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Power series expansion January 8th 2009, 02:09 AM #1 Member Joined Oct 2008 From Melbourne Posts 166 "By adapting the power series expansion (centred on c = 0) of $h(t) = \frac{1}{1-t}$ , write down a power series expansion (with the indicated centre) for each of the following functions, and indic...
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Proof by induction May 15th 2013, 11:29 PM #1 Newbie Joined May 2013 From morroco Posts 14 Thanks 1 Proof by induction Hello guys could anyone help find a solution to this problem, Show that: 3 x 5^(2n-1) + 2^(3n-2) is divisble by 17 (for every n on N*) This is what i did : ver...
4
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help bivariate March 22nd 2008, 03:42 AM gracey help bivariate Five observations of bivariate data produce the following results, denoted as (xi, yi)for i =1, 2, 3, 4, 5. (13, 2.7) (13, 4.0) (18, 2.8) (23, 3.3) (23, 2.2) [Σ x = 90, Σ y = 15.0, Σ x2 = 1720, Σ y2 = 46.86, Σ xy = 264.0.] The regressi...
4
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4 Manifolds all of whose geodesics are lines Next: 5 Conclusion Up: Axiomatic and Coordinate Geometry Previous: 3 Riemannian Geometry In order to tie up the first two sections we need to have a notion analogous to lines in a general Riemannian manifold--this is provided by geodesics or energy minimising paths. T...
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problem with sequence and means June 24th 2012, 02:16 AM #1 Member Joined Jun 2010 From Zewail University - Cairo - Egypt Posts 136 problem with sequence and means the A.S mean of two no.s : 8,2x^2 exceeds their positive G.M by 9 .Find X i got it 5, -5 is that right? Re: problem with sequence an...
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Solving log/exponential problem February 17th 2011, 03:59 PM #1 Newbie Joined Feb 2011 Posts 15 Solving log/exponential problem So I have a question about this problem: 5e^2-x = 7e^x i know you need to apply Ln to both sides, but first can you bring the 5 up to the exponent? or does this not ap...
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Proof that Upper Riemann Integral > Lower Riemann Integral...? August 3rd 2007, 04:00 PM #1 Junior Member Joined Aug 2007 Posts 45 heyyy guys.... im new at this level of maths so i would appreciate a lil bit of help here and there i want to show that lower riemann integral $\int^b_a f(x)dx \l...
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the encyclopedic entry of Continuously Compounded Real Return Nominal return Let p[t] be the price of a security at time t , including any cash dividends or interest , and let p[t − 1] be its price at t − 1. Let RS[t] be the simple return on the security from t − 1 to t , $1 + RS_\left\{t\right\}=...
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Model Reduction Using Proper Orthogonal Decomposition and Predictive Control of Distributed Reactor System Journal of Control Science and Engineering Volume 2013 (2013), Article ID 763165, 19 pages http://dx.doi.org/10.1155/2013/763165 Research Article Model Reduction Using Proper Orthogonal Decomposition and Predict...
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Geometric series and such.. February 21st 2007, 05:10 PM #1 Member Joined Nov 2006 From chicago Posts 156 Geometric series and such.. The sum of an infinite geometric series is 36. The second term of the series is 8. Find two possibilities for combinations of a (the first term) and r (the common rati...
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A question out of curiosity.... April 11th 2012, 01:16 PM #1 Newbie Joined Apr 2012 From London Posts 3 Thanks 1 A question out of curiosity.... Can a number have 2 square roots? If you say no, surely 4 has 2 squared and minus 2 squared bothe as square roots? Do minus numbers get involved in squa...
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Joint PDF May 6th 2009, 04:35 AM panda* Joint PDF The joint probability distribution is given by, $f_{(X,Y)}(x,y) = 2$ if $0 \leq x \leq y \leq 1$, 0 otherwise. (i) Determine the marginal density functions of X and Y. Check that it is indeed a pdf. (ii) Calculate the means $\mathbb{E}X$ and VarX. ...
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Math Help April 7th 2006, 06:24 AM #1 Newbie Joined Apr 2006 Posts 3 integration hi, is there any method of integrating a hyperbolic or trignometric function whos degree is 4, such as (tanx)^4, (cosechx)^4 WITHOUT resorting to reduction formulae?? Sure, there just isn't a "golden recipe" which will...
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Lecture 16: Continuation: More General Periods Okay, that's, so to speak, the text for today. The Fourier series, and the Fourier expansion for f(t), so f of t, if it looks like this should be periodic, and two pi should be a period. Sometimes people rather sloppily say periodic with period two pi, but that's a little ...
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Polynomials and rational functions July 12th 2010, 03:25 AM Glitch Polynomials and rational functions The question asks "State whether the function is a polynomial, a rational function (but not a polynomial), or neither." This is the function: $F(x) = \frac{x^3 - 3x^{3/2} + 2x}{x^2 - 1}$ It looks ...
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A Stochastic Two Species Competition Model: Nonequilibrium Fluctuation and Stability International Journal of Stochastic Analysis Volume 2011 (2011), Article ID 489386, 7 pages http://dx.doi.org/10.1155/2011/489386 Research Article A Stochastic Two Species Competition Model: Nonequilibrium Fluctuation and Stability ...
