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Bounded Set Date: 06/24/2003 at 13:57:27 From: Saint Monday Subject: Proof about a bounded set Let S be a set of real numbers. Prove that the following are equivalent: (a) S is bounded, i.e. there exists a number M > 0 such that abs(x) <= M for every x in S. (b) S has an upper bound and lower bound. I need to ...
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Formula for 1+(1+2)+(1+2+3)+(1+2+3+4)+... OReilly Yes, I presume you have a finite sum. --- The key in the the fact that, $1+2+...+x=\frac{x(x+1)}{2}$ --- Therefore, that entire sum is, $\frac{1(2)}{2}+\frac{2(3)}{2}+...+\frac{n(n+1)}{2}$ Thus, $\sum_{k=1}^{n}\frac{k(k+1)}{2}=\frac{1}{2}\sum_{k= 1}^n k^2+k$ Thus, subdi...
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Derivatives of Inverse Trigonometric Functions January 14th 2010, 06:01 PM #1 Junior Member Joined Oct 2009 From Bloomington, IN Posts 29 Derivatives of Inverse Trigonometric Functions Hello, and thanks in advance for your help. I need to find the derivative of this problem, but am at a loss as ...
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have answer, need equation... November 27th 2005, 10:18 AM #1 Newbie Joined Nov 2005 Posts 3 have answer, need equation... OK, I have a points system where I can have up to 1.3billion points. I need to find a way to convert the points into percentages. I found a way to come up with the points, but I have...
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Fourier Theory Problem July 5th 2010, 06:10 AM #1 Newbie Joined Jul 2010 Posts 2 Fourier Theory Problem Is anyone able to prove, or provide a counter example to the following: let $f(t)$ be a non-negative function, then the Fourier transform of $f(t)$, $F(\omega)$ say, takes its maximum absolute val...
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Eigenvectors July 1st 2008, 06:00 PM jschlarb Eigenvectors I've calculated the following eigen value and determined the following matrix: eigenvalue, U= -5 Original matrix ([-5-U] 2 -3) (0 [1-U] -2) (0 1 [4-U]) Solved Matrix: (0 0 28)0 (0 3 -1)0 (0 0 0) 0 I'm not exa...
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Standard Form of a Line Date: 04/23/2002 at 22:48:05 From: Tricia Swanson Subject: Standard Form What is standard form? What does Ax+by = c mean and what do the letters stand for? Date: 04/24/2002 at 23:05:27 From: Doctor Peterson Subject: Re: Standard Form Hi, Tricia. This is what is sometimes called the "standa...
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Math Help March 24th 2009, 11:51 AM #1 Newbie Joined Mar 2009 Posts 22 Polynomial I have the polynomial $f(x) = x^4-10x^2+1$ over $\mathbb Q$. It can be easily seen that Klein's Four group is the Galois group of this polynomial. How can I show that the corresponding polynomial $g(x) \in \mathbb ...
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CD random order problem March 30th 2009, 12:50 AM #1 Newbie Joined Mar 2009 Posts 7 CD random order problem Hi, I was listening to a CD a week ago in random playback. At one point three of the tracks played in the correct order (24 tracks on the CD). For example: 8, 4, 17, 10, 11, 12, ... ...
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Related rates and how fast the height of a pile's increasing? June 20th 2011, 03:12 PM #1 Newbie Joined Jun 2011 Posts 4 Related rates and how fast the height of a pile's increasing? The question: Gravel is being dumped from a conveyor belt at a rate of 40 cubic feet per minute. It forms a pile in t...
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Isomorphism of a surjective group homomorphism December 7th 2008, 04:09 PM tttcomrader Isomorphism of a surjective group homomorphism Let p be a prime and let $\mathbb {Z} (p^ \infty ) = \{ \hat { \frac {a}{b} } \in \frac { \mathbb {Q} }{ \mathbb {Z} } : a,b \in \mathbb {Z} \ , \ b=p^i \ , \ i \geq 0 \}$. P...
