) Assuming that f(0) = 0, show that f(n) = n * (n+1) / 2 satisfies the equation: f(n) = n + f(0) + f(n-1) 2) Show that g(n) = n log n, satisfies the equation: g...
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$J$-holomorphic curve as a minimal surface up vote 4 down vote favorite 1 The following is a part of the proof of Gromov nonsqueezing theorem. The existence of a $J$-holomorphic curve gives an upper bound for the radius of a symplectically embedded ball. Let $\psi: B(r) \rightarrow M$ be a symplectic embedding of a b...
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Help With Lagrange Multipliers 2 Questions November 16th 2011, 05:30 PM #1 Senior Member Joined Sep 2009 Posts 299 I need help with these two questions 1. Use Lagrange multipliers to show that, of all the triangles inscribed in a circle of radius R, the equilateral triangle has the largest pe...
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Does this Make sense? 1. September 22nd 2008, 02:51 PM #1 2. September 22nd 2008, 03:11 PM #2 Try using powers in parentheses. This expression is equivalent to $((a/b) \cdot x)^{1/2}$ where $x = ((b/a) \cdot (a/b)^{1/2})^{1/2}$. Let's evaluate x. $x = ((a/b)^{-1}...
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Complex Numbers Date: 03/11/2003 at 06:41:57 From: Shawn Yapp Subject: Complex Numbers z^4 + z^3 + z^2 + z + 1 = 0 This is a question the class got asked to factorise. Not even the teacher could get it! Please show me how to get the solution. Date: 03/11/2003 at 12:23:27 From: Doctor Douglas Subject: Re: Complex N...
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Does anyone want a pretty Maass form? up vote 30 down vote favorite 11 A few months ago, I was curious about some properties of Maass cusp forms, of nonabelian arithmetic origin. As a result, I went through a somewhat predictable process of finding a totally real $A_4$ extension of $Q$, lifting the resulting projectiv...
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Circle and Walking Problem March 26th 2007, 03:41 PM #1 Circle and Walking Problem Thee friends--whose walking rates are 1ft./sec, 3ft/sec, and 6ft./sec--start out together walking in the same direction around a circular track that is 300 feet in circumference. After how many minutes are the three of them tog...
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Solve √3 cosxtanx+ cosx=0 , where 0≀x<2(Pi) You can factor out $\cos(x)$ to give $\cos(x)(\sqrt{3}\tan(x) + 1) = 0$ Hence either $\cos(x) = 0 \text{ or } \sqrt{3}\tan(x)+1=0$ Thanks both of you, but i am still having issues. I'm doing a practice provincial exam for Pmath 12 and I haven't done this stuff in half a year...
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Word problem on quad. equation September 28th 2009, 06:25 AM Ilsa Word problem on quad. equation on a journey of 250 km, a driver calculated that by increasing his average speed, by 5 km/h, he would take 25 minutes less. find his usual average speed , correct to 2 dec. places. Ans: 52.33 km/h i really ...
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Stochastic Processes December 8th 2009, 03:10 AM #1 Junior Member Joined Dec 2009 Posts 30 Exponential Distribution Suppose three particles are particle projected, P, Q and R. Each particle is projected once. The projection is modelled as an exponentially distributed random variable. Assuming that the av...
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3 Calculus Problems January 7th 2007, 10:45 AM asnxbbyx113 3 Calculus Problems If x^2+y^2=8100 and dy/dt=3, find dx/dt when y=72. A man starts walking north at 5ft/s from a point P. Five minutes later, a woman starts walking south at 4ft/s from a point 1300ft due east of P. At what rate are the people movin...
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Finding a Formula for Mixtures Date: 11/10/2003 at 21:41:56 From: Gaye Subject: algebra story problem Alfredo needs to make 250 ml of a 27% alcohol solution, using a 15% solution and a 40% solution. How much of each should he use? Date: 11/11/2003 at 12:57:35 From: Doctor Ian Subject: Re: alegebra story problem H...
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set of all finite subsets of a continuum has cardinality continuum February 3rd 2010, 07:02 PM minivan15 set of all finite subsets of a continuum has cardinality continuum Hi. I'm learning about equivalent sets in a real analysis class and am struggling a bit with the abstractness of it. Would someone be able to...
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al CombinePvals - combining probabilities from independent tests of significance into a single aggregate figure use CombinePvals; my $obj = CombinePvals->new ($reference_to_list_of_pvals); my $pval = $obj->method_name; my $pval = $obj->method_name (@arguments); There are a variety o...