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Norm of an Operator April 19th 2010, 02:12 PM ejgmath Norm of an Operator I need to show that the operator $T:L^2([0,1],\mathbb{R}) \rightarrow L^2([0,1],\mathbb{R})$ defined by $(Tf)(x)=xf(x)$ has norm 1 There is a hint on the question saying show it must be at least $1-\frac{1}{n}$ for all $n$ The no...
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Solving system of ODE's November 29th 2009, 04:45 PM #1 Newbie Joined Nov 2009 Posts 19 Solving system of ODE's I have a 2 seperate systems i am trying to solve but don't seem to know any technique that will solve this problem (the other is similar in nature to this one) Problem: $\frac{dC_{0}}...
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eccentricity application May 23rd 2009, 11:40 PM #1 Junior Member Joined Feb 2009 Posts 34 eccentricity application can someone help me with this problem ( I'm quite new with some terms) A satellite is to be placed in an elliptical orbit, with the center of the earth as one focus. The satellite's ma...
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Optimization of GMAW Process Parameters Using Particle Swarm Optimization ISRN Metallurgy Volume 2013 (2013), Article ID 460651, 10 pages http://dx.doi.org/10.1155/2013/460651 Research Article Optimization of GMAW Process Parameters Using Particle Swarm Optimization ^1Department of Mechanical Engineering, Valia Koon...
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Linear Matrix Inequalities in Multirate Control over Networks Mathematical Problems in Engineering Volume 2012 (2012), Article ID 768212, 22 pages http://dx.doi.org/10.1155/2012/768212 Research Article Linear Matrix Inequalities in Multirate Control over Networks Departamento de Ingeniería de Sistemas y Automática, ...
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Help me in derivation of limit in limits for 1^∞ type of indeterminate form, the direct solution is e^{g(x)[f(x)-1]} I am not sure what you mean by "direct solution" but you can convert the form so L'hosiptials rule can be used. If $\lim_{x \to \infty} f(x)=1$ and $\lim_{x \to \infty} g(x)=\infty$ then $[f(x)]^{g (x)}...
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when is this true for integral what is the condition for this statement to be true? Use the definition of the derivative. $f'(x)=\lim_{h \to 0}\frac{\sqrt{x+h}-\sqrt{x}}{h}$ Multilpy the numerator and denominator by the conjugate to get $f'(x)=\lim_{h \to 0}\frac{\sqrt{x+h}-\sqrt {x}}{h}\left( \frac{\sqrt{x+h}+\sqrt{x...
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Proposition 2 If, when the less of two unequal magnitudes is continually subtracted in turn from the greater that which is left never measures the one before it, then the two magnitudes are incommensurable. There being two unequal magnitudes AB and CD, with AB being the less, when the less is continually subtracted i...
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Modeling and Control for Giant Magnetostrictive Actuators with Rate-Dependent Hysteresis Journal of Applied Mathematics Volume 2013 (2013), Article ID 427213, 8 pages http://dx.doi.org/10.1155/2013/427213 Research Article Modeling and Control for Giant Magnetostrictive Actuators with Rate-Dependent Hysteresis School...
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Strong Pullback Attractors for Nonautonomous Suspension Bridge Equations ISRN Applied Mathematics Volume 2014 (2014), Article ID 253532, 8 pages http://dx.doi.org/10.1155/2014/253532 Research Article Strong Pullback Attractors for Nonautonomous Suspension Bridge Equations College of Mathematics and Statistics, North...
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Soliton Solutions for the Wick-Type Abstract and Applied Analysis Volume 2012 (2012), Article ID 327682, 9 pages http://dx.doi.org/10.1155/2012/327682 Research Article Soliton Solutions for the Wick-Type Stochastic KP Equation ^1Department of Information and Computation of Science, Guangxi University of Technology,...
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u-sub integration help April 29th 2009, 03:13 PM #1 Newbie Joined Apr 2009 Posts 1 u-sub integration help guys first timer here. cant quite figure this one out. ʃ dt/ t√(5tē-3) it looks to me to be a sec^-1u type of question but i cant seem to find the correct u value. any help from you smar...
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Need some help ! newbie here ! January 11th 2013, 05:55 PM #1 Need some help ! newbie here ! hi i'm Jhaycian Velasquez 19 years of age an engineering student can u please help me out of this give me some figure two observers who are 2 miles apart on a horizontal plane observe a balloon in a same vertica...
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Simple Interest Challenge Problem October 7th 2012, 01:58 PM #1 Newbie Joined Oct 2012 From Alberta Canada Posts 6 Simple Interest Challenge Problem A father wanted to show his son what it might be like to borrow money from a financial insitution. When his son asked if he could borrow $120 the father...
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Compact, bounded, closed-range operators on Hilbert spaces have finite rank May 26th 2012, 12:54 AM UniversityMathsStudent Compact, bounded, closed-range operators on Hilbert spaces have finite rank Hi, I am trying to prove that if $T:H\to{H}$ is a compact, bounded operator with closed range, where $H$ is a...
