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Existence and Multiplicity of Solutions to a Boundary Value Problem for Impulsive Differential Equations Journal of Applied Mathematics Volume 2013 (2013), Article ID 401740, 11 pages http://dx.doi.org/10.1155/2013/401740 Research Article Existence and Multiplicity of Solutions to a Boundary Value Problem for Impulsi...
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Trigonometry inequation and induction September 17th 2011, 04:43 AM Logic Trigonometry inequation and induction Hello, I need to prove that |sinnx|<=n|sinx| using mathematical induction, but I get stuck as to how to use the inductive presumption. Firstly, we need to check whether the given statement is t...
5
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S Ergodic Theory, Dynamical Systems and Applications Org: ...
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Use Mathematical Induction and Integration by Parts to prove integral October 8th 2013, 07:27 PM #1 Member Joined Oct 2013 From Washington state Posts 77 Thanks 1 Use Mathematical Induction and Integration by Parts to prove integral Prove that $\int\limits_0^1{x^n(1-x)^ydt} = \frac{n!}{(y+1)...
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find stationary points February 22nd 2010, 01:59 PM #1 find stationary points two problems i have differentiated. need to find stationary point and state if max or min value. $(a)y= (3x+1)^4$ $dy/dx= 12(3x+1)^3$ this is where im stuck. do i make dy/dx= 0? $(b)x=\frac{1}{4t^2+3}$ $dx/dt =...
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Improper Integrals My Tutor Cannot Understand!!! March 15th 2008, 03:03 PM #1 Newbie Joined Mar 2008 From san diego, CA Posts 3 Improper Integrals My Tutor Cannot Understand!!! Here are some problems I am having a hard time with. If anyone knows how to solve them It would be amazing. My tutor cannot ...
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Common Fixed Points of Generalized Cyclic Meir-Keeler-Type Contractions in Partially Ordered Metric Spaces Abstract and Applied Analysis Volume 2013 (2013), Article ID 787342, 7 pages http://dx.doi.org/10.1155/2013/787342 Research Article Common Fixed Points of Generalized Cyclic Meir-Keeler-Type Contractions in Part...
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The Effect of Control Strength on Lag Synchronization of Nonlinear Coupled Complex Networks Abstract and Applied Analysis Volume 2012 (2012), Article ID 810364, 11 pages http://dx.doi.org/10.1155/2012/810364 Research Article The Effect of Control Strength on Lag Synchronization of Nonlinear Coupled Complex Networks ...
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HELP! Fractions, variables, exponents, THE WORKS!! November 6th 2007, 08:14 PM #1 Newbie Joined Nov 2007 Posts 3 (2n/n^3-5n^2) + (2/n^2+ 5n) Please help, i have been trying to figure this out but i cant seem to finsih it! THANKS SO MUCH Hello, beachchick984! $\frac{2n}{n^3-5n^2} + \frac{2}{...
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problem with vector velocity August 31st 2008, 06:11 AM #1 problem with vector velocity i'm not a fan a vector velocities and relative velocity..so this is my predicament In this question, i is a unit vector due east and j is a unit vector due north. At 0900 hours a ship sails from the point P with posit...
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Poisson Equation for a Scalar Field We all know that for the gravitational field we can write the Poisson Equation: [itex]\nabla^2\phi=-4\pi G\rho[/itex] But I was wondering if, mathematically, we can write the same equation for a scalar field which scale as [itex]r^{-2}[/itex]. Here is the thing. When you deal with gr...
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Pricing interest rate swaps with lambda.r July 19, 2013 By Brian Lee Yung Rowe People think I’m joking when I say something should only take 20 lines of code. More often than not it is possible if you understand how to strip away unnecessary complexity. This example shows how to calculate the theoretical swap rate f...
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review question,stumped May 24th 2009, 04:47 PM #1 Junior Member Joined Apr 2009 Posts 44 review question,stumped A committee is to be formed to investigate what activities teenagers have in small communities. The committee is to have 7 members, chosen randomly. There are 10 parents,5 teenagers,and 4 adu...
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I dont know how to find these answers for these problems...probability February 7th 2008, 02:29 AM #1 Newbie Joined Feb 2008 Posts 12 I dont know how to find these answers for these problems...probability 2. A process follows the binomial distribution with n = 7 and p = .4. Find a. P(x = 3) b. P(...
