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probability problem April 4th 2009, 07:35 AM #1 Super Member Joined Sep 2008 Posts 607 probability problem There are 16 competitors in a table-tennis competition, 5 of which come from Racknor Comprehensive School. Prizes are awarded to the competitors finishing in each of first, second and third ...
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Proving that two groups are isomorphic December 13th 2013, 09:59 AM #1 Member Joined Nov 2012 From israel Posts 164 Thanks 2 Proving that two groups are isomorphic Hi. I know that if I can show an isomorphism between two groups then that does it, but correct me if I'm wrong here (because real...
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Irrational numbers.Why ? April 16th 2011, 06:00 AM #1 Newbie Joined Mar 2011 Posts 8 Irrational numbers.Why ? Hi all, I would like to know why rational numbers can encompass numbers that are infinite but periodical ( like 1/3) and cannot comprise numbers that are infinite but non-periodical (like Pi...
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law of quadratic residue November 9th 2008, 09:22 AM #1 Junior Member Joined Sep 2008 Posts 46 law of quadratic residue let p and q be prime numbers with p=3 mod 4 and q=2p + 1. Prove that 2^p -1 is a Mersenne prime if and only if p=3. Since $p=4k+3$ it means $q=2(4k+3)+1 = 8k+7$ thus $q\equiv 7(\bm...
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Asymptotic Behavior of a Class of Degenerate Parabolic Equations Abstract and Applied Analysis Volume 2012 (2012), Article ID 673605, 15 pages http://dx.doi.org/10.1155/2012/673605 Research Article Asymptotic Behavior of a Class of Degenerate Parabolic Equations ^1School of Traffic and Transportation, Lanzhou Jiaoto...
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Modeling and Performance Analysis of Energy Efficiency Binary Power Control in MIMO-OFDM Wireless Communication Systems International Journal of Distributed Sensor Networks Volume 2011 (2011), Article ID 946258, 8 pages http://dx.doi.org/10.1155/2011/946258 Research Article Modeling and Performance Analysis of Energy...
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Gene Expression Network Reconstruction by The Scientific World Journal Volume 2012 (2012), Article ID 753430, 6 pages http://dx.doi.org/10.1100/2012/753430 Research Article Gene Expression Network Reconstruction by LEP Method Using Microarray Data School of Mathematics & Computational Science, Sun Yat-Sen Universit...
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Solving an equasion Implicitly, Hydraulics Question January 21st 2013, 10:53 AM #1 Newbie Joined Jan 2013 From St. Johns Posts 1 Solving an equasion Implicitly, Hydraulics Question Ok, so I am trying to solve this equasion for y 0.33392=(1/0.027)*(y+2*y^2)*((y+2*y^2)/(2.236+4.472*y))^(2/3) ...
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Closed Under Addition Proofs October 29th 2008, 08:25 PM kathrynmath Closed Under Addition Proofs I'm trying to prove x is a real number is closed under addition and 3Z is closed under addition, where Z is the set of integers. October 29th 2008, 08:34 PM vagabond To prove 3Z is closed under addition, we n...
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Demonstration using congruency modulo m December 13th 2011, 12:50 AM #1 Newbie Joined Dec 2011 Posts 3 Demonstration using congruency modulo m Well, i am stuck with a problem. I have to prove that 7|(3^(2n+1) + 2^(n+2)) using the modulo m congruency. Well this will mean that 3^(2n+1) + 2(n+2) mod 7 ...
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Prime Ideal Integral domain May 18th 2009, 07:37 PM #1 Newbie Joined May 2009 Posts 16 Prime Ideal Integral domain Let R be a commutative ring with unity. Show that the ideal generated by <x>={xf(x)|f(x) is a polynomial in R[x]} is a prime ideal in R[x] if and only if R is an integral domain. For th...
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Factorising Polynomial over the real number field May 17th 2011, 05:35 PM aonin Factorising Polynomial over the real number field hey guys I was just wondering whether I'm doing this right for example the question asks to factor $z^6+8$ over the real number field Heres what I did $z^6+8=(z^2)^3+2^3$...
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find the equation February 22nd 2010, 10:30 PM #1 Newbie Joined Feb 2010 Posts 22 find the equation Find the equation of the parabola with vertex: (0,0); axis: x axis; length of latus rectum: 5. Please help me and show the solution... Or just give me an idea on how to answer this question... Thanks!...