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STATS_MW_TEST Description of the illustration stats_mw_test.gif A Mann Whitney test compares two independent samples to test the null hypothesis that two populations have the same distribution function against the alternative hypothesis that the two distribution functions are different. The STATS_MW_TEST does not as...
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Factorisation what about $(x^3+i)(x^3-i)$ expanding back out to check $x^6+x^3i-x^3i-i^2$ $x^6-i^2$ $x^6-(-1)$ $x^6+1$ If you're factorising over the Real Numbers, it does not factorise. If you're factorising over the Complex Numbers, change it to a difference of two squares. $x^6 + 1 = (x^3)^2 - i^2$ $= (x^3 + i)(x^ ...
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[SOLVED] Functions March 22nd 2009, 08:53 AM #1 Member Joined Jan 2009 From earth Posts 167 Given $f(x)= x^2 -2x +7$ and $g(x)= 2x-3$ find a. $(f+g)(2)$ b. $(f.g)(2)$ c. $(f/g)(2)$ d. $(f.g)(x)$ Thanks in advance. I don't even know where to start $(f+g)(2)=f(2)+g(2)$ ...
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An Alternative Method for the Study of Impulsive Differential Equations of Fractional Orders in a Banach Space International Journal of Differential Equations Volume 2013 (2013), Article ID 191060, 12 pages http://dx.doi.org/10.1155/2013/191060 Research Article An Alternative Method for the Study of Impulsive Differe...
5
[ -0.10693359375, -0.019287109375, 0.0576171875, 0.024169921875, 0.032470703125, 0.020263671875, -0.02685546875, 0.021728515625, 0.07373046875, 0.014404296875, 0.049560546875, 0.0390625, 0.03271484375, 0.0225830078125, -0.04296875, 0.043701171875, 0.035888671875, -0.044189453125, -...
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-Adic Hardy Operators and Their Commutators on Journal of Function Spaces and Applications Volume 2013 (2013), Article ID 359193, 10 pages http://dx.doi.org/10.1155/2013/359193 Research Article Boundedness of -Adic Hardy Operators and Their Commutators on -Adic Central Morrey and BMO Spaces Department of Mathematic...
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[ -0.04150390625, -0.01080322265625, -0.0263671875, -0.00042724609375, 0.038330078125, 0.030517578125, 0.059326171875, 0.03369140625, 0.031494140625, -0.06689453125, -0.0223388671875, 0.026123046875, 0.02099609375, -0.0419921875, -0.01531982421875, -0.00775146484375, -0.059814453125, ...
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Dice Calculation for Tabletop RPG July 26th 2010, 01:17 PM #1 Newbie Joined Jul 2010 Posts 2 Dice Calculation for Tabletop RPG Thanks for your time. I believe this would fit under the Calculus heading since it appears to be related to finding the maxima of a nonlinear function, though I'm not sure. ...
4
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Integration by parts February 7th 2010, 06:17 AM #1 Newbie Joined Feb 2010 Posts 22 Integration by parts Integrate (x^3 dx) / square root of (1-x^2) i have to integrate it by parts. i already tried it but my answer waa 0=0 is that possible? how? let u = x^3 du = 3x^2 dx0 dv = dx / sq r...
5
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Math Help April 30th 2009, 06:48 AM #1 Newbie Joined Apr 2009 Posts 8 Matrices The matrix ( 1 2) maps Q(1,2) to R(5,7). (1 3) Find the 2 x 2 matrix which maps R back to Q. Help please. I will guess that you meant to say the following: Code: The matrix [ 1 2 ] ...
5
[ -0.04931640625, 0.0203857421875, -0.064453125, -0.0040283203125, -0.050048828125, -0.00113677978515625, 0.045166015625, -0.034912109375, -0.037353515625, 0.03173828125, 0.01385498046875, -0.0218505859375, 0.01513671875, 0.013916015625, -0.04736328125, 0.06689453125, -0.099609375, 0...
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Few pratice problems that I'm having trouble with. March 25th 2007, 02:21 PM #1 Newbie Joined Mar 2007 Posts 6 Few pratice problems that I'm having trouble with. A lighthouse is located 3km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is ...
5
[ 0.04150390625, -0.029052734375, -0.01123046875, -0.050537109375, 0.0034637451171875, -0.07861328125, -0.0062255859375, 0.0091552734375, -0.031005859375, -0.001434326171875, 0.04443359375, 0.0294189453125, -0.0240478515625, 0.034423828125, 0.04931640625, 0.099609375, -0.015380859375, ...
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containing all sub-array combinations of Minimal arrays containing all sub-array combinations of symbols: De Bruijn sequences and tori For n symbols in m groups, what are the smallest arrays that contain all combinations of adjacent elements? This is a symbolic combinatorics question. It shares some characteris...