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Integrating absolute values (definite integrals) - can't find good info January 31st 2009, 10:44 AM #1 Junior Member Joined Jan 2009 Posts 52 Integrating absolute values (definite integrals) - can't find good info Anyone have a good tutorial? Google just sends me to people asking questions like I am. I k...
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further maths quadratics and roots again September 29th 2008, 12:54 PM #1 Member Joined Sep 2008 Posts 239 further maths quadratics and roots again Getting used to these equations now just stuck on this one. The equation 2x² - 7x + 4 = 0 has roots a and b. find the quadratic equation with integer co...
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Complex numbers: Show z belongs to R Could you let me know if I proved this correctly ? Hope the text is readable enough I did not follow your argument. But you can try $z=x+iy, x,y \in \mathbb{R}$ Given $Im(z)=0 \implies y=0 \implies z=x, x \in \mathbb{R} \therefore z \in \mathbb{R}$ z is given to me as (2 - 3i)^ν +...
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simplify logarithm March 10th 2009, 04:11 PM #1 Member Joined Sep 2008 Posts 76 simplify logarithm I was wondering if there's a way to simplify this logarithmic expression i.e. (3/5) to the power log base 5 of n. -1's just a separate entity.S so you basically do the first part and subtract one...
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An Energy-Efficient and Fault-Tolerant Convergecast Protocol in Wireless Sensor Networks International Journal of Distributed Sensor Networks Volume 2012 (2012), Article ID 429719, 8 pages http://dx.doi.org/10.1155/2012/429719 Research Article An Energy-Efficient and Fault-Tolerant Convergecast Protocol in Wireless S...
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Scientific notation September 5th 2010, 10:07 AM #1 Junior Member Joined Feb 2010 Posts 47 Scientific notation Problem is: $(5.0028 x 10^-7) + (6.14 x 10^-10)$ If done on the calculator the result is $5.00894 x 10^-7 or 5.0090 x 10^-7$ I must be doing something incorrectly... -Add $5.0...
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Damped spring - general solution of IVP May 31st 2010, 11:00 PM #1 Newbie Joined Nov 2009 Posts 10 Damped spring - general solution of IVP Hi, I'm working on a 2nd order DE which describes the motion of a damped spring $mx'' + bx' + kx = 0$ I have found the general solution: $x(t) = A...
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Finite Difference Methods for Option Pricing under Lévy Processes: Wiener-Hopf Factorization Approach The Scientific World Journal Volume 2013 (2013), Article ID 963625, 12 pages http://dx.doi.org/10.1155/2013/963625 Research Article Finite Difference Methods for Option Pricing under Lévy Processes: Wiener-Hopf Facto...
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Finite-Time Stability Analysis of Switched Genetic Regulatory Networks Journal of Applied Mathematics Volume 2014 (2014), Article ID 730292, 11 pages http://dx.doi.org/10.1155/2014/730292 Research Article Finite-Time Stability Analysis of Switched Genetic Regulatory Networks ^1School of Control Science and Engineeri...
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prime numbers Hello all, How do I prove that there will be always be a prime number between n^2 and (n+1)^2? You know these theorems that state, "it is impossible to prove that....". This is like one of those. Theorem: The exists no "simple" proof to the above conjecture. Proof: Let us assume that there exists a "simp...
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Does EXP $\in$ P/poly imply NP=RP? Take the 2-minute tour × MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. I guess the answer is that this unknown. Maybe this implies some "lowness" result on NP relative to BPP? computational-complexity add co...
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Clamped Cubic Spline March 26th 2010, 01:56 AM Makall Clamped Cubic Spline A clamped cubic spline s for a function f is defined by $s(x)=\begin{cases} s_{0}(x) = 1 + Bx + 2x^2 - 2x^3 & \text{if } 0 \le x < 1 \\ s_{1}(x) = 1 + b(x - 1) - 4(x - 1)^2 + 7(x - 1)^3 & \text{if } 1 \le x \le 2 \end{cases}$ Fi...
