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sigma notation November 3rd 2007, 08:52 AM Tom123 sigma notation Hi. I have this example in my boo I have a similar question which I started, But I don't really understand how the sigma notation worked in the first link... therefore I don't know the next line on mine. Looking for any pointers/...
4
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The Fibonacci sequence From HaskellWiki (Difference between revisions) (→‎With scanl) m (added unfoldr version, removed so-called "fix point" solution) ← Older edit Newer edit → Line 15: ...
4
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Notions of simultaneity in strongly curved spacetime harrylin And a quick comment on that quick comment: I don't see the qualitative difference with "The light speed limit doesn't exist; the tachyon space works just fine, it is the same solution. You just have to deal with technical problems to get through c". It d...
4
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Patent US5835060 - Self-resolving LBI triangulation Publication number US5835060 A Publication type Grant Application number US 08/731,191 Publication date Nov 10, 1998 Filing date Oct 7, 1996 Priority date Oct 7, 1996 Fee status Lapsed Publication number 08731191, 731191, US 5835060 A, US 58350...
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nline DEtools/rifsimp/nonlinear - information and options specific to nonlinear equations Description • Leading nonlinear equations This help page explains how rifsimp handles equations which are polynomially nonlinear in their leading indeterminate (called leading nonlinear equations), or equations that are l...
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Right angle: you know all 3 angles and length a, not b or c? June 18th 2008, 08:33 AM john r Right angle: you know all 3 angles and length a, not b or c? Could someone help me with this? I have a right angle triangle, 90, 30 and 60 degrees. Say the length of A is 30 inches. What would B and C be? Any help would ...
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F-measurable January 11th 2011, 07:07 PM Volga F-measurable I am a newby in stochastic processes, which I study in the context of the modelling of security prices (financial mathematics). I'd appreciate your help. Question. Consider the sample space $\Omega=\{-3,-2,-1,1,2,3\}$ and the algebra F= $\{\phi,\{-...
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Go4Expert - View Single Post - Math Riddle | 17 Jul 2009 This code found multiple results; it only searches for approximations (hence if test1>=-0.05 && test2<=0.05) but all the results revolve around 6 hence the guess that there was an integral solution that was precisely 6.0. But this would make x,y,z non-integral a...
5
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Transposing a fraction with the same unknown November 17th 2009, 04:29 PM #1 Newbie Joined May 2009 Posts 5 Transposing a fraction with the same unknown I am struggling to transpose my OWN formula, my math skills are terrible. I have: $1.5=(x+10)/(x+5)$ I know x is 5 because I made this problem....
4
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Math Help August 30th 2009, 09:36 AM #1 Newbie Joined Jun 2009 Posts 19 These are typical examples of the limits I am having trouble on. I need help and I have test on Monday eek I understand most limits I just have trouble with these. =D Thank You-- Carol-ANN PS. I know how to do number 4 F...
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Second derivatives using implicit differentiation October 17th 2010, 02:47 PM #1 Member Joined May 2010 Posts 241 Second derivatives using implicit differentiation Hi there. Well, I wanted to know how to find the second derivatives of a function using implicit differentiation. Is it possible? I think it ...
5
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Solvability of Three-Point Boundary Value Problems at Resonance with a Abstract and Applied Analysis Volume 2012 (2012), Article ID 658010, 16 pages http://dx.doi.org/10.1155/2012/658010 Research Article Solvability of Three-Point Boundary Value Problems at Resonance with a -Laplacian on Finite and Infinite Interva...
5
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Solvable Group April 12th 2010, 11:27 AM mathman88 Solvable Group Show $B=\left\{ \left. \left(\begin{array}{cc}x&z\\0&y\end{array}\right) \;\; \right| \;\; x,y\in \mathbb{F}_p^\times,\; z\in\mathbb{F}_p \right\}$ is a solvable group. The group operation is matrix multiplication. April 12th 2010, 11:38 AM ...
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Mathematical Induction March 29th 2009, 02:31 PM wir3d_riot Mathematical Induction Hi there, I'm totally dumbfounded by this question. Could anyone give me a basis on where to start so I can at least try to work it out myself? Quote: Use mathematical induction to show that: $S(n) = 3*2^{n-1}...