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Chances of Winning the Lottery - for Dummies ;-) Understand Your Chances Of Winning The Lottery In 5 Minutes Flat Most lottery players fail to make the best of their chances of winning the lottery. Because normally, understanding your lottery winning chances involves more maths than most of us ever did at school -- an...
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Special divisor function summation Take the 2-minute tour × MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. What is a good upper bound for $$\sum_{d\leq z} \mu(d)\frac{\tau(d)}{d}$$ where $\tau(d)$ is the divisor function? nt.number-theory B...
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What is the left adjoint for taking rows of a bisimplicial set? up vote 0 down vote favorite Let $aSS$ / $abSS$ be the category of augmented bi/simplicial sets (one can also consider $SS$/$bSS$ be the usual bi/simplicial sets, the results should related in some reasonable way.) There is an obvious functor $n$-th row ...
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Quadratic function and exponential function question! March 30th 2008, 11:23 AM bubblegum Quadratic function and exponential function question! hi, it's me again. Thanks so much for the help last time. :) i have this table of values: x | y 1 | 20 3 | 320 i have to make a linear, quadratic, ...
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harvard A Sharp for the Chang Model William Mitchell wjm@ufl.edu University of Florida February 19...
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Pigeonhole problem Prove that there exists a positive integer n so that 44^n — 1 is divisible by 7. There's no real need for a pigenhole principle here (look for little Fermat's theorem), but let's do it your way. Consider the eight numbers $44^0,44^1, 44^2,\ldots,44^7$. There are only 7 possible remainders in the div...
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Equation with 3 unknow February 24th 2013, 08:27 PM blackjack21 Equation with 3 unknow hi all my question is; A,B and C is one-digit number different from 0 and each other 200A+40B+10A^2+AB+90C=2600 Actually the extended form was 300A+40B=2000 10A^2+AB-10C=300 100C-100A=300 ...
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C++ help? September 17th 2008, 09:10 PM amor_vincit_omnia C++ help? I need to write a program that sums, term by term, the following poylnomial. p(x) = 1 + x + x^2 + x^3 + x^4 + ... + x^38 when x = 0.5 Here's the code I did, but the answer is completely wrong, lol: #include <iostream> usi...
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Help with steady-state unemployment March 30th 2010, 06:27 AM #1 Newbie Joined Mar 2010 Posts 3 Help with steady-state unemployment Hello, I am a first year econ student, trying to work through Mankiw's Macroeconomics 7th edition textbook. However, I have run into a problem that I cannot seem to fin...
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Help in polynomial division April 24th 2009, 07:44 AM #1 Help in polynomial division Hello , i am posting anything here for first time.....I am from India, and in XIth Standard presently. I do have some trouble in division of polynomial by another polynomial but without using long division method and applica...
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Trig Substitution Problem February 10th 2011, 09:08 AM #1 Member Joined Apr 2010 Posts 81 Trig Substitution Problem $<br /> \int_0^{7 \sqrt{3}/2} \sqrt{49 - x^2} \, dx<br />$ This problem really made me depressed.. Heres what I did: $<br /> let x=7sin\theta, dx=7cos\theta, \theta=\arcsin(\f...
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Maximum stress and bending moments September 7th 2013, 05:09 AM #31 Junior Member Joined Sep 2013 From texas Posts 73 Re: Maximum stress and bending moments Is it 8.3 for this one because of the reaction at the right hand support which is 8.3? Or why are you saying to use 8333? I used 8.4 which was t...
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calc 3, local maxes and mins October 16th 2009, 03:18 PM #1 Member Joined Nov 2008 From MD Posts 165 find the points on the ellipsoid x^2 + (y^2)/4 + (z^2)/9 =1 that are closest to the origin i'm not sure how to go about solving this problem. it has to do with maxes or mins i'm guessing sinc...
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[SOLVED] Compound angle formulas - Finding exact values. April 19th 2009, 11:36 AM #1 Newbie Joined Apr 2009 Posts 6 [SOLVED] Compound angle formulas - Finding exact values. I am rather confused as to how to go about doing this problem. Evaluate using formulas developed in this section. $tan(-\f...