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Prove a^3+abc+c^3=0 if 1/(m^3) and 1/(n^3) are the roots of ax^2+bx+c=0, and m(n^2)=1 May 25th 2011, 07:51 AM #1 Newbie Joined May 2011 Posts 1 Prove a^3+abc+c^3=0 if 1/(m^3) and 1/(n^3) are the roots of ax^2+bx+c=0, and m(n^2)=1 Part 1 of question: Given ax^2+bx+c=0, and the roots are m and n, write the...
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Generalized Almost Convergence and Core Theorems of Double Sequences Abstract and Applied Analysis Volume 2014 (2014), Article ID 152910, 7 pages http://dx.doi.org/10.1155/2014/152910 Research Article Generalized Almost Convergence and Core Theorems of Double Sequences Department of Mathematics, Faculty of Science, ...
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Planar Waves of the Buffered Bistable System Abstract and Applied Analysis Volume 2013 (2013), Article ID 936296, 13 pages http://dx.doi.org/10.1155/2013/936296 Research Article Planar Waves of the Buffered Bistable System ^1College of Mathematics and Information Science, Henan University, Kaifeng 475001, China ^2In...
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Patent US5218646 - Classification procedure implemented in a hierarchical neural network, and hierarchical neural network The invention relates to a classification procedure implemented in a tree-like neural network, comprising learning steps in the course of which the neural network determines synaptic coefficients in...
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Matrix problem Can someone please help me solve the equation by using the inverse of the coefficient matrix? Thanks! 4x+y-4z=17 2x+y-z=12 -2x-4y+5z=17 Inverse of the coefficient matrix??? How about just the coefficient matrix. $\displaystyle \begin{bmatrix}<br /> 4 & 1 & -4 & 17\\ <br /> 2 & 1 & -1 & 12\\ <br /> -2 & ...
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help needed with this Riemann hypothesis argument May 18th 2013, 11:31 AM #1 Newbie Joined Mar 2010 Posts 9 help needed with this Riemann hypothesis argument Hi, I would be grateful for any comments pointing out gross mistakes in this "proof" as it seems too simple (and short!) to be correct. Did I miss ...
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Help with annuities due. December 6th 2011, 11:39 AM Johnnytest20 Help with annuities due. Also ya know show me the formulas for annuities due? The instructions in the book are: Find the amount of the following annuities due if interest is compounded annually. Find the amount of interest earned. R= $12...
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Future Value Use this formula to find the indicated value: FV=PMT((1+i)^n)-1)/i FV=4000 PMT=200 i=.02 n=? Find n. First, FVi= PMT((1+i)^n- 1)= PMT(1+i)^n- PMT FVi+ PMT= PMT(1+i)^n (1+i)^n= FVi/PMt+ PMT/PMT= (FVi/PMT)+ 1 Now, since n is an exponent, you will need to us a logarithm: n log(1+i)= log((FVi/PMT)+ 1) n = (LO...
5
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The Effect of Different Strategies and the Structure on Opinion Formation Discrete Dynamics in Nature and Society Volume 2013 (2013), Article ID 705318, 6 pages http://dx.doi.org/10.1155/2013/705318 Research Article The Effect of Different Strategies and the Structure on Opinion Formation ^1Department of Mathematics...
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About the Local Stability of the Four Cauchy Equations Restricted on a Bounded Domain and of Their Pexiderized Forms Abstract and Applied Analysis Volume 2013 (2013), Article ID 380743, 9 pages http://dx.doi.org/10.1155/2013/380743 Research Article About the Local Stability of the Four Cauchy Equations Restricted on ...
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Two complex number problems! November 30th 2010, 05:48 AM #1 Junior Member Joined Oct 2010 Posts 29 Two complex number problems! Hello! (First problem) Express $sin5x$ in terms of $a) sinx$ and $b) cosx$ Attempt: According to de Moivre's formula - $(cosx+isinx)^n=cos(nx)+isin(nx)$ so: de M...
4
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Cauchy Riemann equations September 5th 2009, 01:18 PM riemannsph12 Cauchy Riemann equations Show that (a) directly (b) using the Cauchy Riemann equations that if $f(z) \in \mathbb{R}$$\forall z \in \mathbb{C}$, then for any $z \in \mathbb{C}$ if $f'(z)$ exists then $f'(z)=0$. I don't know how to...