4
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Finish this equation $3(x-3)^3=375$ $(x-3)^3=125$ $x^3-9x^2&plus;27x-9=125$ $x^3-9x^2&plus;27x-134=0$ Not sure where to go from here Sorry? What y? I need to find the value of x. The answer is supposedly 8. $(x-3)^3=125$ Since $125=5^3$ then $(x-3)^3=5^3$. From this we have that x-3=5 or x=8 No need to expand. From ...
4
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Echelon Form Row Echelon Form 3. Computing row echelon form The leading entries in a row echelon form are called the pivots. The rows and the columns containing the pivots are the pivot rows and the pivot columns. For example, in the row echelon form 1 3 4 5 [ 0 0 2 6 ] 0 0 0 0 the pivots are the entries 1, 2,...
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Trampoline Problem! Please Help Me Out! 1. The problem statement, all variables and given/known data For my math class, I had to come up with a real-life scenario where data that is extracted from the scenario can produce a sinusoidal function, and I have to graph the function. My scenario involves a person bouncing u...
4
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surjection of composition May 3rd 2009, 11:45 AM #1 surjection of composition Below f is a function from a set A to a set B, and g is a function from the set B to a set C. Property 1: If f and g are surjections, then fg is a surjection. Proof of Property 1: Let z an arbitrary element in C. Then ...
4
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Upper Semicontinuous Property of Uniform Attractors for the 2D Nonautonomous Navier-Stokes Equations with Damping Abstract and Applied Analysis Volume 2013 (2013), Article ID 861292, 11 pages http://dx.doi.org/10.1155/2013/861292 Research Article Upper Semicontinuous Property of Uniform Attractors for the 2D Nonauton...
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Coursework help October 24th 2010, 08:56 AM #1 Newbie Joined Oct 2010 Posts 2 Coursework help Hi, i've just started a degree in Computer Science and have a discrete math assignment to hand in tommorow. Could anyone please help? (I'm not asking you to do it for me but explain how to do it or show me ...
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Length of a Curve Consider x=(e^t)+(e^-t), y=5-2t, 0<t<3. Find the length of the curve. Recall the arc length integral: $= \int_{ {t }_{i } }^{ {t }_{f } } \left | r'(t) \right | dt$ Where, $r'(t) = \sqrt[ ]{x'(t)^{2}+y'(t)^{2} }$ So we have: $x(t) = e^{t}+e^{-t} = 2cosh(t)$ $y(t) = 5 - 2t$. Then, $x'(t) = 2sinh(t)$ $...
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I'm trying to understand why this is the domain of this function September 17th 2010, 07:38 PM #1 Newbie Joined Sep 2009 Posts 14 I'm trying to understand why this is the domain of this function I'm trying to find the domain for the function: square root of (9-x^2)...So what I do is solve for 9-x^2 >= 0 ...
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Human Ovarian Reserve from Conception to the Menopause Abstract The human ovary contains a fixed number of non-growing follicles (NGFs) established before birth that decline with increasing age culminating in the menopause at 50–51 years. The objective of this study is to model the age-related population of NGFs in th...
4
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Radius of Convergence, limits: Complex numbers. July 25th 2012, 07:33 AM ebb Radius of Convergence, limits: Complex numbers. I'm really shaky with radius of convergence and limits when complex numbers are thrown into the mix, so I would be really grateful if someone could check I've answered these questions corr...
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subgroups and generators August 30th 2009, 04:45 AM #1 Super Member Joined Aug 2009 Posts 639 subgroups and generators Hi, Im really confused with subgroups and generators. May I know what is the difference? I was reading a book where they state that the subgroups of Z18 are <0>,<1>,<2>,<3>,<6>,...
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[SOLVED] Reviewing Logs and stuck on a problem...help?!? October 6th 2009, 09:40 PM strngFan [SOLVED] Reviewing Logs and stuck on a problem...help?!? I have the following problem on my homework: 50(1.02)^3x = 30(1.47)^x solve for x I've tried many things and quick math gave the answer as x=1.56... but ...
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Prove that 4 vector potential is really a 4 vector? [QUOTE=Phrak;1725452] I don't understand where [tex]a_{\mu} \rightarrow \Lambda_{\mu}{}^{\nu} a_{\nu} + \partial_{\mu}\Omega[/tex] comes from. If I assume [tex]\acute{a}_{\mu}[/tex] is a regauged (dual) 4-vector, [tex]\acute{a}=a + d\Omega[/tex], the Lorentz transf...