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Effective Thermal Conductivity of Open Cell Polyurethane Foam Based on the Fractal Theory Advances in Materials Science and Engineering Volume 2013 (2013), Article ID 125267, 7 pages http://dx.doi.org/10.1155/2013/125267 Research Article Effective Thermal Conductivity of Open Cell Polyurethane Foam Based on the Fract...
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Ground State Solutions for the Periodic Discrete Nonlinear Schrödinger Equations with Superlinear Nonlinearities Abstract and Applied Analysis Volume 2013 (2013), Article ID 317139, 11 pages http://dx.doi.org/10.1155/2013/317139 Research Article Ground State Solutions for the Periodic Discrete Nonlinear Schrödinger E...
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calculate moments of inertia October 8th 2010, 05:44 PM tsang calculate moments of inertia Hi everyone,I got a question here and I thought I have solved it,and I've double checked my answer again and again,but I still get different answer compare to solution.I really feel solution is wrong,can anyone help me...
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Calculating taxable income February 3rd 2010, 07:31 PM #1 Junior Member Joined Jan 2010 Posts 40 Calculating taxable income I just finished working out this problem and I'm not very sure if I did it correctly For a) The formula I wrote out is f(x) = 0.0685(x) + 973 which would give me a taxable inco...
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Part B: The Pension Obligation and Plan Assets Chapter17: Pensions and Other Postretirement Benefits Part B: The Pension Obligation and Plan Assets The Pension Obligation Now we consider more precisely what is meant by the pension obligation. Unfortunately, there's not just one definition, nor is there uniformity co...
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Math Help June 3rd 2009, 10:35 AM #1 Super Member Joined Jun 2008 Posts 829 Flux $F(x,y,z) = xze^y i - xze^y j + z k$ S is part of the plan $x+y+z=1$ in first octante with orientation to down by divergence theorem $F(x,y,z) = xze^y i - xze^y j + z k$ $\int\int F.n ds=\int\int\int divF...
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An integration problem in Fourier transform inversion Calculate $\frac{1}{\sqrt{2\pi}} \int^\infty_{-\infty} \frac{e^{-ikx}}{1 + k^2} dk$. How should I start? You should start considering that is... $\int_{- \infty}^{+\infty} \frac{e^{-j k x}}{1+k^{2}}\ dk = \int_{- \infty}^{+\infty} \frac{e^{j k x}}{1+k^{2}}\ dk$ (1)...
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integral thought process? February 21st 2009, 12:15 PM #1 Member Joined Feb 2009 Posts 125 integral thought process? what should my thought process be when evaluating this integtral, where I have a fairly large x in front of a third root? Where do I start? $\int x^{11}\sqrt[3]{2x^4+5}$ Think a ...
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Second-Order Multiagent Systems with Event-Driven Consensus Control Abstract and Applied Analysis Volume 2013 (2013), Article ID 250586, 9 pages http://dx.doi.org/10.1155/2013/250586 Research Article Second-Order Multiagent Systems with Event-Driven Consensus Control School of Automation Engineering, University of E...
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ter Chapter 16 - The Methods of Mashing 16.3 Calculations for Boiling Water Additions These calculations allow you to estimate the amount of heat provided by a volume of hot water so you can predict how much that heat will change the temperature of the mash. This method makes a few simplifications, one of which is t...
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Maximizing Submodular Functions (Part 2) March 26, 2012 Continuing on my last post, today I will talk about recent work by Niv Buchbinder, Moran Feldman, Seffi Naor, and Roy Schwartz that gives a simple 1/2 approximation to the (unconstrained) submodular maximization problem, matching the hardness. Do see the paper (...
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integrating sine functions October 20th 2008, 05:13 AM #1 Junior Member Joined May 2008 Posts 25 integrating sine functions Posted, it here as the homework has no help was given in the other thread, and it has become a matter which quite urgently must be solved. I am to determine the area between th...
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Exact Stiffness for Beams on Kerr-Type Foundation: The Virtual Force Approach Journal of Applied Mathematics Volume 2013 (2013), Article ID 626287, 13 pages http://dx.doi.org/10.1155/2013/626287 Research Article Exact Stiffness for Beams on Kerr-Type Foundation: The Virtual Force Approach ^1Department of Civil Engin...
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Localization Algorithm Based on Maximum a Posteriori in Wireless Sensor Networks International Journal of Distributed Sensor Networks Volume 2012 (2012), Article ID 260302, 7 pages http://dx.doi.org/10.1155/2012/260302 Research Article Localization Algorithm Based on Maximum a Posteriori in Wireless Sensor Networks ...