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[ 0.06787109375, 0.0189208984375, 0.0308837890625, -0.09521484375, -0.09228515625, -0.0277099609375, -0.0047607421875, -0.060302734375, 0.0089111328125, -0.01263427734375, 0.01129150390625, 0.038330078125, 0.06396484375, -0.0012359619140625, -0.0225830078125, 0.138671875, 0.00842285156...
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The Matrix Linear Unilateral and Bilateral Equations with Two Variables over Commutative Rings ISRN Algebra Volume 2012 (2012), Article ID 205478, 14 pages http://dx.doi.org/10.5402/2012/205478 Research Article The Matrix Linear Unilateral and Bilateral Equations with Two Variables over Commutative Rings Pidstryhach...
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[ -0.0458984375, 0.0546875, -0.03662109375, 0.017333984375, -0.08740234375, -0.01300048828125, -0.00958251953125, -0.004730224609375, 0.0294189453125, -0.052001953125, 0.10009765625, 0.03173828125, 0.039794921875, 0.04443359375, -0.03173828125, -0.0172119140625, -0.041259765625, 0.06...
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Practice Math Kangaroo Problems 11 to 15, Level 0304 Problem Kangur_2002_0304_11 (4 pts) http://www.mathkangaroo.org This picture below is a sketch of a castle. Which of the lines below does not belong to the sketch? A) B) C) D) E) Solution: Answer: C. This is a somewhat tricky image/shape recognition problem in wh...
4
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Generalized Mittag-Leffler Function Associated with Weyl Fractional Calculus Operators Journal of Mathematics Volume 2013 (2013), Article ID 821762, 5 pages http://dx.doi.org/10.1155/2013/821762 Research Article Generalized Mittag-Leffler Function Associated with Weyl Fractional Calculus Operators ^1Department of Ma...
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Worksheet on Co-ordinate Triangle |Area of a Triangle|Formula|Polar Co-ordinates Worksheet on Co-ordinate Triangle In the worksheet on co-ordinate triangle we need to find the area of a triangle where the three co-ordinates of the vertices are given. Let us recall the formula for finding the area of a triangle fo...
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[ -0.0001373291015625, -0.033935546875, -0.07470703125, -0.0625, 0.005340576171875, -0.0751953125, -0.024658203125, -0.01483154296875, 0.005950927734375, -0.04931640625, 0.035400390625, -0.035888671875, -0.05517578125, 0.036376953125, 0.11767578125, 0.0634765625, -0.08154296875, -0.0...
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-Norm Algorithm for MRI Phase Unwrapping Computational and Mathematical Methods in Medicine Volume 2014 (2014), Article ID 134058, 11 pages http://dx.doi.org/10.1155/2014/134058 Research Article Sparse-Representation-Based Direct Minimum -Norm Algorithm for MRI Phase Unwrapping ^1Department of Biomedical Engineering...
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[ -0.04931640625, 0.006072998046875, 0.021728515625, -0.08447265625, 0.01220703125, -0.04150390625, -0.027587890625, -0.01031494140625, -0.0693359375, -0.03564453125, -0.064453125, 0.054443359375, 0.09228515625, 0.0927734375, -0.11767578125, 0.010009765625, -0.09716796875, -0.0559082...
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An Approximate Quasi-Newton Bundle-Type Method for Nonsmooth Optimization Abstract and Applied Analysis Volume 2013 (2013), Article ID 697474, 7 pages http://dx.doi.org/10.1155/2013/697474 Research Article An Approximate Quasi-Newton Bundle-Type Method for Nonsmooth Optimization ^1School of Mathematics, Liaoning Nor...
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[ -0.0634765625, 0.00830078125, 0.01287841796875, -0.0810546875, 0.0263671875, 0.02734375, -0.01318359375, -0.0147705078125, -0.037841796875, 0.076171875, 0.0260009765625, 0.0167236328125, 0.033447265625, 0.05126953125, -0.03662109375, 0.0181884765625, 0.042724609375, 0.02734375, -...
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Trig Identity? December 13th 2010, 06:31 PM #1 Newbie Joined May 2010 Posts 9 Trig Identity? I recently read somewhere that $sin(\theta)=\frac{y}{\sqrt{y^2+x^2}}$, but I cannot seem to find this identity anywhere on the internet. Does anyone know what this is called, or where I can find the same iden...
4
[ -0.0888671875, -0.05419921875, -0.10693359375, 0.0010986328125, 0.053466796875, -0.02685546875, -0.038818359375, -0.02294921875, 0.09033203125, -0.032958984375, 0.09375, 0.08544921875, -0.041015625, 0.1259765625, 0.0296630859375, 0.0218505859375, -0.038818359375, 0.08154296875, 0...
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Torque question May 4th 2010, 09:03 AM #1 Super Member Joined Nov 2008 Posts 597 Torque question I just started torque so excuse me for asking a stupid question but I'm stuck trying to do the following question: "A wheel starts from rest and rotates through 150 rad in 5 s. The net torque due to the ...
5
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Proposition 14 In equal and equiangular parallelograms the sides about the equal angles are reciprocally proportional; and equiangular parallelograms in which the sides about the equal angles are reciprocally proportional are equal. Let AB and BC be equal and equiangular parallelograms having the angles at B equal, a...