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Two surds problems - one involving simultaneous equations.. August 7th 2008, 08:36 AM #1 Member Joined Nov 2007 Posts 100 Two surds problems - one involving simultaneous equations.. 1. Two sides of a triangle are 5sqrt(3) and 10sqrt(2) respectively, while the hypotenuse is unknown. Here I tried finding t...
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Flow of an Eyring-Powell Model Fluid between Coaxial Cylinders with Variable Viscosity Chinese Journal of Engineering Volume 2013 (2013), Article ID 808342, 7 pages http://dx.doi.org/10.1155/2013/808342 Research Article Flow of an Eyring-Powell Model Fluid between Coaxial Cylinders with Variable Viscosity Department...
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Proving composite number How do you prove that 1280000401 is a composite number? Hello, RuyHayabusa! How do you prove that 1,280,000,401 is a composite number? . I don't know . . . Now that Ipuchala has factored it, I see a truly far-fetched approach. $1,280,\!000,\!401 \;=\;2^7 (10^7) + 2^2(10^2)+1 \;=\;20^7 + 20^2 +...
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Proof of a congruence problem December 28th 2009, 03:00 AM #1 Proof of a congruence problem Hello ! I'm having this little problem. Prove that if $m$ is prime, then $(m - 2)! \equiv 1 \pmod{m}$. I thought it would be possible to state that $(m - 2)! = \frac{(m - 1)!}{m - 1}$, thus we have $\frac{(m - 1)...
4
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GMAT Probability (Data Sufficiency) • GMAT Prep (USA) • • GMAT Prep (International) • • Favorite GMAT Articles □ 800score GMAT Course Reviews □ GMAT Course Comparision □ GMAT Essay Tips & Grading from 800score • • Free GMAT Prep □ Free G...
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Parametric Equations May 19th 2008, 10:13 PM #1 Junior Member Joined Apr 2008 Posts 45 Parametric Equations I'm having problems with a few parametric equation questions. Considering how much trouble I've been having with this particular unit of work, I expect I'll have to use this thread to ask more ...
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Linear and angular acceleration of a falling cylinder? [long] 1. The problem statement, all variables and given/known data http://img248.imageshack.us/img248/1639/cylinderjl0.jpg A uniform cylinder with a radius of R and mass M has been attached to two cords and the cords are wound around it and hung from the ceiling....
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Patent US20020123953 - Systems and methods for providing robust investment portfolios [0001] This application claims the benefit of U.S. Provisional Application, Serial No. 60/256,150, filed on Dec. 15, 2000, and entitled METHOD FOR ROBUST PORTFOLIO OPTIMIZATION, the disclosure of which is hereby incorporated by refere...
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Laplace shifting problem October 28th 2010, 12:26 AM weedingb Laplace shifting problem Hi, I am trying to solve $y''+4y=0, 0<t<a; exp(-t), t>a$ using Laplace transforms. I end up with $H(t-a)(exp(-(t-a))-cos(2(t-a))+1/2sin(2(t-a))$ where H(t-a) is the Heaviside/unit step function. Is...
5
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Deriving method of moments October 22nd 2010, 01:49 PM #1 Newbie Joined Sep 2010 Posts 14 Deriving method of moments Let's hypothesize that I have n iid observations from a Poisson distribution with parameter lambda, how do I derive the method of moments estimator of lambda? $X_1,...,X_n \sim Poisso...
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Mole question tanya234 Hello, how would i solve the following?: "How many litres of air (78% N2, 22% O2 by volume) are needed for the combustion of 1 litre of octane, C8H18, a typical gasoline component, of density 0.70g/mL?" Note - 1 mole of oxygen gas is equal to 24.5 litres. I have done the chemical equation of ...
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On Stability of a Third Order of Accuracy Difference Scheme for Hyperbolic Nonlocal BVP with Self-Adjoint Operator Abstract and Applied Analysis Volume 2013 (2013), Article ID 959216, 15 pages http://dx.doi.org/10.1155/2013/959216 Research Article On Stability of a Third Order of Accuracy Difference Scheme for Hyperb...