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the encyclopedic entry of constant integration This article is about the harmonic oscillator in classical mechanics. For its use in quantum mechanics, see quantum harmonic oscillator. In classical mechanics, a harmonic oscillator is a system which, when displaced from its equilibrium position, experiences a restor...
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volume of sphere using disk method. March 9th 2009, 03:43 PM #1 Member Joined Feb 2009 Posts 125 volume of sphere using disk method. Say I have a sphere and it has a radius of 3. How could I find it's volume using the disk method and integration? By disk method I assume you mean using cylindrical co...
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Homework Help Posted by beckii on Monday, November 5, 2007 at 6:38pm. i am having serious optimization problems. i don't get it!!! plz help. a 216-m^2 rectangular pea patch is to be enclosed by a fence and divided into two equal parts by another fence parallel to one of the sides. what dimensions for the outer rectan...
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fast sine function A couple of days ago I tried to self study the mathematical explanation of pi (π) and ended up with very interesting results and ideas First of all lets answer the classic question; What is pi? Pi or π is a mathematical constant whose value is the ratio of any circle‘s circumference to its diameter...
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Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect ISRN Mechanical Engineering Volume 2014 (2014), Article ID 349020, 7 pages http://dx.doi.org/10.1155/2014/349020 Research Article Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effec...
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Homework Help Posted by Bryan on Friday, November 30, 2007 at 6:38pm. Solve the given equation in the interval [0,2 pi]. Note: The answer must be written as a multiple of pi. Give exact answers. Do not use decimal numbers. The answer must an integer or a fraction. Note that pi is already provided with the answer s...
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[SOLVED] Stumped - Help get me started April 25th 2009, 04:19 PM #1 Junior Member Joined Apr 2009 Posts 70 [SOLVED] Stumped - Help get me started Ok, so I have the following to prove: If a and b are real numbers s.t. 0<a<b, then there is a natural number n s.t. a<b-1/n<b. I am confused as to wh...
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Questions and Problems Chapter7: Making Capital Investment Decisions Questions and Problems p. 196 1. Incremental Cash Flows Which of the following should be treated as an incremental cash flow when computing the NPV of an investment? a. A reduction in the sales of a company s other products caused by the...
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Calculating variance of u_n - u_2n July 7th 2008, 07:19 PM #1 Member Joined Jun 2008 Posts 148 Calculating variance of u_n - u_2n Let u_n = (sum_(k=1,n) X_k)/n where X_i is an numerical observation of a random variable with density function f. Similarily let u_2n = (sum_(k=1,2n) X_k)/2n where again...
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-Jordan Homomorphisms from a Normed Algebra to a Banach Algebra Abstract and Applied Analysis Volume 2013 (2013), Article ID 691025, 5 pages http://dx.doi.org/10.1155/2013/691025 Research Article Stability of -Jordan Homomorphisms from a Normed Algebra to a Banach Algebra Department of Mathematics Education, Gongju ...
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The modern NFL: are completions and yardage truly independent variables? It’s a simple function of algebra, that two variables, related by a constant, are really only one independent parameter. Mixing the two variables in the formula really means only one is actually important, and if you add this kind of misbuilt form...
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Solving an inequality March 29th 2011, 06:50 AM bobb12 Solving an inequality Function $f: R \rightarrow R$ is a periodic function with period $T=6$. For $x \in <-3,3>$, the formula of this function is $f(x)=9-x^2$. Solve the inequality $f(x) \le 5$. March 29th 2011, 07:06 AM TheEmptySet Quote: Note ...
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Solid of revolution January 27th 2010, 05:08 AM #1 Member Joined Jan 2010 Posts 104 Solid of revolution We have a raindrop that is obtained by revolving the profile curve: f(x)=sqrt(x)*(x-C)^2 about the x-axis for 0<=x<=C, with C a positive constant. a) Sketch the profile curve and solid of rev...
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[SOLVED] Showing that an expression is divisible by 7 June 12th 2009, 11:23 PM #1 Member Joined May 2009 Posts 99 [SOLVED] Showing that an expression is divisible by 7 Show that $2^n + 2^{n+1} + 2^{n+2}$ is divisible by 7 where n is a positive integer. How do I do this question? I solved it by just showi...
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Some New Algebraic and Topological Properties of the Minkowski Inverse in the Minkowski Space The Scientific World Journal Volume 2013 (2013), Article ID 765732, 6 pages http://dx.doi.org/10.1155/2013/765732 Research Article Some New Algebraic and Topological Properties of the Minkowski Inverse in the Minkowski Space...