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Joint pdf of standard normal and chi sq. August 8th 2009, 04:12 AM #1 Junior Member Joined May 2009 Posts 25 Joint pdf of standard normal and chi sq. $X_{1},...,X_{N}$ is a random sample from a $N(\mu,\sigma^2)$ distribution, where $\mu$ and $\sigma$ are unknown. I'm given: $Z = \frac{\sqrt{n}(...
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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: Whatever the distribution, no matter the statistic...
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Math Forum: Teacher2Teacher - Q&A #7499 Teacher2Teacher Q&A #7499 Teachers' Lounge Discussion: Curious about fractions ...
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More Parametric March 13th 2008, 06:09 PM #1 Junior Member Joined Feb 2008 Posts 48 More Parametric Use the parametric equations of the ellipse x=5cos(theta), y=7sin(theta) to find the area enclosed by the ellipse for (-5*radical 3)/2, less than or equal to x, less than or equal to (5*radical 3)/2 ...
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EconPort - Online Resources Showing results for: Economic Category: Game Theory Jump to section: 2. Experience from a Course in Game Theory: Pre and Post-Class Problem Sets as a Didactic Device This is a revised version of my paper with the same title published in Games and Economic Behavior, 28 (1999), 155-170. The...
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Reduction formula problem.. February 5th 2014, 06:13 AM #1 Junior Member Joined Feb 2010 Posts 37 Can someone help me with this question.. For the integral $\int{\frac{1}{( x^2 + 1 )^n}} dx$ prove the reduction formula : $I_{n} = \frac{1}{n-2} . \frac{x}{(x^2+1)^{n-1}} + \frac{2n - 3}{2n-2}I_{n-1...
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Is it true that all the "irrational power" functions are almost polynomial ? up vote 4 down vote favorite Hello all, the $\Delta$ operator on functions $\mathcal{N} \to \mathbb{R}$ (where $\mathcal N$ denotes $\lbrace 1,2, \ldots , \rbrace$ )defined by $\Delta(f)(n)=f(n+1)-f(n)$ is well-known and it is not very hard t...
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Simplifying Log. Problem March 2nd 2010, 07:27 AM Savior_Self Simplifying Log. Problem Hey guys. Alright, here's the problem: (not sure how to do log base 3 in LaTex.. so log.3 = log base 3) Expand as the sum of individual logarithms, each of whose argument is linear. Simplify your answer: $log.3(\fr...
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Finding Surface Areas Date: 06/17/2002 at 18:35:28 From: Megz Subject: Measurement. I don't understand the formulas to figure out surface area on the different kinds of figures. It is really confusing to me, and hard to explain about what I don't understand. It's basically the whole thing about it. Megz Date: 06/1...
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Conic hulls and cones up vote 6 down vote favorite 2 Suppose I have a number of vectors in $\mathbb{R}^n.$ The first question is: what is the most efficient algorithm to compute their "conic hull" (the minimal convex cone which contains them)? The next question is: suppose I have a number of vectors $v_1, \dotsc, v_n,...
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Polynomial and derivative problem March 21st 2007, 04:03 PM #1 Newbie Joined Mar 2007 Posts 2 Polynomial and derivative problem Hello everyone, this is the exact question what I have so far is that: P'(x)= 3ax^3 + 2bx^2 + c Then from what I understand P'(0)=0 so then: P'(0)=0=...
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Changing the subject of a formula August 8th 2010, 08:21 PM PythagorasNeophyte Changing the subject of a formula A very good day everyone. I am urgently requesting for your help for this taxing mathematics questions, all relating to algebra (changing the subject of a formula). If you could help me to explain...
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f and e^f have no common pole? February 1st 2010, 06:23 AM #1 Senior Member Joined Jul 2009 Posts 254 f and e^f have no common pole? Prove that an isolated sigularity of $f(z)$ cannot be a pole of $e^{f(z)}$. I know the key is to prove that $f$and $e^f$have no common pole, but how?? Hello! Here ...
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ur Theory & Definitions Last Modification: February 17, 2013 Connecting a measurement instrument in the right way only is one thing. But, to determine the correct parameter needs more considerations. Very important is the question: For what purpose do I do this measurement? Performing a current measurement to examine...