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Orthogonality Preserving Linear Map. November 27th 2012, 09:28 AM #1 Orthogonality Preserving Linear Map. I'm having trouble with the following problem: Let $V$ be a real vector space equipped with an inner product $\langle\cdot,\cdot\rangle$ (and thus with a norm induced by that inner product). Let $T:V...
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An equation in the free associative ring up vote 5 down vote favorite 2 Let $X$ be an alphabet, $u,v,p,q,r,s$ be words in the alphabet $X$. I am looking for four elements in the free associative ring $R$ (i.e. four linear combinations of words in $X$) $x,y,z,t$ such that $$u-v=x(p-q)y+z(r-s)t.$$ Is this problem decida...
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Patent US20040133292 - Generalized envelope matching technique for fast time-scale modification CLAIM OF PRIORITY [0001] This application claims priority under 35 U.S.C. 119(c) from U.S. Provisional Application 60/426,716 filed Nov. 15, 2002. TECHNICAL FIELD OF THE INVENTION [0002] The technical field of this invent...
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Examples : Normal Probability Distribution ┌───────────────────┬────────────────────────────────┐ │General Statistics │ Examples │ │ │Normal Probability Distribution │ └───────────────────┴────────────────────────────────┘ Normal / Continuous Probability Program Normal (z-score ...
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Patent US7974365 - Method and apparatus for computing SIR of time varying signals in a wireless communication system CROSS REFERENCE TO RELATED APPLICATION This application is a continuation of U.S. patent application Ser. No. 12/191,533, filed Aug. 14, 2008, which is a continuation of U.S. patent application Ser. No....
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Patent US7263239 - Method for resizing images using the inverse discrete cosine transform This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 2002-0063600 filed in KOREA on Oct. 17, 2002, which is herein incorporated by reference. BACKGROUND OF THE INVENTION 1. Field of ...
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trajectory flight October 21st 2006, 01:29 PM conman trajectory flight Question is: given the equation for fireworks: f(x) = 24.5t - 4.9t^2 what velocity does the rocket travel at its maximum height? what time would the fuse timer need to be set at to have the rocket explode at maximum height? ...
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Contour Integrals May 20th 2010, 03:33 AM #1 Newbie Joined May 2010 Posts 2 Contour Integrals I'm working on a problem that has contour integrals and checked the answers my professor provided with a solution sheet, however there's a part in the solution sheet I don't understand. This is the question...
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limit of series 1 A January 18th 2011, 10:29 AM #16 MHF Contributor Joined Apr 2005 Posts 15,306 Thanks 1282 The limit of that sequence is $e^x$ as you should be able to recognize the MacLaurin series for $e^x$ However, the derivative of $y= e^x$ is $e^x= y$, not x+ y. If you are trying to us...
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Sum of squares from 0 to 1 March 6th 2008, 08:55 PM #1 Newbie Joined Mar 2008 Posts 4 Sum of squares from 0 to 1 The integral from 0 to 1 of x^2 is equivalent to the integral from 0 to 1 of the sum of the first n squares formula (x(2x+1)(x+1)/6) does anyone know if this is some special occurrence (it's o...
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Abstract Algebra-Isomorphism December 18th 2009, 11:12 AM WannaBe Abstract Algebra-Isomorphism Let A,B be normal sub-groups of a group G. G=AB. Prove that: G/AnB is isomorphic to G/A*G/B Have no idea how to start...Maybe the second isom. theorem can help us... TNX! December 18th 2009, 11:...
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[SOLVED] Differentiation / Integration December 13th 2009, 07:01 PM Ife [SOLVED] Differentiation / Integration Given the velocity and initial postion of a body moving along a coordinate line at time t, find the body's postion at time t. $v = cos \frac{ \pi}{2}t, s(0)=1$ I am sure that my answer is wrong...
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Find Laverne's Rate April 12th 2009, 06:06 AM #1 MHF Contributor Joined Jul 2008 From NYC Posts 1,489 Find Laverne's Rate At 9am, Laverne started from home on a hike to a mountain 12 miles away. After reaching the mountain, he took 1 hour for lunch and then returned over the same route, arriving home...
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Systems of Navier-Stokes Equations on Cantor Sets Mathematical Problems in Engineering Volume 2013 (2013), Article ID 769724, 8 pages http://dx.doi.org/10.1155/2013/769724 Research Article Systems of Navier-Stokes Equations on Cantor Sets ^1Department of Mathematics and Mechanics, China University of Mining and Tech...