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Multifractal Structure of the Divergence Points of Some Homogeneous Moran Measures Advances in Mathematical Physics Volume 2014 (2014), Article ID 161756, 8 pages http://dx.doi.org/10.1155/2014/161756 Research Article Multifractal Structure of the Divergence Points of Some Homogeneous Moran Measures Wuhan College, Z...
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gauss jordan elimination February 24th 2009, 09:49 AM #1 Member Joined Dec 2008 Posts 86 gauss jordan elimination Hello i need help to solve this: Use gauss jordan elimination to solve for x' and y' in terms of x and y the matrix is: cos(theta) -sin(theta) x sin(theta) cos(theta) y ...
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CAGR and Why are Square Roots Taken? August 14th 2010, 03:59 AM #1 Newbie Joined Aug 2010 Posts 3 CAGR and Why are Square Roots Taken? Hi, I am working on a couple of calucalations for a colleague that wants to arrive at a Compounded Annual Growth Rate (CAGR) for a time-series of investment data: ...
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Math Help May 31st 2010, 02:11 PM #1 Member Joined Apr 2010 Posts 135 integrating hello i was asked to from a list a multiple choice which answer when inegrated gives the result $x - lnx^2$ to get that answer i differentiated the function to get the answer which was $x-2/x$ i am now trying to i...
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Question involving linear operators, matrices, and compositions October 12th 2010, 09:55 AM Runty Question involving linear operators, matrices, and compositions Upcoming midterms are giving me very little time to work on assignments such as this one, so I need help with this. Suppose $V$ is a vector space ...
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Using Pascal's Triangle to Solve a sqrt Binomial May 22nd 2010, 01:47 PM #1 Newbie Joined May 2010 From Gallifrey Posts 1 Using Pascal's Triangle to Solve a sqrt Binomial I need an answer to these expressions using the Pascal method... I was doing very well on my work until I ran into these two quest...
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If x/y =2/3, then (x-y)/x? Author Message TAGS: If x/y =2/3, then (x-y)/x? [#permalink] 21 Oct 2005, 00:42 1 Th...
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-Dimensional Framework for Medial-Based Image Segmentation International Journal of Biomedical Imaging Volume 2010 (2010), Article ID 980872, 12 pages http://dx.doi.org/10.1155/2010/980872 Research Article Shells and Spheres: An -Dimensional Framework for Medial-Based Image Segmentation ^1749 Benedum Hall, Universit...
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)-Contractive Mappings via Generalized Altering Distance Function and Related Fixed Point Theorems Abstract and Applied Analysis Volume 2014 (2014), Article ID 259768, 12 pages http://dx.doi.org/10.1155/2014/259768 Research Article Discussion on Generalized-(αψ, β)-Contractive Mappings via Generalized Altering Distan...
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Integral. February 22nd 2010, 05:14 AM Ted Integral. Hello. evaluate: $\int \sqrt{x^2+16} dx$. Without using Trig/Hyperbolic Substitutions. And you must use the substitution method only. I believed, its impossible to solve it. February 22nd 2010, 07:28 AM lil_cookie The way I was taug...
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Homework Help Posted by kchik on Tuesday, December 11, 2012 at 12:54pm. The region A is bounded by the curve y=x^2-5x+6 and the line y = -x + 3. (a) Sketch the line and the curve on the same set of axes. (b) Find the area of A. (c) The part of A above the x-axis is rotated through 360degree about the x-axis. Find t...
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Finding a point on a line closest to a given point October 5th 2007, 07:44 PM #1 Junior Member Joined Sep 2007 Posts 31 Finding a point on a line closest to a given point Find the point on the line 4 x + 5 y + 6 =0 which is closest to the point ( 4, 3 ). can anyone solve this so i can see how it is ...
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General Family of Third Order Methods for Multiple Roots of Nonlinear Equations and Basin Attractors for Various Methods Advances in Numerical Analysis Volume 2014 (2014), Article ID 963878, 8 pages http://dx.doi.org/10.1155/2014/963878 Research Article General Family of Third Order Methods for Multiple Roots of Nonl...
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Iterative Learning Control for Remote Control Systems with Communication Delay and Data Dropout Mathematical Problems in Engineering Volume 2012 (2012), Article ID 705474, 14 pages http://dx.doi.org/10.1155/2012/705474 Research Article Iterative Learning Control for Remote Control Systems with Communication Delay and...