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find the missing factor how do i do this problem find the missing factor 7m2 times (?) = 35m8 -28m5 -42m2 jim1174 I understand the problem as, $7m^2 (?)=35m^8-28m^5-42m^2$ On the right side you get $35m^8$ thus, which number when multiplied by $7m^2$ gives $35m^8$? The answer is $5m^6$. Now on the right side you also ...
4
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Equation Help (x-y)y'=(x+y) I've tried v=y/x and v=x-y, and both times it has just ended up as a mess. the solution Mathematica is pumping out seems to indicate that v=y/x was the right way to go. you can certainly separate the equation that way $$(x-y)y'=(x+y)$$ $$v=\frac{y}{x}$$ $$y=v x$$ $$y'=x v'+v$$ $$(x-v x)(x v...
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the encyclopedic entry of Tent function The triangular function (also known as the triangle function, hat function, or tent function) is defined either as: begin{align} operatorname{tri}(t) = and (t) quad &overset{underset{mathrm{def}}{}}{=} max(1 - |t|, 0) &= begin{cases} 1 - |t|, & |t| < 1 0, & mbox{otherwise} end{c...
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Math Help February 12th 2006, 02:58 AM #1 Cubic Another that has stumpted me... (sorri about the typos ticbol) I have P(x) = x^3 - 3x + 2 So i find that P(2) is a value as it = zero. So I have: P(x) = (x-2)(ax^2 + bx + 1) (typo) Then I divide x-2 / x^3 - 3x + 2 But I get x^2 +2x...
4
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Tripled Coincidence and Common Fixed Point Results for Two Pairs of Hybrid Mappings Abstract and Applied Analysis Volume 2014 (2014), Article ID 803729, 11 pages http://dx.doi.org/10.1155/2014/803729 Research Article Tripled Coincidence and Common Fixed Point Results for Two Pairs of Hybrid Mappings ^1Department of ...
5
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basic bilinear forms May 3rd 2010, 02:30 PM Dandelion basic bilinear forms Let f:V × V → F be a bilinear form on a vector space V, where F is the field of scalars. 3 conditions must be fulfilled: 1. f(u1+u2,v)=f(u1,v)+f(u2,v) 2. f(u,v1+v2)=f(u,v1)+f(u,v2) 3.f(u,tv)= f(tu,v)=tf(u,v) If F=Q (as th...
5
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the encyclopedic entry of pascal limaçon In geometry , limaçons (pronounced with a soft c ), also known as limaçons of Pascal , are heart-shaped mathematical curves. A limaçon is defined as a roulette formed when a circle rolls around the outside of a circle of equal radius (see the diagram on the right). Thu...
4
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Boundary Value Problems for a Super-Sublinear Asymmetric Oscillator: The Exact Number of Solutions International Journal of Mathematics and Mathematical Sciences Volume 2013 (2013), Article ID 705984, 9 pages http://dx.doi.org/10.1155/2013/705984 Research Article Boundary Value Problems for a Super-Sublinear Asymmetr...
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[ -0.1064453125, 0.033935546875, -0.0020904541015625, 0.04833984375, -0.053955078125, 0.0322265625, -0.0179443359375, -0.01287841796875, 0.01116943359375, -0.12109375, 0.021240234375, -0.040771484375, 0.003692626953125, 0.0166015625, 0.035888671875, -0.01953125, -0.060791015625, -0.1...
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The Noise Performance of a Multiple-Input-Port and Multiple-Output-Port Low-Noise Amplifier Connected to an Array of Coupled Antennas International Journal of Antennas and Propagation Volume 2011 (2011), Article ID 438478, 12 pages http://dx.doi.org/10.1155/2011/438478 Research Article The Noise Performance of a Mult...
4
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Confused about how to solve simple problem...? September 14th 2009, 07:55 PM EyesThatSparkle02 Confused about how to solve simple problem...? The distance between two cities is 10km more than one third of the distance between them? I understand the answer is 15 km - but how do i put the answer in an algebra...
4
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Invertible elements in monoid rings of unital monoids without non-trivial invertible elements up vote 4 down vote favorite This question is somewhat related to Tilmans notorious problem in this post. Let $(M,\cdot)$ be a monoid with unit $1$ and set $$(M,\cdot)^{\times} := \lbrace x \in M \mid \exists y \in M : xy=yx=...