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the firework June 3rd 2008, 05:50 PM #1 Newbie Joined Jun 2008 Posts 6 the firework the equation for a firework is h=-5d2+20d+1 h=height above the ground d=horizontal distance What would the max height of the firework be? I am going to assume two things..firstly d2=dē and secondly, tha...
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Integration using substitution February 12th 2008, 02:17 AM #1 Member Joined Mar 2007 From England Posts 104 Integration using substitution I'm stuck on the following question: Use the subsitution t=sinhx to find: $<br /> \<br /> \int_0^a {\sqrt {(1 + t} ^2 )dt} <br /> \<br />$ I used ...
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Patent US7298296 - Real-time sample rate converter having a non-polynomial convolution kernel BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to digital audio and audio-video systems, and more specifically, to a real-time sample rate converter and method that use non-line...
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Probability Proof February 3rd 2011, 04:46 PM #1 MHF Contributor Joined Mar 2010 From Florida Posts 3,093 Thanks 5 Probability Proof Let A and B be events in a sample space with positive probabilities. Prove that $P(B|A)>P(B)\iff P(A|B)>P(A)$ The seems relatively easy. 1st direction: $P...
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Sensitivity of methods for estimating breeding values using genetic markers to the number of QTL and distribution of QTL variance Abstract The objective of this simulation study was to compare the effect of the number of QTL and distribution of QTL variance on the accuracy of breeding values estimated with genomewide ...
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For how many ordered pairs (x, y) that are solutions of the Author Message TAGS: For how many ordered pairs (x, y) that are solutions of the [#permalink] 14 Jan 2011, 15:40 ...
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harder gradient June 18th 2008, 02:27 AM Paulo1913 harder gradient This is the question: The gradient of the line joining (-1,3) to (p,q) is -2. The gradient of the line joining (p,q) to (5,2) is -1. Calculate the values of p and q What I have done is created two equations: (q-3)/(p--1)=-2 and...
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find the critical numbers of the function: October 26th 2009, 04:28 PM hazecraze find the critical numbers of the function: $f(x)=x^\frac{4}{5}(x-4)^2$ find the critical numbers of the function: $f'(x)=\frac{4}{5}x^\frac{-1}{5}(x-4)^2 + 2(x-4)(x^\frac{4}{5})<br />$ factor a term out: $x^\frac{-...
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Math Help need help solving this diff plz 3y´ - y = 5x I may be wrong, but i don't think you can solve that because there is only one equation and two unknowns. Hello again, yes I know its a diff equation but I would need some guidence and help solving it =). thank you You can use an integrating factor: First $y' -...
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Simple Harmonic Motion Derivation of frequency June 9th 2011, 08:27 AM #1 Junior Member Joined Mar 2011 Posts 68 Simple Harmonic Motion Derivation of frequency Ok i know how to deduce the angular frequency for the basic problem of: $\frac{d^{2}x}{dt^{2}} = -\frac{kx}{m}$ You simple do: $x = -...
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finding cdf of standard uniform November 23rd 2010, 03:17 PM #1 Junior Member Joined May 2010 Posts 42 finding cdf of standard uniform A question about unifrom rv. If $X \;and\; Y$ are independent $standard \;uniform$ random variables. and we want to find the cumulative distribution of $X-2Y$ t...
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How to handle negative momentum We have a variable-inertia flywheel coupled by a shaft to a fixed inertia flywheel. The VIF (variable-inertia flywheel) has a moment of inertia range of 10 to 5 (m2*kg) and an initial velocity of 100 (rad/s). The fixed inertia flywheel (fw) has a MI (moment of inertia) of 10. The initial...
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Average power used by circuit? 1. The problem statement, all variables and given/known data If the rms voltage across the generator is 149 V, calculate the average power P(at 402 Hz) being used by the circuit. R = 298 Ω, a capacitance C = 4.1 μF, inductance of L = 0.23 H 2. Relevant equations V=IR Avg power=Vrms...
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Patent US3573380 - Single-sideband modulation system United States Patent SINGLE-SIDEBAND MODULATION SYSTEM Field of Search 179/15 (SSB),15(AEC),15(ACS);332/45,9,l0 Primary ExaminerKathleen H. Claffy Assistant ExaminerTom DAmico Attorneys-R. J. Guenther and William L. Keefauver ABSTRACT: A multichannel, frequency-divi...