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Hypothesis test July 25th 2006, 08:00 AM #1 Newbie Joined Jun 2006 Posts 12 Hypothesis test After running about 17 miles, marathon runners encounter a form of physiological stress which they call "hitting the wall". To better pinpoint where in the race to expect this phenomenon, a sports physiologist...
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If 3x + 5 < x + 11, is x prime? Author Message TAGS: If 3x + 5 < x + 11, is x prime? [#permalink] 19 Jan 2013, 20:32 4 ...
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Improved Polynomial Fuzzy Modeling and Controller with Stability Analysis for Nonlinear Dynamical Systems Mathematical Problems in Engineering Volume 2012 (2012), Article ID 273631, 21 pages http://dx.doi.org/10.1155/2012/273631 Research Article Improved Polynomial Fuzzy Modeling and Controller with Stability Analysi...
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right and left cosets December 15th 2008, 06:27 AM #1 Member Joined Feb 2008 Posts 125 right and left cosets I am suppose to find the right and left cosets of <(1 2 3),2> in S_3 (+) Z_3 (+) is the External Direct Product sign I know that 0 1 2 make up Z_3 and I think S_3 is 1 2 3 Then ...
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A simple identity to verify January 25th 2010, 08:18 AM #1 Newbie Joined Oct 2009 Posts 21 A simple identity to verify Hello, I am having a hard time with this problem (picture attached). I always have difficulty with proof-like problems such as this one. I guess I just don't really have the mathema...
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Fixing non positive definite correlation matrices using R October 14, 2012 By a modeler's tribulations, gopi goteti's web log Problem When a correlation or covariance matrix is not positive definite (i.e., in instances when some or all eigenvalues are negative), a cholesky decomposition cannot be performed. Sometim...
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Second Order Differential Equation December 11th 2008, 05:11 PM #1 Newbie Joined Dec 2008 Posts 11 Hi, I need some help with a question involving differential equation. The first one is: Find the solution to the differential equation. y"-9y'+8y = 0, y(0) = 8, y'(0) = 8 Express your answ...
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Seven Cubes Solution Let n be a positive integer. Define the function f from Z^n to Z by f(x) = x_1+2x_2+3x_3+...+nx_n. For x in Z^n, say y is a neighbor of x if y and x differ by one in exactly one coordinate. Let S(x) be the set consisting of x and its 2n neighbors. It is easy to check that the values of f(y) for y i...
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Fourier Series and Mean Error April 28th 2010, 04:53 PM #1 Fourier Series and Mean Error Suppose the function f(x) is defined on the interval (-L,L) and $\int_{-L}^L f^2(x)~dx$ is finite. We want to approximate f(x) by a finite series of (co-)sines: $f(x) \approx g_N(x) = A_0 + \sum_{n=1}^N A_n\cos{\lef...
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Effect on beta one by changing x variables May 15th 2011, 01:58 AM #1 Newbie Joined Feb 2009 Posts 19 Effect on beta one by changing x variables Hi, please help me with this proof, I had to do a linear regression of y on x, where the x variables are 1851 to 1900 inclusive. I was asked to ch...
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Converegence and divergence of integrals. October 26th 2010, 06:17 PM #1 Newbie Joined Oct 2010 Posts 4 Converegence and divergence of integrals. i have no idea to solve these problems. Can anyone give me the solutions? Thank you very much!!! Explain why the following integrals are improper and dete...
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[ -0.00909423828125, -0.0400390625, 0.025390625, -0.08642578125, 0.00103759765625, -0.060302734375, 0.0037078857421875, 0.0233154296875, 0.01708984375, 0.01123046875, 0.0361328125, -0.032470703125, -0.0242919921875, -0.001983642578125, -0.0869140625, -0.00164794921875, 0.019287109375, ...
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Math Help January 13th 2010, 05:35 AM #1 Member Joined Sep 2009 Posts 98 vectors The points A, B and C have position vectors a = ( 2, 1, 2) b= (-3, 2, 5) c= ( 4, 5, -2) respectively with respect to a fixed origin. The point D is such that ABCD, in that order is a parallelogram. a) Find the posi...
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Basic Vector Recipes \( \newcommand{\bv}[1]{{\bf #1}} \) \( \newcommand{\bperp}{{\bf perp}} \) \( \newcommand{\bproj}{{\bf proj}} \) In a previous article I introduced basic vector concepts. In this article, I show how apply the theory to common geometric problems. About the Implementations The implementations give...