5
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Midpoint Theorem September 26th 2012, 11:19 PM #1 Newbie Joined Sep 2012 From San Jose, CA Posts 11 Midpoint Theorem A triangle has vertices A (a,b) , B (c,d) and C (e,f). Prove two things - algebra only - that the line segment connecting the midpoint of two sides of the triangle is parallel to the t...
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Sum of square free divisors of integer March 23rd 2012, 05:30 AM pranay Sum of square free divisors of integer Hi, is there any forumula to find the sum of square free (Square-free integer - Wikipedia, the free encyclopedia) divisors of an integer? One way is to get the divisors then check for each if it is ...
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Multiobjective Optimization Design of a Fractional Order PID Controller for a Gun Control System The Scientific World Journal Volume 2013 (2013), Article ID 907256, 8 pages http://dx.doi.org/10.1155/2013/907256 Research Article Multiobjective Optimization Design of a Fractional Order PID Controller for a Gun Control ...
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New Poisson's Type Integral Formula for Thermoelastic Half-Space Mathematical Problems in Engineering Volume 2009 (2009), Article ID 284380, 18 pages http://dx.doi.org/10.1155/2009/284380 Research Article New Poisson's Type Integral Formula for Thermoelastic Half-Space ^1Department of Mathematics and Engineering, Ag...
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Euler problems/181 to 190 From HaskellWiki < Euler problems (Difference between revisions) (solution to Dmwit (Talk | contribs) problem 185) (another solution to problem 185) ← Older edit Newer edit → Line 175: Line 175: unless done unless done main main + </haskell> ...
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Tutorial 12 Tutorial 12 - Perspective Projection Background We have finally reached the item that represents 3D graphics best - the projection from the 3D world on a 2D plane while maintaining the appearance of depth. A good example is a picture of a road or railway-tracks that seem to converge down to a single point...
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Explicit formula for the number of compositions with m strictly positive parts bounded by n? up vote 2 down vote favorite Is there any known formula for the number of compositions of an integer k (partitions with considering the order of the parts) of length m (exactly m parts) where the parts do not exceed a given in...
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A Frequency Selection Method Based on the Pole Characteristics International Journal of Antennas and Propagation Volume 2013 (2013), Article ID 862029, 8 pages http://dx.doi.org/10.1155/2013/862029 Research Article A Frequency Selection Method Based on the Pole Characteristics ^1Harbin Institute of Technology, Harbi...
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tion Results 1 - 10 of 26 - SIAM Review , 2002 "... Abstract. Interior methods are an omnipresent, conspicuous feature of the constrained optimization landscape today, but it was not always so. Primarily in the form of barrier methods, interior-point techniques were popular during the 1960s for solving nonlinearly c...
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Newsgroups: sci.math From: orourke@sophia.smith.edu (Joseph O'Rourke) Subject: Re: inscribed square problem Keywords: geometry Organization: Smith College, Northampton, MA, US Date: Thu, 11 Jun 1992 13:44:03 GMT In article <34430@sdcc12.ucsd.edu> kwalker@canyon.ucsd.edu (Kevin Wa...
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Turbulent Convection Advances in Mechanical Engineering Volume 2010 (2010), Article ID 976254, 10 pages http://dx.doi.org/10.1155/2010/976254 Research Article Numerical Simulation of Water/ Nanofluid Turbulent Convection Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università degli Studi di Napoli, ...
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Complex numbers question August 3rd 2010, 04:09 AM blackdragon190 Complex numbers question I'm completely stuck on this one question: Find real x and y for which x - y +2(x + y - 1)i = 5 + 4i Can someone go through it with me or give me a hint..? August 3rd 2010, 04:27 AM Plato August 3rd 2010, 05:11...
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Abelian Groups April 10th 2012, 04:53 PM Aryth Abelian Groups Let G be an Abelian group. Let H and K be subgroups of G with orders 36 and 45, respectively. Which of the following is a possible order of HK? a) 5 b) 9 c) 20 d) 90 e) 180 This doesn't seem difficult, but I've never taken Ab...