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how to show the eigenvalues of a jacobi matrix. To find the eigenvalues, you need to evaluate $\Delta_n := \det(B-\lambda I)$. Expand along the top row to see that $\Delta_n = (a-\lambda)\Delta_{n-1} - bc\Delta_{n-2}$. Thus $\Delta_n$ satisfies the difference equation $\Delta_n - (a-\lambda)\Delta_{n-1} + bc\Delta_{n-2...
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Remainder Theorem May 24th 2009, 10:06 AM #1 Newbie Joined Dec 2008 Posts 9 Remainder Theorem Hi, Im having troubles in understanding how to solve these two equations and how to divide them. a) (2x^3 + 5x^2 - 2x - 3) / (x +1) b) (2x^3 - 7x^2 + 16x - 22) / (2x - 3) Hello, What do you m...
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Quadratic Concepts -- Different Types of Solutions to Quadratic Equations The heart of the quadratic formula is the part under the square root: b2βˆ’4acb2βˆ’4ac size 12{b rSup { size 8{2} } - 4 ital "ac"} {}. This part is so important that it is given its own name: the discriminant. It is called this because it discriminat...
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the area of a triangle in a rectangle November 17th 2009, 04:43 AM #1 Newbie Joined Nov 2009 Posts 3 the area of a triangle in a rectangle Hi all! Not sure if it's the right part of the forum, but: Rectangle PQRS with Triangle PTV T between Q and R, V between R and S PQ=10m, PS=12m , TR=xm...
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Asymptotics of a one-parameter family of Schwartz functions up vote 1 down vote favorite For $\tau > 0$ define $\theta_{\tau}(x) = e^{\tau(x-x^{2})}$. I am curious about the asymptotics of $\widehat{\theta}_{\tau}(\tau)$, that is $\int_{\mathbb{R}} e^{\tau(x - x^{2})}e^{-2\pi i \tau\cdot x}dx\ \sim\ ?\ \ \ \ \ \ \ \ ...
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Is there an approach to understanding solution counts to quadratic forms that doesn't involve modular forms? up vote 13 down vote favorite 6 Given a quadratic form Q in k variables, there is an associated theta series $$\theta_Q(z) = \sum_{x\in \mathbb{Z}^k}q^{Q(x)}$$ where $q = e^{2\pi i z}$ which is a modular form o...
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Help with an inequality. October 2nd 2008, 07:57 PM #1 Junior Member Joined Sep 2008 Posts 40 Help with an inequality. $3\ln2<2\ln(x)<2\ln3$ Express the solution x as a set using the notations ( Can anyone help me out? EDIT: Please don't skip any steps that may seem arbitrary to you =] tha...
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help me find the ordered pairs for (x,y)∈r if 3 divides x-y (relations) January 17th 2013, 01:08 PM #1 Newbie Joined Jan 2013 From CO Posts 7 help me find the ordered pairs for (x,y)∈r if 3 divides x-y (relations) i need to figure out relations, and to that we were taught to find ordered pairs and t...
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Finding 'a' given two summations November 18th 2012, 02:55 PM #1 Newbie Joined Nov 2012 From Surrey Posts 10 Finding 'a' given two summations I've been stuck on how to do this question for over an hour. I clearly don't understand how to do it, hopefully somebody can help explain this to me? Give...
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Limits This is an experiment in using the World Wide Web to illustrate the intuitive notion of limits in functions of two variables. If you have access to a browser that supports tables, you may prefer to view the Netscape version. To say that z = f(x,y) has a limit L as (x,y) approaches (a,b) means that ...
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Rate of change problem March 9th 2010, 05:49 PM #1 Junior Member Joined Mar 2010 Posts 36 Rate of change problem So the whole problem is: If $f$ is the focal length of a convex lens and an object is placed at a distance $q$ from the lens, then its image will be at a distance $p$ from the lens, wher...
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LOVE/HATE MODELING Modeling of Love-Hate relationships (See programLOVE&HATE) See: Strogatz S.H., Love Affairs and differential equations, Math. Magazine, 61,35,1988. Lets imagine a Romeo (R) and Juliet (J) "troubled" romance, where: R(t)=Romeo's Love/Hate for Juliet at time t J(t)= Juliet's Love/Hate for Romeo at ...