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[ -0.08056640625, -0.025634765625, -0.034423828125, -0.1279296875, -0.0301513671875, -0.033203125, -0.0126953125, 0.0498046875, -0.0537109375, 0.037109375, -0.039794921875, -0.0025634765625, -0.02587890625, 0.03564453125, 0.03271484375, 0.008056640625, -0.01220703125, 0.08056640625, ...
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Latin squares design in R January 6, 2010 By Todos Logos The Latin square design is used where the researcher desires to control the variation in an experiment that is related to rows and columns in the field. Remember that: * Treatments are assigned at random within rows and columns, with each treatment once per ...
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[ 0.01177978515625, 0.00994873046875, -0.041748046875, 0.00738525390625, -0.0400390625, 0.0439453125, -0.0751953125, 0.006561279296875, 0.06640625, 0.0498046875, -0.01202392578125, 0.05126953125, 0.029296875, -0.006591796875, -0.05908203125, 0.01556396484375, 0.0189208984375, 0.03979...
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Riemannian metrics and connections Riemannian metrics and connections October 27, 2009 Posted by Akhil Mathew in differential geometry. Tags: Christoffel symbols, connections, Riemannian metrics trackback Wow.  Blogging is definitely way harder during the academic year.  Ok, so I’m aiming to change things around a b...
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[ -0.053466796875, -0.07470703125, 0.03173828125, -0.0478515625, -0.058349609375, 0.0164794921875, 0.040771484375, 0.030029296875, 0.051025390625, -0.07666015625, 0.06396484375, 0.017333984375, -0.05712890625, 0.0322265625, 0.0087890625, 0.01025390625, -0.006500244140625, 0.095703125...
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Machine Learning Ex3 – Multivariate Linear Regression March 29, 2011 By ygc Part 1. Finding alpha. The first question to resolve in Exercise 3 is to pick a good learning rate alpha. This require making an initial selection, running gradient descent and observing the cost function. I test alpha range from 0.01 to 1...
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[ -0.0206298828125, -0.08447265625, -0.06884765625, -0.058837890625, 0.10986328125, -0.0203857421875, -0.002838134765625, -0.052490234375, -0.049072265625, 0.0289306640625, 0.004791259765625, -0.00872802734375, -0.031005859375, 0.0028228759765625, -0.0198974609375, 0.038330078125, -0.0...
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Using Time Deformation to Filter Nonstationary Time Series with Multiple Time-Frequency Structures Journal of Probability and Statistics Volume 2013 (2013), Article ID 569597, 15 pages http://dx.doi.org/10.1155/2013/569597 Research Article Using Time Deformation to Filter Nonstationary Time Series with Multiple Time-...
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When Is the Complement of the Zero-Divisor Graph of a Commutative Ring Complemented? ISRN Algebra VolumeΒ 2012Β (2012), Article IDΒ 282054, 13 pages http://dx.doi.org/10.5402/2012/282054 Research Article When Is the Complement of the Zero-Divisor Graph of a Commutative Ring Complemented? Department of Mathematics, S...
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[ -0.037841796875, 0.09619140625, -0.0062255859375, 0.012939453125, 0.0732421875, -0.07275390625, 0.07373046875, 0.05419921875, 0.02099609375, -0.03466796875, 0.0299072265625, -0.0595703125, 0.0537109375, -0.040771484375, 0.0098876953125, 0.02490234375, -0.004425048828125, 0.00656127...
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T-Cell Model Derived from Nonstandard Numerical Scheme Journal of Applied Mathematics Volume 2013 (2013), Article ID 375094, 9 pages http://dx.doi.org/10.1155/2013/375094 Research Article A Numerical Comparison for a Discrete HIV Infection of CD4^+ T-Cell Model Derived from Nonstandard Numerical Scheme ^1Department...
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Green's function May 16th 2011, 07:13 PM #1 Junior Member Joined Oct 2008 Posts 70 Green's function green's functions are new to me so i'm struggling with these how does one use green's method to solve: -(K(x)u')'=f(x), 0<x<1; u(0)=u(1)=0; K(x)>0 thank you To find a green's function f...
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[ -0.06494140625, 0.0673828125, 0.10302734375, -0.036865234375, -0.024658203125, 0.03271484375, 0.0390625, -0.0205078125, -0.0279541015625, 0.01531982421875, 0.0003719329833984375, -0.0673828125, 0.025390625, -0.0380859375, -0.0020751953125, 0.0040283203125, -0.033203125, -0.01263427...