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Homework HELP June 28th 2006, 07:40 PM #1 Newbie Joined Jun 2006 Posts 15 Homework HELP 1. a polynomial has a degree of 5 whose coeffiecients are real numbers has the zeros 2, 4i, and 4 + i. Idenitfy the remaining zeros. A: -4i, 4-i B: -2, -4i, 4-i C: 4i, -4-i D: -4i, 4+i 2. an en...
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Circular Motion and Gravitation Mechanics: Circular Motion and Gravitation Circular Motion and Gravitation: Problem Set Overview This set of 27 problems targets your ability to combine Newton's laws and circular motion and gravitation equations in order to analyze the motion of objects moving in circles, including or...
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A Note on Gronwall’s Inequality on Time Scales Abstract and Applied Analysis Volume 2014 (2014), Article ID 623726, 4 pages http://dx.doi.org/10.1155/2014/623726 Research Article A Note on Gronwall’s Inequality on Time Scales College of Mathematics and Computer Science, Fuzhou University, Fuzhou 350002, China Recei...
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The analysis of financial performance of BOC Bangladesh Limited (Bangladesh Oxygen Limited) • The analysis of financial performance of BOC Bangladesh Limited (Bangladesh Oxygen Limited) The analysis of financial performance of BOC Bangladesh Limited (Bangladesh Oxygen Limited) • By Super Admin • Published 3 Sep...
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Course Content and Outcome Course Content and Outcome Guide for MTH 241 Course Number: MTH 241 Course Title: Calc for Mgmt, Life/Social Sci Credit Hours: 4 Lecture Hours: 40 Lecture/Lab Hours: 0 Lab Hours: 0 Special Fee: Course Description Includes limits, continuity, derivatives, and integra...
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Successive Iteration of Positive Solutions for Fourth-Order Two-Point Boundary Value Problems Abstract and Applied Analysis Volume 2013 (2013), Article ID 621315, 8 pages http://dx.doi.org/10.1155/2013/621315 Research Article Successive Iteration of Positive Solutions for Fourth-Order Two-Point Boundary Value Problem...
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the encyclopedic entry of matrix transposition In-place matrix transposition , also called in-situ matrix transposition , is the problem of transposing an $N times M$matrix in-place in computer memory : ideally with $O\left(1\right)$ (bounded) additional storage, or at most with additional storage much less ...
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Basic Concepts of Matrices Definition 1: An r × c matrix (also called an array) is a rectangular array (or table) with r rows and c columns. We can represent such a matrix as A = [a[ij]] where 1 ≤ i ≤ r and 1 ≤ j ≤ c. Thus a [ij] is the element in the ith row and jth column. In Excel a matrix is represented as a rect...
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[SOLVED] ∫ xcos^2(2x)dx &amp; ∫ln(x^2+14x+49)dx October 8th 2009, 08:50 AM #1 Newbie Joined Sep 2009 Posts 5 [SOLVED] ∫ xcos^2(2x)dx &amp; ∫ln(x^2+14x+49)dx Hi, I would like some help evaluating the following integrals. I'm not sure if I am doing all the right steps. ∫ $xcos^{2}(2x)dx$ ...
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Critical numbers problem October 30th 2012, 04:14 PM nubshat Critical numbers problem Find all the critical numbers of the function f(x) = x+ln(|cos(x)|) that lie in the interval [pi, 3pi]. Please help, thanks in advance. October 30th 2012, 04:32 PM Soroban Re: Critical numbers problem Hello, nubsha...
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An Opial-Type Inequality on Time Scales Abstract and Applied Analysis Volume 2013 (2013), Article ID 534083, 5 pages http://dx.doi.org/10.1155/2013/534083 Research Article An Opial-Type Inequality on Time Scales ^1College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024, China ^2D...
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Definite Integration February 9th 2010, 09:36 PM #1 Newbie Joined Nov 2009 Posts 19 Definite Integration hi guys, i dont know where to place this integration question under, so i guess i'lljust place it here. I cant get the answer after many tries.. Find the area bounded by the given curves: y=...
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The Purplemath Forums Hello, I am new to Purplemath, and am experiencing some difficulty with the above subject. Here is the problem: (Square root y + Square root y+7=7), I raised the entire equation to the power of 2, to elimnate the square root. This is what I have so far: y+y+7=49 Subtracted 7 from both sides Gav...