4
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Summation proof February 10th 2010, 10:58 AM #1 Newbie Joined Feb 2010 Posts 3 Summation proof Prove that $n*\sum_{i=0}^nx_i^2 \geq (\sum_{i=0}^nx_i)^2$ I tried proving it directly using summation identities. I then tired using induction, but I kept getting stuck. A proof similar to this may be...
5
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the encyclopedic entry of quantum electrodynamics Quantum electrodynamics ( QED ) is a relativistic quantum field theory of electrodynamics . QED was developed by a number of physicists, beginning in the late 1920s. It basically describes how light and matter interact. More specifically it deals with the interac...
4
[ -0.1259765625, -0.0164794921875, -0.0380859375, 0.09814453125, -0.1103515625, 0.0101318359375, 0.02685546875, 0.08642578125, 0.07275390625, 0.03369140625, 0.047607421875, -0.017333984375, -0.01153564453125, 0.06884765625, -0.028076171875, 0.01123046875, 0.034423828125, -0.037597656...
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integration with factorials January 14th 2009, 04:43 PM #1 Member Joined Jan 2009 Posts 91 integration with factorials im having a lot of trouble showing that the definite integral from 0 to 1 (ln x)^n dx = n!(-1)^n if someone could help get me started cause i have no idea how to get the factori...
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[ -0.01129150390625, -0.0478515625, 0.0281982421875, -0.008056640625, -0.015869140625, -0.05908203125, 0.025634765625, -0.0021820068359375, -0.04296875, -0.027587890625, 0.04296875, -0.006927490234375, -0.04150390625, -0.00921630859375, -0.07080078125, -0.0184326171875, 0.03466796875, ...
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Maximum possible volume June 6th 2011, 08:29 AM #1 Super Member Joined Dec 2009 Posts 755 Maximum possible volume A circular hollow cone of height h and semi-vertical angle $30^o$ stands on a horizontal table. An upright cylinder of radius $r$ cm and height $d$ cm just fits into the cone as shown in ...
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[ 0.01190185546875, 0.048828125, -0.01275634765625, -0.047119140625, -0.0238037109375, -0.07568359375, -0.0181884765625, 0.126953125, -0.0301513671875, 0.0135498046875, -0.0693359375, 0.01214599609375, 0.031005859375, 0.09326171875, 0.0172119140625, -0.0142822265625, 0.02392578125, 0...
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integration partial fractions integral of (u+4)/((u^2)+4) du How would I solve for this? THere is no need for partial fractions here $\int\frac{u+4}{u^2+4}du=\int\frac{u}{u^2+4}du+4\in t\frac{du}{u^2+4}=\frac{1}{2}\ln|u^2+4|+2\arctan\b igg(\frac{u}{2}\bigg)+C$ Also, conider the fact that if you wanted to do this by pa...
5
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Help Please! : Newton's Method August 13th 2009, 06:59 PM #1 Help Please! : Newton's Method Hi! We're doing Newton's method and I'm SO LOST! Lecturer only gave one example. Can anyone help me with the following question so I can compare? Don't know where to start! Annotations through your workings would be gr...
4
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Predicates Help March 4th 2009, 09:31 AM M.A.T.H Predicates Help We have the predicates E and O describing integers, defined by E(n) is true if n is even, and O(n) is true if n is odd. (a) Express in predicate calculus notation the sentence the sum of two odd integers is even. Can any please pleas...
4
[ -0.027099609375, 0.11962890625, 0.06884765625, 0.07080078125, 0.10546875, 0.02880859375, 0.09130859375, -0.00099945068359375, 0.032958984375, -0.01220703125, 0.00848388671875, -0.04150390625, -0.026123046875, -0.025634765625, 0.0181884765625, 0.0301513671875, 0.0093994140625, -0.02...
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the encyclopedic entry of Percolation_theory In mathematics , percolation theory describes the behavior of connected clusters in a random graph . The applications of percolation theory to materials science and other domains are discussed in the article percolation . Introduction A representative question ...
4
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Null Steering in Failed Antenna Arrays Applied Computational Intelligence and Soft Computing Volume 2011 (2011), Article ID 692197, 9 pages http://dx.doi.org/10.1155/2011/692197 Research Article Null Steering in Failed Antenna Arrays Department of Electronics and Computer Engineering, Indian Institute of Technology ...
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[ -0.006622314453125, 0.057861328125, -0.0164794921875, -0.003631591796875, -0.006256103515625, -0.1015625, 0.0164794921875, -0.05029296875, -0.0859375, -0.0162353515625, -0.01043701171875, 0.0595703125, 0.10546875, -0.0308837890625, -0.04345703125, 0.05224609375, -0.06396484375, -0....
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Fuzzy Retractions of Fuzzy Open Flat Robertson-Walker Space Advances in Fuzzy Systems Volume 2013 (2013), Article ID 342805, 7 pages http://dx.doi.org/10.1155/2013/342805 Research Article Fuzzy Retractions of Fuzzy Open Flat Robertson-Walker Space ^1Mathematics Department, Faculty of Science, Taibah University, Madi...