4
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Differentiation - First Principles Find the derivative of 1 / square root of 2x from first principles. hellp ! xx Quote: when you see "from first principles" they are talking about using the definition of the derivative. there are two (equivalent) definitions: $f'(x) = \lim_{h \t...
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The consistency of Martin's Axiom up vote 10 down vote favorite 2 In learning about the Consistency of Martin's Axiom through Kunen and Jech with help from other set theorists, I have come to a basic question about marrying these proofs: What is the connection between the nice names argument in Kunen and the boolean ...
4
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Vectors, problem with variables October 17th 2010, 04:27 AM #1 Member Joined Mar 2010 Posts 96 Vectors, problem with variables We have three vectors, a = (1,2,3) b = (2,-1,x) c = (y,z,1). We need to find x, y and z, if the vectors are right-angled. I am trying to solve it with the dot product. I kno...
4
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How Many of Each Ticket Were Sold? Date: 09/06/2001 at 02:59:52 From: Sarah Kromer Subject: Turning a word problem into an equation Five hundred tickets were sold for a play, for $8 at the lower level and $6 at the upper level, totaling $3600. How many of each were sold? I am having trouble putting this into an equ...
4
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Finding closest point on line to a point February 2nd 2010, 11:24 AM Geomagnet Finding closest point on line to a point http://www.geomagnet.net/test/math.jpg I have been going bonkers trying to figure out what I'm doing wrong. I am using the proper formula to get the point on a segment which is tangent...
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Little Proof June 23rd 2010, 03:26 PM #1 Junior Member Joined Jan 2010 Posts 43 Little Proof Hi I'm reading this great book Foundations of Analysis by Edmund Landau, a really old book that aims to build the foundations of analysis from basic arithmetic. I'm not that strong on proofing yet but am try...
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Derivatives/Integrals, properties of sin/cos July 19th 2008, 11:29 PM #1 Junior Member Joined Jul 2008 Posts 51 Derivatives/Integrals, properties of sin/cos Q: ΚƒΚƒ cos (x +2y) dy dx where 0 < x < pi; 0 < y < pi/2 When I integrate cos(x+2y) wrt y, do I get sin(x+2y)/2? How do I evaluate sin(x + pi)? ...
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Limits using Trig Functions September 22nd 2008, 04:17 AM #1 Newbie Joined Sep 2008 Posts 4 Can someone help me with this: Find the limit if the limit exists: lim x-tanx x->0 sinx lim 1 - sine^2 (1)^2 x->-2- t (t) Can someone help me with this: Find the limit if the limit exists: ...
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Help needed on two questions! December 11th 2010, 10:05 AM NFS1 Help needed on two questions! Hi, i have recently been trying to complete an assignment of 10 mathematical questions. I have managed to answer 8 of the 10 questions but unfortunately have been unable to answer two. Can some please show me how to...
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Solve: e^x = 4 sin x May 5th 2010, 03:21 PM mathnerd501 Solve: e^x = 4 sin x Solve the equation, e^x=4sinx ; x is greater than 0, less than 2pi. how do i figure this out, and i have my ti-83 with me. May 5th 2010, 03:28 PM surjective equation Hello, If you use your TI-83, you could simply punch ...
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exponential problem $\begin{gathered}<br /> 3^{4x} 3^{ - x - 2} = 3^3 3^{ - 2x} \hfill \\<br /> 3^{3x - 2} = 3^{3 - 2x} \hfill \\<br /> \Leftrightarrow 3x - 2 = 3 - 2x \hfill \\<br /> \Leftrightarrow x = 1 \hfill \\ <br /> \end{gathered} <br />$ I think I got it: Rewrite all of the terms as base 3: 9^(2x) = (3^2)^(2x)...
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help me in this kind of questions June 21st 2009, 10:14 AM #1 Newbie Joined Jun 2009 Posts 5 help me in this kind of questions please solve this question and also show the steps of solution 1) Lim x->0 x^(2sinx) ie lim x tends to 0, x to the power 2sinx 2) is L-hospitals rule valid for 0 t...
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Elastic modulus, earthquake waves? February 1st 2009, 11:29 AM #1 Elastic modulus, earthquake waves? A longitudinal earthquake wave strikes a boundary between two types of rock at a 35 degree angle. As it crosses the boundary, the specific gravity (SG = d_rock / d_water ) of the rock changes from 3.7 to 2.8. ...