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the distance September 18th 2010, 04:47 PM #1 Junior Member Joined Aug 2010 Posts 25 the distance A boat with an ill passenger is 7 1/2 mi north of a straight coastline which runs east and west. A hospital on the coast is 60 miles from the point on shore south of the boat. If the boat starts toward s...
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solve given a yh1 May 15th 2009, 11:52 PM #1 solve given a yh1 Hello, I cannot for the life of me remember how to do this. Can someone help please? Solve the following differential equation xy''+y'=12x^2 given that yh1 = 1 is a solution of the homogeneous equation. Thanks. The procedure to arri...
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Field Independent Cosmic Evolution Journal of Astrophysics Volume 2013 (2013), Article ID 590171, 12 pages http://dx.doi.org/10.1155/2013/590171 Research Article Field Independent Cosmic Evolution ^1Department of Physics, University of Kalyani, Nadia 741235, India ^2Department of Physics, Jangipur College, Murshidab...
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Trigonometry - finding a length November 6th 2007, 06:31 PM lw818 Trigonometry - finding a length There are 6 points (U,V,W,X,Y,Z) in a 2D space. * Point Y lies on line WX * Point Z lies on line UX * VW and YZ are perpendicular to WX * UY and VY are equal length VW = 400, XY = 200, YZ = 100...
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Sum of Cube Solution Restated: Find X, Y, minimum Z (all positive integers) where (X/Z)^3 + (Y/Z)^3 = 6 Again, a generalized solution would be nice. You are asking for the smallest z s.t. x^3 + y^3 = 6*z^3 and x,y,z in Z+. In general, questions like these are extremely difficult; if you're interested take a look at b...
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On a Hypersurface of a Finsler Space with Randers Change of Matsumoto Metric Geometry Volume 2013 (2013), Article ID 842573, 6 pages http://dx.doi.org/10.1155/2013/842573 Research Article On a Hypersurface of a Finsler Space with Randers Change of Matsumoto Metric ^1Department of Pure & Applied Mathematics, Guru Gha...
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integrals, sin function and a denominator September 20th 2009, 01:11 PM #1 Member Joined Feb 2009 Posts 91 integrals, sin function and a denominator HI Okay the goal is to evaluate this integral integral sign (I will use S) (sin t^(1/2))/(t^1/2) so if I let u = t^1/2 and du = dt/2(t^1/2) ...
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Two New Efficient Iterative Regularization Methods for Image Restoration Problems Abstract and Applied Analysis Volume 2013 (2013), Article ID 129652, 9 pages http://dx.doi.org/10.1155/2013/129652 Research Article Two New Efficient Iterative Regularization Methods for Image Restoration Problems School of Mathematica...
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Induction on sequences November 1st 2009, 07:24 PM #1 Induction on sequences The sequence of positive numbers $u_1, u_2, u_3,...$ is such that $u_1<4$ and $u_{n+1}=\frac{5u_n+4}{u_n+2}$ By considering $4-u_{n+1}$, prove by induction that $u_n<4$ for all $n\geq{1}$ My attempt N.B To make this eas...
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Find the area of a cone inside a cylinder April 21st 2012, 10:33 AM #1 Newbie Joined Oct 2009 Posts 5 Hi! I'm trying to find the area of the cone x^2+y^2=z^2 inside x^2+(y-a)^2=a^2 -- but I believe I'm stuck... :/ I parametrize the cone as r=u*i+v*j+sqrt(u^2+v^2)k, find dr/du=i+u/sqrt(u^2+v^2)*k and d...
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Frequency Response of an Impacting Lap Joint Journal of Nonlinear Dynamics Volume 2014 (2014), Article ID 310834, 10 pages http://dx.doi.org/10.1155/2014/310834 Research Article Frequency Response of an Impacting Lap Joint Civil Engineering, The University of Mississippi, Carrier Hall 106, P.O. Box 1848, MS 38677, U...