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logarithms December 18th 2007, 08:01 PM #1 Junior Member Joined Nov 2007 Posts 41 logarithms I think this is supposed to go here...anyways.. I need help with this log. Solve for x 5^(2x) - 5^(x) - 20 = 0 please and thank you...I've been stuck on it for a half hour now. Hello, ...
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Is Mertens function negatively biased? up vote 2 down vote favorite 2 A comment in OEIS about Mertens function claims: The graph seems to show a negative bias for the Mertens function which is eerily similar to the Chebyshev bias (described in A156749 and A156709). The purported bias seems to be empirically a...
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What is the mean in this problem? July 6th 2010, 11:07 AM #1 Newbie Joined Jun 2010 Posts 9 What is the mean in this problem? In a particular basketball league, the standard deviation in the distribution of players' height is 2 inches. Twenty- five players are selected at random and their heights...
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The mathematical theory of Feynman integrals up vote 47 down vote favorite 28 It is well known that Feynman integrals are one of the tools that physicists have and mathematicians haven't, sadly. Arguably, they are the most important such tool. Briefly, the question I'd like to ask is this: what are the existing propos...
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Fractal Tiling of Rhombic Dodecahedra up vote 8 down vote favorite 2 Hello, this is my first question on Math Overflow... Rhombic dodecahedra can be tiled in 3-space, leaving no gaps. This tiling corresponds to the close-packing of spheres. Consider a "nucleus" rhombic dodecahedron ("rd") surrounded by 12 rd's, such...
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how to find maximum and minimum points for this equation? November 29th 2009, 10:11 AM #1 Newbie Joined Nov 2009 Posts 19 how to find maximum and minimum points for this equation? can anyone please help me with finding the maximum and minimum points for this equation?? (pi)x^2 + 4(pi)^2.x^2 - 28(pi)...
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Math Help March 25th 2009, 12:01 PM #1 Newbie Joined Mar 2009 Posts 1 Identities It's been a while since my last math class, and my current teacher isnt the greatest. We're assigned a fair amount of homework everynight, and it just takes me forever to do it, and its taking all of my time, leaving no...
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circle problem.. • circle problem.. In the attached figure, AB//OC, <ABC=130, Find x,y. • Hint: let angleBAO = z x + y = 130 - 2z • • • • Ya, good question Archie. I don't think it's possible that they are parallel, with AD being diameter and C...
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Can a continuous, nowhere differentiable function have specified "shape" at every point? up vote 7 down vote favorite 2 I'm a bit embarrassed to admit that: a) This is a rather unmotivated question. b) I can't remember whether or not I've asked this before, but searching doesn't seem to turn anything up so ... Cons...
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Simple fraction derivative. May 25th 2011, 01:05 PM #1 Junior Member Joined Mar 2011 Posts 32 Simple fraction derivative. Hi all, I have been asked to differentiate the function $f(x)=\frac{5}{x}$ where $(x>0)$. I have not been asked previously in exercises (or taught for that matter) how to differe...
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Quadratic help!! June 19th 2010, 10:11 PM #1 Newbie Joined May 2010 From Australia Posts 7 marnie can walk 1km/m faster the jon. She completes a 20km hike 1 hour before him. Write an equation and solve it to find there walking speeds. i cannot seem to solve this ahh Hello LaylaSam Suppos...
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Finding Internal Volumes and Total Surface Areas of a Cylinder March 30th 2010, 12:49 PM #1 Newbie Joined Mar 2010 Posts 13 Finding Internal Volumes and Total Surface Areas of a Cylinder A Pencil case in the shape of a cylinder with a hemisphere at each end has a diameter of 8cm and a total length of 22c...
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Can 2 times the dot product of 2 complex numbers equal to this? August 27th 2012, 07:04 AM #1 Can 2 times the dot product of 2 complex numbers equal to this? There's a section in Gibson's "Elementary Geometry of Differentiable Curves:An Undergraduate Introduction" book on page 6: "Example 1.4: Recall that th...