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Integrals with no limits. (Backwards differientation) Consider this problem: given a function f(x), we wish to find a function F(x) such that F'(x) = f(x). The process is called antidifferentiation and F(x) is called an antiderivative of f(x). This "general" problem arises in various applications. Consider this proble...
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Intersections of 2 lines September 3rd 2009, 03:06 AM #1 Junior Member Joined May 2008 Posts 45 Intersections of 2 lines Ok in this question, I can't draw graphs or use a calculator (I'm really wishing I could) but I need to find the intersection(s) of $y=\sqrt{x}$ and y=-x+2 I keep getting (1,4) or...
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Series and Sequence Covergence Show that if $\sum |a_{n} - a_{n+1}|<\infty$ then the sequence { $a_{n}$} converges, but not conversely. Notice that $a_n=a_0+\sum_{k=1}^{n-1} (a_{k+1}-a_k)$, so that $(a_n)_{n\geq 0}$ converges if, and only if $\sum_k (a_{k+1}-a_k)$ is a convergent series. If a series is absolutely conv...
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Find another point on the curve with the same tangent. February 20th 2011, 06:54 AM RogueDemon Find another point on the curve with the same tangent. Question: Find the equation of the tangent to $y = 8x^4 + 40x^3 + 26x^2 - 63x + 24$ at the point (3,-15). Find another point on the curve which has exactly th...
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Interest, compounded quarterly.. July 7th 2009, 03:08 AM #1 Newbie Joined Jul 2009 Posts 11 Interest, compounded quarterly.. I am unsure/unaware of the formula and how to use it to complete this problem. Any help is greatly appreciated. Art invests $2700 in a savings account that pays 9% interest, c...
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prove this analysis claim Assume there is a c in (0,1) such that f(c)>0, then (by the mean value theorem) there are points u in (0,c) and v in (c,1) such that f'(u)>0 and f'(v)<0. But f''(x)>=0, x in [0,1] implies that f'(x) is non-decreasing on [0,1], which contradicts the above. Hence there is no point c in (0,1) suc...
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Proof Help November 29th 2012, 04:37 PM #1 Newbie Joined Jul 2008 Posts 17 Proof Help Given: PSTV is a parallelogram; PQ is congruent to RQ Prove: Angle STV is congruent to angle R Please see my attachment for the actual information. Thank you in advance for any help. I cannot figure out ho...
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SAT problem help October 10th 2006, 05:57 PM #1 mets9131 Guest SAT problem help For Pre calc cannot figure this out even though I know it is simple A standard 8 1/2 X 11 inch sheet of paper is rolled along its short side to for a cylinder that is 8 1/2 inches high A second sheet of standard 8 1/2 X 11 i...
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Factor Formula March 19th 2008, 12:58 AM #1 When my textbook proving $\frac{d}{dx}(sin\theta)=cos\theta$, it mentions about "Factor Formula", but it never mention it detailly, so I don't understand it. Can anyone tell me what is "Factor Formula"? To find $\lim_{\theta \rightarrow 0}{\frac{sin\theta}{\...
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On Asymptotically Lacunary Statistical Equivalent Set Sequences Journal of Mathematics Volume 2013 (2013), Article ID 310438, 5 pages http://dx.doi.org/10.1155/2013/310438 Research Article On Asymptotically Lacunary Statistical Equivalent Set Sequences Department of Mathematics, Faculty of Science and Literature, Af...
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Using a Barometer to Determine Altitudes VocExile Main Menu /Determining Altitudes Using a Barometer to Determine Altitudes By Ed Perley Do you ever wonder how deep that ravine behind you house is? Or how high that hill above your town is? Or how tall is the that big building on main street? You can easily estimate ...
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Unions of subspaces September 8th 2009, 11:38 AM #1 Unions of subspaces Question: Let $W_1, W_2$ be subspaces of vector space $V$. Prove that $W = W_1 \cup W_2$ is a subspace of $V$ if and only if $W_1 \subseteq W_2$ or $W_2 \subseteq W_1$. I managed to prove it one way. I managed to show that if $W_1 \subse...