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Continuity with product of the range April 4th 2009, 08:40 AM #1 Junior Member Joined Feb 2008 Posts 63 Continuity with product of the range Let $f_1: X \rightarrow Y_1$ and $f_2: X \rightarrow Y_2$ be continuous functions. Show that $h: X \rightarrow Y_1\times Y_2$ defined by $h(x)=(f_1(x),f_2(x))$, is ...
5
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Oscillatory Periodic Solutions for Two Differential-Difference Equations Arising in Applications Abstract and Applied Analysis Volume 2011 (2011), Article ID 635926, 12 pages http://dx.doi.org/10.1155/2011/635926 Research Article Oscillatory Periodic Solutions for Two Differential-Difference Equations Arising in Appl...
5
[ -0.1552734375, 0.03076171875, 0.0869140625, 0.07568359375, -0.0027008056640625, 0.01373291015625, -0.0189208984375, -0.017333984375, 0.01300048828125, -0.0625, 0.12353515625, -0.09765625, -0.00164031982421875, 0.00836181640625, 0.0498046875, -0.045166015625, -0.11376953125, -0.0388...
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1 equation 1 unknown but still killing my brain April 27th 2010, 07:01 PM #1 Newbie Joined Apr 2010 Posts 4 1 equation 1 unknown but still killing my brain hi all. i have the following equation and am not sure how to solve it. it seems so simple but i haven't done math in a while and am not sure the step...
4
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Points on horizontal tangent plane? March 12th 2011, 03:56 PM #1 Points on horizontal tangent plane? This is a question from my calculus 3 class. "Find all points on the surface at which the tangent plane is horizontal." z = x^2 - xy + y^2 - 2x + 4y Okay, so I'm not sure where to begin. I know that ...
4
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Sensitivity Studies for the Exercise I-1 of the OECD/UAM Benchmark Science and Technology of Nuclear Installations Volume 2012 (2012), Article ID 817185, 10 pages http://dx.doi.org/10.1155/2012/817185 Research Article Sensitivity Studies for the Exercise I-1 of the OECD/UAM Benchmark ^1San Piero a Grado Nuclear Rese...
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[ 0.00121307373046875, 0.0233154296875, 0.04638671875, 0.07080078125, -0.03466796875, -0.1123046875, -0.05322265625, 0.119140625, -0.0380859375, -0.006317138671875, 0.0023040771484375, -0.06494140625, 0.1171875, 0.01263427734375, -0.061279296875, 0.0113525390625, 0.0517578125, -0.052...
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Math Help Hello, Mr_Green! I agree with Plato . . . If $x \;=\;\sum^6_{i=2}\ln(3i-2)$ What is the value of $e^x$ ? We have: . $x \;=\;\ln(4) + \ln(7)+\ln(10)+\ln(13)+\ln(16) \:=\:\ln\left(4\!\cdot\!7\!\cdot\! 10\!\cdot\!13\!\ cdot\!16\right) \:=\;\ln(58,240)$ Therefore: . $e^x\;=\;e^{\ln58,240} \;=\;58,240$
4
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I need help with functions. February 24th 2009, 11:46 AM #1 Newbie Joined Feb 2009 Posts 3 I need help with functions. Can someone please help me solve these three problems: 1) Let f be the function defined by f(x) = 2x^4 + 5. Find f(a+h), f(2a-h). 2) Let f be the function defined by f(x) = -3x^...
4
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On Uniform Exponential Stability and Exact Admissibility of Discrete Semigroups International Journal of Differential Equations Volume 2013 (2013), Article ID 268309, 4 pages http://dx.doi.org/10.1155/2013/268309 Research Article On Uniform Exponential Stability and Exact Admissibility of Discrete Semigroups ^1Shahe...
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Minimum Distance October 18th 2009, 11:01 AM #1 Minimum Distance Can somebody tell me if I've started this off right? I need to use the Lagrange method to find the minimum distance from the point (1,2,3) to any point of the surface: $x + 2y - z = 2$ Let: $D^2=f(x,y,z)=(x-1)^2+(y-2)^2+(z-3)^2$ and ...
5
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Density-Wave Spiral Theories in the 1960s. II - I.I. Pasha 3.2. Group properties of tightly wrapped packets ...a shatteringly destructive article. ...
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About direct image of ideal sheaves up vote 3 down vote favorite Let $\mu:X'\rightarrow X$ be a birational morphism of normal complex projective varieties. Consider the two ideal sheaves $I_1= \mu_*\mathcal{O}_{X'}(-\sum d(E)E)$, $I_2=\mu_*\mathcal{O}_{X'}(-\sum(d(E)+1)E)$, where the $d(E)$'s are non negative integer...
5
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Taylor development April 29th 2011, 03:43 PM #1 Member Joined May 2010 Posts 241 Taylor development Hi there. I have this exercise which I'm trying to solve now. It says: Using that $\displaystyle\sum_{n=0}^{\infty}x^n=(1-x)^{-1}$ find one Taylor development for the function $f(x)=\ln(1-x)$ So,...