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If P then Q Date: 08/29/97 at 03:40:07 From: Harout Jarchafjian Subject: If p then q Our math book states that the implication of if p then q, the truth table, is p = true, q = true, statement = true p = true, q = false, statement = false p = false, q = doesn't matter, statement = true I don't understand ...
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Unbalancing lights in higher dimensions up vote 15 down vote favorite 8 In ''The Probabilistic Method'' by Alon and Spencer, the following unbalancing lights problem is discussed. Given an $n \times n$ matrix $A = (a_{ij})$, where $a_{ij} = \pm 1$, we want to maximise the quantity $x^T A y = \sum_{i=1}^n \sum_{j=1}^n...
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More expanding and simplifying and finding volume January 5th 2010, 07:32 AM Mukilab More expanding and simplifying and finding volume 1)Expand and simplify $n^2+(n-1)^2$ I got $n^4-2n+1$???? If n is a whole number show that this expression must be an odd number. From my previous post would this be the ...
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Advanced Topics on Clothing Simulation and Animation SIGGRAPH 2005 SIGGRAPH 2005 Course #6: Advanced Topics on Clothing Simulation and Animation Organizers: Hyeong-Seok Ko Kwang-Jin Choi Lecturers: Robert Bridson Donglian...
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How can you get a fair coin toss if someone hands you a coin that is weighted to come up heads more often than tails? Hint:Treat outcome TH as tails, HT as heads, and reflip when you get TT and HH. Explaination f a cheat has altered a coin to prefer one side over another (a biased coin), the coin can still be used fo...
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Logarithms: Solving for T Date: 01/30/98 at 21:01:04 From: Matt Hubble Subject: I need help solving a math problem My wife is currently taking a finance course and we are both stuck on a simple algebra problem that neither one of us has done for years since we have completed all of our schooling. The problem works o...
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limits and converges or diverges. Question 1: Find the limit: $\lim_{x \to 3} \frac{(x-3)}{3x^2-13x+12}$ Factorise the denominator: $\lim_{x \to 3} \frac{(x-3)}{3x^2-13x+12}=\lim_{x \to 3} \frac{(x-3)}{(x-3)(3x-4)}=\lim_{x \to 3} \ frac{1}{3x-4}=1/5$ Question 2: Determine if the following series converges or diverges: ...
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Simplify Equation January 30th 2010, 05:29 PM #1 Newbie Joined Jan 2010 Posts 2 Simplify Equation I am unable to come up with the answer to the key for this problem. Can someone give it a try? (4x^2+x-6)/(x^2+3x+2)-3x/(x+1)+5/(x+2) Thanks in advance! Dear sprivitor, $\frac{4x^2+x-6}{(...
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Change of variable for Laplace equation November 21st 2009, 05:22 PM jkhayer Change of variable for Laplace equation How do I show that the change of variable: x = rcosθ , y = rsinθ converts the Laplace equation uxx + uyy = 0 to urr + 1/r ur + 1/r2 uθθ = 0 Here is my understanding: uxx ...
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I need this explained.... December 8th 2010, 12:39 PM bradycat I need this explained.... Hello, My notes have y=sqrt x^2-16 Now it's -4 and 4 on the x axis, but just the top part of the y curve, as it starts with that. going out to each side. So the fixing up the equation above is y^2=x^2-16 so ...
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What does the computer suggest about the parity of p(n), for n in a fixed arithmetic progression? up vote 11 down vote favorite 3 Let p(n) be the number of partitions of n. A famous theorem of Euler allows one to compute the parity of p(n) quickly for quite large n. In: On the distribution of parity in the partition ...
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Mapping - Hyperbolic Functions April 13th 2014, 10:16 PM #1 Newbie Joined Apr 2014 From Australia Posts 2 Mapping - Hyperbolic Functions For the mapping f(z) = sinh(z), find and sketch the image of im(z) = d z = x + iy w = u + iv This is the solution given: $\left(\frac{v}{sin d}\ri...
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understanding this improper integral June 26th 2007, 04:31 PM Possible actuary understanding this improper integral My teacher worked this problem one way and I think I have found an easier way. Also, I don't understand how he came to his conclusion. Here is the problem: $\int_{0}^{e} ln {x}^2~dx$ This is h...