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Exponential/Log Function help January 23rd 2008, 06:10 AM #1 Junior Member Joined Jan 2008 Posts 50 Exponential/Log Function help I Can't seem to figure out how to show the work for this question For a biology experiment, there are 50 cells present. After 2 hours there are 1600 bacteria. How many ba...
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[ -0.0308837890625, 0.046875, -0.038330078125, 0.017333984375, -0.0703125, -0.0260009765625, -0.010009765625, 0.03759765625, 0.04833984375, 0.0986328125, 0.07177734375, -0.0966796875, 0.02392578125, 0.0625, -0.00262451171875, 0.024658203125, -0.0966796875, -0.041015625, -0.07617187...
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simple diff quesstion February 17th 2010, 03:38 AM #1 simple diff quesstion want to check a question and solution. differentiate with respect to x $y= (x^3+4)/x$ = $x^2+4x^-{^1}$ ( this is the line im confused about why does the x^3 become x^2 and not 3x) or is it wrong. $dy/dx = 2x-4x^{-...
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Can anyone provide a very hand-wavy, intuitive explanation of Heegaard Floer Homology? • /r/puremathematics all 8 comments [–]mian2zi314 points15 points16 points sorry, this has been archived and can no longer be voted on OK, here are some rough ideas: Say you have an even dimensional manifold M^n and a pair of sub...
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A Start-Up Demonstration Test Involving Distant Failures Journal of Quality and Reliability Engineering Volume 2013 (2013), Article ID 469546, 6 pages http://dx.doi.org/10.1155/2013/469546 Research Article A Start-Up Demonstration Test Involving Distant Failures SCE College of Engineering, Jabotinsky 84, Ashdod, Isr...
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interval of convergence help April 6th 2011, 11:36 AM #1 Newbie Joined Feb 2011 Posts 12 interval of convergence help f(x) = 2 / x+3 taylor series polynomial out to the 6th degree (P6) = (5/8) - (1/8)x + (1/32)(x-1)² - (1/128)(x-1)^3 + (1/512)(x-1)^4 - (1/2048)(x-1)^5 Problem: find the...
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Wordy question, about rate of temperature increase. April 25th 2010, 12:46 PM George321 Wordy question, about rate of temperature increase. A tank contains water which is heated by an electric water heater working under the the action of a thermostat. The temperature of the water, $\theta degrees C$, may be mode...
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Homework Help Posted by Heather on Saturday, March 24, 2012 at 12:09am. I need to calculate the voltage through the resistor and the voltage through the inductor of an RL series circuit for different frequencies. The voltage of the source is 2.5 V. The inductor is at the top and has an inductance of .200 H and the res...
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[ -0.05908203125, 0.134765625, -0.043701171875, 0.0205078125, 0.0194091796875, -0.01434326171875, -0.041015625, 0.0263671875, -0.0184326171875, -0.0498046875, -0.006622314453125, -0.048583984375, 0.05859375, 0.03369140625, 0.0079345703125, 0.042724609375, -0.0205078125, 0.10791015625...
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Fuzzy Sliding Mode Controller Design Using Takagi-Sugeno Modelled Nonlinear Systems Mathematical Problems in Engineering Volume 2013 (2013), Article ID 734094, 7 pages http://dx.doi.org/10.1155/2013/734094 Research Article Fuzzy Sliding Mode Controller Design Using Takagi-Sugeno Modelled Nonlinear Systems ^1Laborato...
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Sigma notation & Pascal's Triangle/Binomial Theorem. May 17th 2007, 04:08 PM Mulya66 Sigma notation & Pascal's Triangle/Binomial Theorem. I have no idea how to do these: A) "Find the sum of the arithmetic series" http://www.freewebs.com/smaii/sigma.bmp B) "Expand (x+2)^4" So far, all I could...
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An Inductive Link-Based Wireless Power Transfer System for Biomedical Applications Active and Passive Electronic Components Volume 2012 (2012), Article ID 879294, 11 pages http://dx.doi.org/10.1155/2012/879294 Research Article An Inductive Link-Based Wireless Power Transfer System for Biomedical Applications ^1Depar...
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Bifurcations of a Ratio-Dependent Holling-Tanner System with Refuge and Constant Harvesting Abstract and Applied Analysis Volume 2013 (2013), Article ID 478315, 10 pages http://dx.doi.org/10.1155/2013/478315 Research Article Bifurcations of a Ratio-Dependent Holling-Tanner System with Refuge and Constant Harvesting ...