5
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Integral and Series Representations of Riemann's Zeta Function and Dirichlet's Eta Function and a Medley of Related Results Journal of Mathematics Volume 2013 (2013), Article ID 181724, 17 pages http://dx.doi.org/10.1155/2013/181724 Research Article Integral and Series Representations of Riemann's Zeta Function and D...
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Sign-Changing Solutions for Nonlinear Elliptic Problems Depending on Parameters International Journal of Differential Equations Volume 2010 (2010), Article ID 536236, 33 pages http://dx.doi.org/10.1155/2010/536236 Research Article Sign-Changing Solutions for Nonlinear Elliptic Problems Depending on Parameters ^1I...
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shortest chord November 10th 2010, 10:17 PM #1 Member Joined Mar 2008 From ??? Posts 169 shortest chord What normal to the curve y = x^2 forms the shortest chord? This is what I did: I used parametric form of parabola and did stuff, put it in distance formula.. d/dt = 0 it, I'm getting a com...
5
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Urgent help needed please!!! June 28th 2008, 12:11 AM #1 Newbie Joined Jun 2008 Posts 4 Scott is saving for an overseas holiday and he is looking for the best bank in which to invest his money. Three banks are offering different interest rates as follows: Bank Able: 8.1%(nominal p.a.) compounded mont...
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Eigenvalues August 29th 2011, 01:36 AM #1 Member Joined Jan 2011 Posts 110 Eigenvalues I am trying to determine the eigenvalues of A A = (6 0 2) (0 7 0) (2 0 3) Which is a 3x3 matrix. So far I have. The characteristic equation is det (A-lambda I)=0; |6-lam 0 2| |0 ...
5
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Infinite Sequences and Series November 13th 2008, 09:41 PM #1 Newbie Joined Sep 2008 Posts 7 Infinite Sequences and Series I have to determine whether the sequence converges or diverges and, if it does converge, find the limit. I'm confused about these two. arctan(2x) The limit of arctan(x) as ...
5
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Please help! May 18th 2006, 12:02 AM #1 Newbie Joined Mar 2006 Posts 17 Please help! I really need someone to help me understand this very clearly: A hemispherical bowl has an internal radius of 13 cm, and contains water to a maximum depth of 8 cm. Find the volume of water in the bowl. Show all work...
5
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Nonlinear Extension of Multiproduct Expansion Schemes and Applications to Rigid Bodies International Journal of Differential Equations Volume 2013 (2013), Article ID 681575, 10 pages http://dx.doi.org/10.1155/2013/681575 Research Article Nonlinear Extension of Multiproduct Expansion Schemes and Applications to Rigid ...
4
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IntroductionBackgroundCamera CalibrationMulti-Head Camera CalibrationMethodologyCamera Calibration with RO ConstraintsImage RectificationImage RegistrationImages FusionExperimental AssessmentConclusionsReferencesFigures and Tables Integrating medium format cameras to produce high-resolution multispectral images is a re...
4
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Quadratic Stark Effect Next: Degenerate Perturbation Theory Up: Time-Independent Perturbation Theory Previous: Non-Degenerate Perturbation Theory Quadratic Stark Effect Suppose that a one-electron atom [i.e., either a hydrogen atom, or an alkali metal atom (which possesses one valance electron orbiting outside ...
4
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[SOLVED] Find sum of infinite series? April 23rd 2009, 05:34 AM fardeen_gen [SOLVED] Find sum of infinite series? Find the sum of the following infinite series: ∑(n = 0 to ∞) (1/n![∑(k = 0 to n) ((k+1).∫(from 0 to 1) 2^(-(k +1)x) dx]8) April 25th 2009, 09:55 PM fardeen_gen Is it something to do with ...
5
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exponents and logs May 14th 2007, 04:48 PM turillian@gmail.com exponents and logs This type of question is kiiiiiling me right now. Solve for x. 2^(1-x) = 3 Solve for x. 3^(2x-1) = 5 EDIT: these two are similar ones I can't find a solid approach to. log base 2 of (log base 3 of (x)) = 4 ...
4
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Set - Distributive Law June 16th 2009, 04:15 AM #1 Member Joined Jun 2009 Posts 78 Set - Distributive Law I've came across an example... By using A-B=A n B', prove that (A u B)-(A n B)=[A-(A n B)] u [B-(A n B)] The solution they gave is... (A u B)-(A n B)=(A u B) n (A n B)' =[A n (A n ...
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Graph theory proof September 3rd 2013, 11:21 AM tarheelborn Graph theory proof Use ordinary induction on k or on the number of edges (one by one) to prove that a connected graph with 2k odd vertices composes into k trails if k > 0. Does this remain true without the connectedness hypothesis? So far, I ha...
4
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Convergence of sequence April 4th 2010, 11:07 AM #1 Newbie Joined Apr 2010 Posts 11 Convergence of sequence A) How do you prove that if 0(</=)x(</=)10, then 0(</=)sqrt(x+1)(</=)10? B) So once that is found, then how can you prove that if 0(</=)u(</=)v(</=)10, then 0(</=)sqrt(u+1)(</=)sqrt(v+1)(</=)1...