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limit find the limit as x approaches 0 of (1/x) to the x power Judging by the graph of the function the limit does not exist. But it's bean a while since I've calculated a limit and may be wrong(Doh) Actually I'm curious how does $\displaystyle \lim_{x \to 0} (\ frac {1}{x})^x = 1$ ? The function keeps getting more co...
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Trigonometry December 18th 2008, 03:58 PM #1 Newbie Joined Sep 2008 From Stockholm Posts 15 Trigonometry Hello! The problem is to find A=? B=? and C=? (7*cos x +3*sin x)^2 = A*cos 2x+B*sin 2x + C Can anyone help me with this problem? Thanks Dear Kluringen, you didn't say a...
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Finding Integer Pairs Whose Product Consists Only of 1's and 0's Date: 10/06/2004 at 20:21:23 From: Kris Subject: How can the product of 2 numbers contain only ones and zeros Given the base-10 representation of any integer a, does there exist a non-zero integer b such that the base-10 representation of the product ab...
5
[ -0.0830078125, 0.061279296875, -0.043701171875, -0.076171875, 0.018798828125, 0.06396484375, 0.0869140625, 0.00689697265625, -0.046142578125, -0.05078125, -0.061279296875, -0.010986328125, 0.11328125, 0.0830078125, 0.006011962890625, 0.072265625, -0.0201416015625, 0.0380859375, -...
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interesting problem with a function (not defined) - quite intimidating December 28th 2012, 03:20 PM zachd77 interesting problem with a function (not defined) - quite intimidating I found this question to be quite intimidating: Suppose a function f has the following properties: a) Show that: Attachmen...
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Simpleg Algorithm LP trouble. April 16th 2012, 08:24 PM #1 Member Joined Sep 2010 Posts 151 Thanks 3 Simpleg Algorithm LP trouble. Vinery 1 can produce 30 boxes per day. Vinery 2 can produce 20 boxes per day. Fred's needs at least 20 boxes a day. Kevin's needs at least 18 boxes a day. ...
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Solution for December 2008 - Math Central Current Recent problems problem with solutions Solution for December 2008 The Problem: MP82 December 2008 A point is placed inside an equilateral triangle so that its distances from t...
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Integration by Parts the Adult Way April 20th 2008, 06:23 PM #16 "You are almost right except u and v are functions of x...if they were different variables you would have to assume one is a constant...making the integration exceedingly simple" Okay, that may be where I'm going wrong. When I have taken u and v...
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Justin Bozonier: Innumeracy is the new illiteracy. Why Sample Sizes? When talking about an experiment design, the most contentious topic without a doubt is that of sample size. Most commonly, "Why is the sample size so big?" The good news is that the sample size doesn't have to be so big IF you're willing to compromis...
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Need help with exponents I dont remember how to do this problem and being summer, I dont have my textbook to help. Solve: 4^(x+2)=9^(x-1) I still cant figure it out, sorry. All of the other problems I have to do have the same base or can be simplified to have the same base. Whatever base you choose, the rules are the...
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Making all cardinals countable and its HOD up vote 8 down vote favorite 4 Suppose that $G$ is $Col(\omega, <Ord)$-generic over $V$ and let $W=HOD^{V[G]}$. Is $CH$ true in $W$? In general, what can we say about the behaviour of the power function in $W$? Update. Are the models $HOD^{V^{Col(\omega, <ord)}}$ and $gHOD$ ...
4
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How do you solve the problem: 0=3^2x-5X+2 I got the answer of X=1, X=2/3 but the answer in the book is -1/3,2 This is how I did it: 0=3^2x-5X+2 0=3^2x-3X-2X+2 0=3X(X -1) + 2 (X-1) 0= (X-1)(3X+2) 0= 1, -2/3
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Performance Analysis of ANN on Dataset Allocations for Pattern Mathematical Theory and Modeling www.iiste.org ISSN 2224-5804 (Paper) ISSN 2225-0522 (Online) Vol.2, No.10, 2012 Performance ...