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Ted Odell I was shocked and saddened to hear about a week ago that Ted Odell, a mathematician to whom I owe a lot, died suddenly on January 9th of a heart attack while he was travelling to this year’s joint AMS/MAA meeting in San Diego. He was 65, but seemed a lot younger. Ted was a world leader in Banach space theor...
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Recurrence relations November 30th 2010, 03:19 AM #1 Junior Member Joined Nov 2010 Posts 41 Recurrence relations If I have a recurrence relation such as: $a(n) = A*a(n-1) + B*a(n-2)$ where $a(0)=X, a(1)=Y$ how do I solve this? Wikipedia explains how to solve such an equation and I used it an...
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Rog's Rag-bag Maths, logic, trivia, puns, general silliness - an assortment of stuff too disparate to go under any other title. In other words, same old rubbish. -1. A rebus: 012356789DRACULA -2. Give me a word that will fit in with the following group and explain why: settee, raccoon, embarrass -3. Two travellers ...
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Reliable RANSAC Using a Novel Preprocessing Model Computational and Mathematical Methods in Medicine Volume 2013 (2013), Article ID 672509, 5 pages http://dx.doi.org/10.1155/2013/672509 Research Article Reliable RANSAC Using a Novel Preprocessing Model ^1School of Computer Science and Technology, Zhejiang University...
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Math Help March 26th 2007, 10:41 PM #1 Junior Member Joined Mar 2007 Posts 34 proof If n is an integer that is NOT a multiple of 3, then n^2 = 1 mod 3 I did ... to the contrary, if n is a multiple of 3 then n = 0 mod 3 then n^2 is also a multiple of 3 -> n^2 = 0 mod3 reaching a contraditi...
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Integral Problem ? use $\sin (x) = 2 \sin (\frac{x}{2}) \cos (\frac{x}{2})$ $\displaystyle \int_0^{\frac{\pi}{2}}\ln (\sin(x))\;dx = \int_0^{\frac{\pi}{2}} \ln(2\sin(x/2)\cos(x/2))\dx$ $\displaystyle = \int_0^{\frac{\ pi}{2}} \ln(2)\;dx+\int_0^{\frac{\pi}{2}} \ln(sin(x/2))\;dx+\int_0^{\frac{\pi}{2}} \ln(\cos(x/2))\;dx$...
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Re: Probability for the first digit of a natural number being equal to 1 The definition of logarithmic density of some subset [itex]A\in\mathbb N[/itex] is [tex] \delta(A) \equiv \lim_{n\to\infty} \frac{\,\,\displaystyle {\sum_{\substack{r<=n,\\r\in A}}\frac 1 r}\,\,} {\displaystyle \sum_{r=1}^n\frac 1 r} [/tex] ... ...
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Groups - Quotient groups August 12th 2010, 01:54 AM #1 Member Joined Jul 2009 Posts 168 Groups - Quotient groups Let G be a group, A be a group of all elements in G that have a finite order. Prove that the quotient group G/A contains no elements of finite order. Hmmm... If I assume that there i...
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Calculating convertable energy Oh OK... You want to know the power in the movement of the water given the water speed (v=6.6m/s) and the volume flow rate (dV/dt = 5gpm). Numbers off post #1. I'll walk you through the stages - the trick is to keep in mind what everything means so it's not just an abstract calculation....
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word problem equations February 8th 2008, 02:58 PM #1 Member Joined Apr 2006 Posts 85 word problem equations I hope you guys can help me... because it's easy but for some reason I can't figure it out? -.- 1) Two hundred people attend a concert. The total receipts are $4500. If one student ticket cos...
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Curved Coordinate Systems and Fictitious Forces Aristotle argued that the idea of motion in a vacuum is unintelligible, because he regarded position as the fundamental attribute of an object’s state, and any change in the state of an object requires a “force” – essentially by definition. Thus to explain why a stone co...
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I need help making up a skewed PDF March 7th 2011, 03:40 PM #1 Newbie Joined Mar 2011 Posts 14 I need help making up a skewed PDF Basically I need to make up a PDF that is skewed enough that it wont really fit the CLT unless I have a large number of observations. I have no idea how to just make one up (I...