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Intersecting group orbits, version 2 up vote 2 down vote favorite 2 This question follows up a previous question, Intersecting group orbits. Suppose a group $G$ acts transitively on a set $X$ of $n$ elements, where $n$ is even, and consider the induced action on the set $\binom{X}{n/2}$ of subsets of $X$ of size $n/2...
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Free subgroups vs law up vote 13 down vote favorite 5 Consider the following two conditions for a group $G$: (1) $G$ does not satisfy a nontrivial law. (2) $G$ contains a non-abelian free subgroup. Obviously (2) implies (1) and it is easy to construct torsion groups that do not satisfy any law (e.g., the direct pr...
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Existence of nonnegative solutions to an underdetermined system of linear equations up vote 0 down vote favorite Similar questions have been asked elsewhere, but I think this is sufficiently different to warrant a new post. I have a particular matrix $A$ and would like to know when the system $Ax = 0$ has at least one...
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Hawking radiation: pure and thermal mixed states are a micron away I think that the recent paper by Raju and Papadodimas ( arXiv ) is the most convincing and least confusing paper about the black hole information available to the infalling observer that has been written on this planet so far. However, I also th...
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inverse trig integration:two methods=two diff ans HELP!! April 1st 2008, 04:35 PM i_zz_y_ill inverse trig integration:two methods=two diff ans HELP!! Q is whats the integral of (3)divided by(9x^2+6x+5) with no limits.... ...method 1. ..............9( x^2 + (2/3)(x) + (5/9) ) =9( (x^2 + 1/3 )^2 + 4/9 ) ...
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Which monoidal categories are equivalent to their centers? up vote 6 down vote favorite 1 Let $\mathcal C$ be a monoidal category. Recall that the (Drinfel'd) center of $\mathcal C$ is the braided monoidal category $Z(\mathcal C)$ with: β€’ Objects: pairs $M \in \mathcal C$ and $\mu: M\otimes(-) \overset\sim\to (-)\o...
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Matrix Proof January 18th 2009, 12:09 PM #1 Member Joined Jan 2009 Posts 91 Matrix Proof Determine the typical (j kth) entry in A*A^T and the typical entry in A^T * A Explain why it follows that if A*A^T or A^T * A is the zero matrix, then A = 0 Since we are able to multiple $A A^t$ and $A^t A$ ...
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pigeonhole principle up vote 5 down vote favorite 2 Hi everyone I saw a question on Mathoverflow asking for some applications of pigeonhole principle, among the answers I saw a problem set which was proposed by Prof. Richard Stanley and in this problem set there was a question which I am interested on it, here it is...
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[ -0.03662109375, -0.007537841796875, 0.029296875, -0.047119140625, -0.059326171875, 0.061279296875, 0.0634765625, -0.002593994140625, -0.03662109375, -0.0556640625, -0.0986328125, 0.0164794921875, 0.058837890625, -0.02197265625, -0.059814453125, 0.125, 0.12353515625, -0.04296875, ...
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Derivative of 3x^2+6x+5/Sqrt(x) in any case just use the formula d(x^n)/dx = nx^(n-1) also remember derivative of sum or difference of functions is sum or difference of derivatives. ie., ( u+/- v)' = u' +/ - v' Your answer is not right. You can approach this in either of two ways: 1. Divide the denominator into the nu...
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[ 0.0167236328125, -0.010986328125, 0.053466796875, 0.0191650390625, -0.051025390625, -0.07275390625, -0.0166015625, -0.056884765625, 0.033935546875, 0.00135040283203125, 0.0240478515625, -0.023193359375, -0.04833984375, -0.04248046875, -0.06982421875, -0.017822265625, 0.020263671875, ...
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speed July 4th 2007, 09:32 AM twistedmexican speed (a) A car traveling at a speed of v can brake to an emergency stop in a distance x. Assuming all other driving conditions are all similar, if traveling speed of the car doubles, the stopping distance will be (1) √2x, or (2) 2x, or (3) 4x: (b) a driver travel...
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[ 0.0279541015625, 0.0228271484375, 0.041015625, -0.0341796875, 0.0634765625, 0.0498046875, -0.053466796875, 0.1103515625, -0.01416015625, 0.06201171875, 0.109375, -0.023681640625, 0.0224609375, 0.000537872314453125, -0.048095703125, 0.037109375, 0.0262451171875, -0.050048828125, -...
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