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integral cosine and exponential I'm trying to solve the following integral int_0^{+infintity} 1/(1+a^2*x^2)*exp(-b^2*x^2)*cos(c*x) dx where a,b and c are real. thanks a lot Marco yes, it is exactly that. I will use \math next time I though it was not necessary to have $b\in N$ It is not sufficient that $b\in R$ why ...
5
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Non-Standard Prime up vote 9 down vote favorite 1 Hello, My question is about the non-standard models of the integers. If we add to the Peano's axioms $P$ of arithmetic the following axioms for a fixed constant $c$: $c \neq 0$, $c \neq 1$, $c \neq 1+1$, $c \neq 1+1+1$, etc... and $c=ab \implies a=1~~ou~~b=1$. We obta...
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2 Vector classes 2 Vector classes Two mutable vector types are available: Vector2 and Vector3, for 2D and 3D vectors, respectively. Vectors are assumed to hold floats, but most operations will also work if you use ints or longs instead. Construct a vector in the obvious way: >>> Vector2(1.5, 2.0) Vector2(1.50, 2.00)...
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Stuck on Volume of Solids April 2nd 2010, 12:32 AM #1 Newbie Joined Apr 2010 Posts 1 Hey guys, I have been attempting the following problem for days now, and I just cannot seem to get the right answers. I know it probably is really simple and that I am over thinking it, but my answers are always off. ...
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Triangle side length Given $\triangle$ABC, where AD is perpendicular to BC, B=45 $^{\circ}$, C=60 $^{\circ}$, and AB=10, determine the length of AC. Hello, chengbin! Given $\Delta ABC$, where $AD \perp BC,\;\;B=45^o,\;\;C=60^o,\;\;AB=10$ Determine the length of $AC$. Is there a typo? . . As written, altitude $AD$ is i...
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Calculus Question March 2nd 2010, 03:05 PM #1 Newbie Joined Feb 2010 Posts 19 Calculus Question I do not know how to find part b of this problem can anyone help me. When a cold drink is taken from a refrigerator, its temperature is 5°C. After 25 minutes in a 20°C room its temperature has increased t...
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Find the Perimeter of the Rectangle Date: 09/06/2002 at 17:08:11 From: Booram Subject: Circles and rectangles This question is too hard for me. Can you please tell me the solution? Two circles of radii 9 and 17 centimetres are enclosed within a rectangle with one side of length 50 cm. The two circles touch each othe...
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Laplace April 28th 2010, 02:40 PM dwsmith Laplace Is this going in the right direction with this problem? $y''-4y'+13y=e^{3t}; y(0)=0; y'(0)=1$ $s^2Y(s)-1-4sY(s)+13Y(s)=\frac{1}{s-3}$ $Y(s)[s^2-4s+13]=\frac{1}{s-3}+1$ $Y(s)=\frac{1}{(s-3)[(s-2)^2+11]}+\frac{1}{(s-2)^2+11}$ Before I conti...
5
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A question on the singular series and singular integral in Hardy-Littlewood Circle Method up vote 5 down vote favorite 2 Given a set $A$ of positive integers, set $r_{A,h}(N)$ to be the number of $h$-tuples $(a_1, \cdots, a_h)$ such that $N = a_1 + \cdots + a_h$. Set $f(z) = \sum_{a \in A} z^a$. Then by Cauchy's Theor...
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Math problem let a,b are positiv real such abc=1 prove that a+b+c>=sqrt(a)+sqrt(b)+ sqrt(c) because $a+1\geq 2\sqrt{a},b+1\geq 2\sqrt{b},c+1\geq 2\sqrt{c}$, we obtain $a+b+c \geq \sqrt{a}+\sqrt{b}+\sqrt{c}+(\sqrt{a}+\sqrt{b}+\sqr t{c}-3)<br />$$\geq \sqrt{a}+\sqrt{b}+\sqrt{c}+(3\sqrt[3]{\ sqrt{abc}}-3)<br /> =\sqrt{a}...