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[SOLVED] Prove the existence of quadratic roots January 30th 2009, 01:13 PM zhupolongjoe [SOLVED] Prove the existence of quadratic roots If ab>0 and bc<0, then ax^2+bx+c=0 has two real solutions. (Prove this) I started, but I don't know. Let a, b, c be real. Assume ab>0 and bc<0. So bc<ab S...
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Patent US5978489 - Multi-actuator system for active sound and vibration cancellation This is a Continuation-in-Part of Provisional Application 60/045,881 filed May 5, 1997. The present invention is directed to a multi-actuator system for active sound and vibration cancellation and more specifically to a system where m...
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Chaos Theory Problem April 19th 2010, 05:58 PM Khonics89 Chaos Theory Problem The one-dimensional mapping x(n+1) =ax^2(n)(1 − x(n)) has been used as a toy model for the sunspot cycle. 0 < x(n) < 1 and 0 < a< 6.75; here x(n) is the phase space variable, and a is a parameter. (a) Show algebrai...
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infinite sequence December 6th 2011, 10:01 PM jaqueh infinite sequence What does the series converge to where [a_1]=√12 [a_n+1]=√(12+a_n) ? I tried: L = √(12+√(12+√(12+...))) then L^2 = 12+√(12+√(12+...)) then L^∞ = 12^∞ + 12^∞-1...+12 thus L = ∞√(12^∞ + 12^∞-1...+12) but i dont thin...
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Cartesian equation. August 9th 2009, 05:22 PM Murphie Cartesian equation. Would someone mind telling me how to find the indicated direction in the problem below? Help with (b) would also be greatly appreciated! (a) Graph the parametrized curve described by x = 2 cos t, y = -sin t, 0≤t≤pi. Indicate the direc...
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double integration December 1st 2009, 11:31 AM #1 Newbie Joined Jul 2009 Posts 16 double integration can someone help me solve it? (integral from 0 to 4) dx (integral form x/2 to x^1/2) dy (x^2 - y^1/2)= I ended up with: (76/56) - (64*2^1/2)/21 + 64/(15*2^1/2) help!!! Hey, maybe ...
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Rectangle and Ellipse June 16th 2009, 11:02 AM #1 Junior Member Joined Jun 2009 Posts 58 We have a Rectangle with sides parallel to axes (x and y). The rectangle is inside of the Ellipse $x^2/a^2$$+$$y^2/b^2$$= 1$ $a$and $b$> $1$. Calculate the dimensions of the rectangle with maximum area. ...
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[ 0.0194091796875, -0.05712890625, -0.042724609375, -0.083984375, -0.052978515625, -0.03955078125, -0.0380859375, 0.0201416015625, 0.038330078125, -0.03662109375, -0.0262451171875, 0.06689453125, 0.01519775390625, 0.037841796875, -0.0167236328125, 0.1318359375, 0.07177734375, -0.0412...
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Brevet US3566267 - Burst synchronization method and apparatus L. s. comma 3,566,267 BURST SYNCHRONIZATION METHOD AND APPARATUS Filed Oct. 30, 1968 3 Sheets-Sheet 1 HGI F AM E 2 5 sec r 1 ETIFllAIIBIICIIDlIEIIFIIAIFB I FIG 2 INVENTOR LEONARD SHELDON GOLDING L L MMML J BY 5 PM 1mg 2:; VAC ow ATTORNEYS Feb. 23, 1971 File...
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[ -0.08056640625, -0.08544921875, -0.0299072265625, -0.01055908203125, -0.039306640625, -0.048583984375, 0.01177978515625, 0.07958984375, -0.046875, -0.0011444091796875, 0.016357421875, 0.031494140625, 0.033447265625, -0.08203125, -0.052978515625, -0.021240234375, 0.08056640625, -0.0...
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Second Order Difference Equation- Cournot April 5th 2009, 02:30 AM #1 Newbie Joined Apr 2009 Posts 9 Second Order Difference Equation- Cournot Hi , i hope someone can help me with this. I am aware of how to solve diffrence equations however unsure about how to approach this. any help greatly appreciated....
5
[ -0.07275390625, -0.029052734375, 0.0079345703125, -0.04296875, 0.00653076171875, 0.042724609375, -0.0245361328125, 0.017578125, -0.0191650390625, -0.019287109375, 0.0308837890625, 0.0302734375, -0.080078125, -0.01226806640625, 0.056884765625, 0.01611328125, -0.061279296875, -0.0480...
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