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Quadratic and other polynomials Use the quadratic to solve for x: x-1 = 2x+1 2-x Please show all working out, thanks. Which part are you having trouble with? First you need to rearrange the equation into the form $ax^2+bx+c=0$ so you have: $\frac{x-1}{2-x}=2x+1$ $x-1=\left ( 2x+1\right )\left ( 2-x\right )$ $x-1= 4x-2...
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Could someone explain how to answer these 2 multiple integration questions please June 1st 2008, 05:09 PM #1 Newbie Joined Jun 2008 From China Posts 1 Could someone explain how to answer these 2 multiple integration questions please Hi, could someone explain step by step how to answer these questions...
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Equilateral Triangle July 31st 2009, 11:06 PM #1 Senior Member Joined Jul 2009 From Melbourne Posts 272 Thanks 4 Equilateral Triangle PQR is an equilateral triangle. The point U is the mid-point of PR. Points T and S divide QP and QR in the ratio 1:2. The point of intersection of PS, RT and QU is...
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Polar to cartesian December 1st 2011, 12:00 PM #1 Newbie Joined Jan 2011 Posts 23 Polar to cartesian Find the cartesian equation of $r^2 = 9\csc(20)$? choices: A. xy = 9 B. 3xy = 9 C. 2xy = 9 D. 4xy = 9 This is what ive done $(r^2= \frac{9}{\sin(20)}) \frac{1}{r}$ $\sqr...
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How to prove x > ln(x) For all x>0? How would I prove this? $x > ln(x) \forall x>0$ Consider the real-valued function $f(x) = x - \ln x$. Note that $f(x)$ is continuous on $(0, \infty)$ Since $\ln x < 0$ for $x \in (0,1)$, we have that $f(x) > 0$ on $(0,1)$. When $x = 1$, $f(x) = 1> 0$ also. Now we consider $x > 1$. N...
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Norms and Cauchy Sequences November 24th 2008, 07:49 PM #1 Senior Member Joined Nov 2008 Posts 461 Norms and Cauchy Sequences Hi! Two norms $||\bullet ||$ and $|||\bullet |||$ on a vector space V are called equivalent if there exist 0 < a <= b such that $a ||\bullet || \le |||\bullet ||| \le b ...
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Negative Binomial July 20th 2009, 11:51 AM #1 Newbie Joined Mar 2009 Posts 17 Negative Binomial Ok, so when I try solved the attached problem I don't know how to come up with the right answer which is : 0.55858 My way of solving the problem is the following: x=50 to infinity = 499(0.003)^2 (0....
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Integrals and Indefinite Integrals 1) Evaluate the integral: $\int^5_4(y-2)(2y+3) = \int^5_42y^2-y-6$ Antiderivative of the fucntion is f(x) = $\frac{2y^3}{3} - \frac{y^2}{2}-6y$ So the answer is f(5)-f(4) = 40.8333-22.6666. Have a feeling I messed up on this one. 2) Evaluate the Integral $\int^...
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Heisenberg Model with Added Dzyaloshinskii-Moria Interaction ISRN Condensed Matter Physics Volume 2011 (2011), Article ID 980192, 6 pages http://dx.doi.org/10.5402/2011/980192 Research Article Heisenberg Model with Added Dzyaloshinskii-Moria Interaction ^1Department of Physics, Science and Research Branch, Islamic A...
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Marginal Revenue February 2nd 2008, 06:48 PM #1 Member Joined Jan 2008 Posts 76 Marginal Revenue I need to find the marginal profit as tied into this equation R=2x(900+32x-x^2) with Marginal Revenue = $\frac{dP}{dx}$ a.) Additional revenue for x=14 to x=15 b.) Marginal revenue when X=...
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Is this the correct...? October 23rd 2008, 06:26 AM #1 Is this the correct...? Is this the correct cayley table for the units of integers mod 21? how would you find the order of each element? What ye did looks correct. To find the order of, say $[5]_{21}$ you need to take exponents until you rea...
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the encyclopedic entry of Minkowski world In physics, the Lorentz transformation converts between two different observers' measurements of space and time, where one observer is in constant motion with respect to the other. In classical physics (Galilean relativity), the only conversion believed necessary was x′ = x − v...
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Preliminary Orbit Determination of Artificial Satellites: A Vectorial Sixth-Order Approach Abstract and Applied Analysis Volume 2013 (2013), Article ID 960582, 10 pages http://dx.doi.org/10.1155/2013/960582 Research Article Preliminary Orbit Determination of Artificial Satellites: A Vectorial Sixth-Order Approach In...
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