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Math Help October 27th 2010, 11:22 AM #1 gamma dist Hey guys-been struggling with this question the whole day- Weekly downtime X (in hrs) for a certain industrial machine has approximately a gamma dist. with alpha=3.5 and beta=1.5. Loss L (in dollars) as a result of this downtime is given by $L=30X+2x^2$. ...
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Calculating simple Interest and Monthly Payments December 4th 2011, 06:38 PM DavidPR Calculating simple Interest and Monthly Payments Hello All. I make websites and I want to provide financing for those who can't afford the full amount up front. The only payment plan I will have is 12 months. The interest r...
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Trig Identity - I'm so close (i think..) October 14th 2009, 09:58 AM #1 Newbie Joined Oct 2009 Posts 12 Trig Identity - I'm so close (i think..) Im still trying to figure out these identities. Ive never had so much trouble with math, ugh. I think I almost figured this one out but I must have taken a wron...
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the encyclopedic entry of hpcode-plus ± The plus-minus sign (±) is a mathematical symbol commonly used to indicate the precision of an approximation , or as a convenient shorthand for a quantity which has two possible values opposite in sign. In mathematics, the sign is pronounced "plus or minus" and indicates ...
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Math please check Posted by Mary on Wednesday, October 1, 2008 at 6:16pm. L1=P1(1,3,5) and P2(4,5,2) L2=P4(-1,6,-3) and P3(points not given) a. Find the equations of lines L1 and L2. P3 is the midpoint of L1, that is, u=0.5 at P3. P(u)=P1 + u((P2-P1) 0 which is less than or equal to (u)which is less than or equal t...
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Nuclear Waste Disposal into Sun or outside Solar System? skeptic2 I am curious as to how Venus or Mercury would reduce the velocity of an infalling object from Earth. First off, the goal is to increase, not decrease, the velocity if the goal is to hit the Sun. A planet can be used to change both the magnitude and ...
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Tutorial Pymix Tutorial The aim of this tutorial is to provide examples and explanations for the models and methods implemented in the PyMix library. A certain familiarity with Python and mixture model theory is assumed as the tutorial focuses on the implementation in PyMix. Details for all the underlying theoretical...
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Adding/Subracting Fractions with Variables August 15th 2008, 08:51 AM cmf0106 Adding/Subracting Fractions with Variables I need some help understanding whats going on here. Description: When adding fractions with variables in one or more denominators, the LCD will have each variable to its highest power...
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Von Neumann inequality January 11th 2010, 01:38 PM #1 Von Neumann inequality Hello friends. A friend of mine is doing research with a professor on the 3 by 3 multivariable case of the Von Neumann inequality. I am helping him out a little bit, but we are running into some techincal problems. For example, ...
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Differential Equations Important Note: If you see funny characters in your display, and if you are using Xwindows (for instance, under linux), please see the following file for information on configuring your browser: Xfonts (unfortunately, printing will still give funny fonts - you will need to use a different form...
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A Finite Difference Scheme for Pricing American Put Options under Kou's Jump-Diffusion Model Journal of Function Spaces and Applications Volume 2013 (2013), Article ID 651573, 11 pages http://dx.doi.org/10.1155/2013/651573 Research Article A Finite Difference Scheme for Pricing American Put Options under Kou's Jump-D...
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Profit Loss & Discount Problems May 16th 2010, 11:36 PM rn5a Profit Loss & Discount Problems I am a 13 year old kid. I have got 2 problems relating to profit, loss & discount which I am not able to solve. Can someone please help me out with the 2 problems? Here are they: 1. How much per cent above the cost ...
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Integration $\int_{-\infty}^{\infty} x\cdot e^{-x^2}dx$ ? If that is so, then the integral is 0, becoase integral of odd function from -infinity to +infinity is 0. Here is one way. INT.(-inf.-->+inf.)[x e^(-x^2)]dx Let u = e^(-x^2) So du = e^(-x^2)*(-2x dx) INT.(-inf.-->+inf.)[x e^(-x^2)]dx = INT.(-inf.-->+inf.)[e^(-x...
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Wolfram Demonstrations Project Trajectories of a Solitary Wave for the KdV Equation with Variable Coefficients One aspect of David Bohm's causal interpretation of quantum theory is that the formalism is applicable to all linear or nonlinear partial differential equations (PDEs or nPDEs) obeying the continuity equation...
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