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critical values of motives up vote 3 down vote favorite 1 Hi friends, I have some questions concerning the critical values of motives, in the sense of Deligne. I will only look at motives of the form $h^i(X)$ where $X$ is a smooth projective algebraic variety over $\ mathbb{Q}$. If I understand correctly, the notion ...
4
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Factoring a Difference of Squares with Terms That Are Not Monomials Factoring a Difference of Squares with Terms That Are Not Monomials Date: 10/26/2008 at 21:55:53 From: Aaron Subject: Factoring difference of squares that are not monomials I need to know how to do this, and I can't do it..like here's an example if ...
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bernoulli equation February 5th 2009, 05:04 PM #1 Junior Member Joined Feb 2009 Posts 45 bernoulli equation xz(dz/dx) = x^2 + 3z^2 with z(1) = 1 ,,,,,,,,,, i have not learned bernoulli's equation and was given this question, although i have read about it on wikipedia, that was not enough can someone ...
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Laplace's equation in the semi-infinite strip 0 < x < a, y > 0 November 25th 2010, 12:53 AM mukmar Laplace's equation in the semi-infinite strip 0 < x < a, y > 0 Problem: $u_{xx} + u_{yy} = 0, 0 < x < a, y > 0$ $u(0, y) = u(a, y) = 0$ and $u(x, 0) = f(x)$ $u$ bounded as $y \to \infty$ Find $u...
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need help on probability My Solution:: b i) no answer b ii) no answer b iii) no answer You should have a table of the standard normal distribution. Let $z=(t-90)/20$, where $t$ is the time a punter spends in the casino in minutes, then $z$ has a standard normal distribution. a) That $t>100$ corresponds to $z>(100-90)/...
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Atoms of a sequence of Sigma-algebras up vote 3 down vote favorite I'm trying for some time now to prove or disprove the following conjecture to no avail: Let $S$ be a set and let $(\Sigma _n)$ be a sequence of countably generated $\sigma$-algebras on $S$ satisfying the following two conditions: 1. $\Sigma_...
5
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Hypothesis testing and confidence intervals March 3rd 2011, 09:26 AM jhallett17 Hypothesis testing and confidence intervals Here is the question: Suppose that we are interested in buying ball bearings from a certain manufacturer. We require very precisely manufactured ball bearings, and so we decide to inves...
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Dolbeault cohomology of complex tori. up vote 11 down vote favorite 5 Let $T=\mathbb C^n/\Lambda$ a complex torus. It is completely elementary to prove that the de Rham cohomology of $T$ in degree $q$ is isomorphic to the $q$-th exterior power of the dual of $\mathbb C ^n$. Indeed, if $\omega$ is a $d$-closed $q$-for...
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World Population Problem Using Integrals August 2nd 2010, 08:55 PM #1 Newbie Joined Jul 2010 Posts 3 World Population Problem Using Integrals Here is the factoids from the original problem: F(0) = 6 lim(x -> infinity) F(x) = 30 rate of population growth = $(A*e^t)/((.02*A+e^t)^2)$ where ...
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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: Egypttian and Greek sqare root Replies: 9 Last Pos...
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Murdered Professor Date: 06/26/97 at 14:22:58 From: Brett Wilson Subject: Exponential puzzle Dr. Math, Please help me with this puzzle given to me by my calculus professor: Suppose that you come into your professor's office to ask some questions shortly before 9:00 a.m. on Friday. You find him lying on the floor o...
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Algebra - Please help June 16th 2008, 11:23 AM #1 Member Joined Jan 2006 From Gdansk, Poland Posts 117 Algebra - Please help $X_1$, $X_2$ are nonempty sets. Let $\mathcal{F}_1 \subset 2^{X_1}$ and $\mathcal{F}_2 \subset 2^{X_2}$ be $\sigma$-algebras. Let $\mathcal{R} = \{A \times B: A \in \mathc...
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Java Matrix Package JAMA : A Java Matrix Package Background JAMA is a basic linear algebra package for Java. It provides user-level classes for constructing and manipulating real, dense matrices. It is meant to provide sufficient functionality for routine problems, packaged in a way that is natural and understandab...
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