5
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Fixed point in rotations October 18th 2010, 06:07 AM #1 Fixed point in rotations Let $P,Q \in \mathbb{E}^2$ be distinct points, and $\alpha, \beta$ angles such that $\alpha+\beta eq 0, 2 \pi$. Let OPQO' be a quadrilateral such that $OPO'= \alpha$, $O'Qo= \beta$ are directed angles (both clockwise as interior...
5
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-Dimensional Mixed-Type Additive and Quadratic Functional Equation in Non-Archimedean Normed Spaces Abstract and Applied Analysis Volume 2012 (2012), Article ID 401762, 9 pages http://dx.doi.org/10.1155/2012/401762 Research Article Stability of the -Dimensional Mixed-Type Additive and Quadratic Functional Equation in...
5
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Matrix of a Nilpotent Operator Proof March 27th 2011, 02:40 PM Anthonny Matrix of a Nilpotent Operator Proof I'm trying to understand this one proof about the matrix of a nilpotent operator and I'm stuck on this one part. Here is the theorem I'm trying to prove and how the proof goes: Suppose N is a nilpote...
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Sample Size Growth with an Increasing Number of Comparisons Journal of Probability and Statistics Volume 2012 (2012), Article ID 935621, 10 pages http://dx.doi.org/10.1155/2012/935621 Research Article Sample Size Growth with an Increasing Number of Comparisons ^1Department of Medicine, UCLA School of Medicine, Los A...
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A few analysis questions December 28th 2008, 02:25 PM #1 A few analysis questions Hey everyone! Any input would be appreciated. A note on notation, $f\in\mathfrak{R}(\alpha)$ on $[a,b]$ means that $f$ is Riemann-Stieltjes integrable with respect to $\alpha(x)$ on the interval $[a,b]$ Question 1: Let $x_...
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Math Help April 13th 2008, 10:29 PM #1 Member Joined Feb 2008 Posts 79 Parity With my exam on Friday, I'm trying to get all these practice probs done since some of them will be on the exam. If $P$ is the Parity Operator, determine the parity of the functions below: $P\sin{x} = ?$ $Pe^{-x} ...
5
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trig equations December 5th 2012, 07:08 AM enea54 trig equations hi guys , i am a high school student , and i have a trigonometry test tomorrow . i would appreciate every help from you. for now i can't solve these trigonometry equations. they are mashing up my mind 1) sin^2x + sinx * cosx = 1 ...
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Compound Angle Identity March 6th 2010, 03:16 PM #1 Newbie Joined Jan 2010 Posts 21 Compound Angle Identity How would I prove these identities? 1) sin(A+B)*sin(A-B)=(sin A)^2*(sin B)^2 I've gotten to expanding it to (sin(A)cos(B)+sin(B)cos(A))*(sin(A)cos(B)-sin(B)cos(A)) then (sin(...
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The Kinematics Analysis of a Novel 3-DOF Cable-Driven Wind Tunnel Mechanism Journal of Robotics Volume 2010 (2010), Article ID 609391, 7 pages http://dx.doi.org/10.1155/2010/609391 Research Article The Kinematics Analysis of a Novel 3-DOF Cable-Driven Wind Tunnel Mechanism ^1College of Aerospace Engineering, NUAA,...
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Solve an equation system with three unknown variables February 27th 2011, 04:08 AM #1 Junior Member Joined Jan 2011 Posts 49 Solve an equation system with three unknown variables Please solve this equation system: xy+x+y=11 xz+x+z=14 yz+y+z=19 First I factorized everything: (x+1)(y+1...
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Direct Index Method of Beam Damage Location Detection Based on Difference Theory of Strain Modal Shapes and the Genetic Algorithms Application Mathematical Problems in Engineering Volume 2012 (2012), Article ID 302482, 12 pages http://dx.doi.org/10.1155/2012/302482 Research Article Direct Index Method of Beam Damage ...
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-Laplacian Integrodifferential Equations in Banach Spaces Abstract and Applied Analysis Volume 2013 (2013), Article ID 398632, 9 pages http://dx.doi.org/10.1155/2013/398632 Research Article A Class of Fractional -Laplacian Integrodifferential Equations in Banach Spaces ^1Guangxi Key Laboratory of Hybrid Computation ...
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Function Integrate-Qag ( integrate-qag < f > < a > < b > &key (key 0) (limit 100) (epsabs 0.0d0) (epsrel 1.d-5) ) Compute the integral of f(x) from a to b. b / [ I f(x) dx ] / a f - double precision function subprogam defining the integrand function f(x). the actual name for f needs to be a - double precision lo...
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[ -0.060791015625, 0.05224609375, -0.040771484375, -0.0634765625, -0.04443359375, -0.0712890625, 0.00909423828125, 0.061279296875, -0.0693359375, 0.0067138671875, 0.0216064453125, -0.0703125, 0.11767578125, -0.015380859375, -0.0291748046875, -0.0172119140625, -0.0157470703125, 0.0046...
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