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find the 1991st term January 13th 2011, 06:37 PM chris86 find the 1991st term Let 2,3,5,6,7,10,11,... be an increasing sequence of positive integers that are neither the perfect squares nor the cubes. Find the 1991st term. January 13th 2011, 06:57 PM chiph588@ Quote: Let's define $f(n)$ to be the nu...
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Gauss Lemma (Number Theory) November 2nd 2008, 10:55 PM #1 Newbie Joined Nov 2008 Posts 5 Gauss Lemma (Number Theory) Use Gauss Lemma (Number theory) to calculate the Legendre Symbol $(\frac{6}{13})$. I know how to use Gauss Lemma. However we use the book: Ireland and Rosen. They define Gauss Lemma ...
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help with proof December 1st 2009, 04:13 PM #1 Member Joined Jan 2008 Posts 175 help with proof Prove the following: An accumulation point of a set S is either an interior point of S or a boundary point of S. This seems very logical to me, I just dont know how to prove it. I know that an a...
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Brevet US6922452 - Method and apparatus for estimating Doppler spread FIELD OF THE INVENTION The present invention relates to mobile radio communications, and more particularly, to estimating Doppler spread in a mobile radio communications system. BACKGROUND AND SUMMARY OF THE INVENTION In mobile radio communication...
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On Uncertainty Principle for Quaternionic Linear Canonical Transform Abstract and Applied Analysis Volume 2013 (2013), Article ID 725952, 14 pages http://dx.doi.org/10.1155/2013/725952 Research Article On Uncertainty Principle for Quaternionic Linear Canonical Transform ^1Department of Mathematics, Faculty of Scienc...
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Patent US8144827 - Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver FIELD OF THE INVENTION The invention relates to a method for determining a residual frequency offset, a communication system, a metho...
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indefinite integral Can anyone please help to find an antiderivative of this function and the method used? (Please see attatchment) Cheers, Use trigonometric substitution. Let $x = 3\tan{\theta}$ so that $dx = 3\sec^2{\theta}\,d\theta$. Also note that $\theta = \arctan{\frac{x}{3}}$. So the integral becomes: $\int{\fr...
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Math Help December 12th 2009, 05:02 AM #1 Member Joined Sep 2006 Posts 134 Ratio We had this in a quiz, my answer was $\sqrt{2} = 1$ but my friends say the answer is 2 = 1 because they squared both sides. but I don't get why the need to square it. so here's the problem. A square is inscribed i...
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Equivalent Norms June 21st 2009, 02:00 PM #1 Junior Member Joined Apr 2009 Posts 39 Equivalent Norms Let ||.||_1 and ||.||_2 be norms on a vector space X such that X_1 = (X, ||.||_1) and X_2=(X,||.||_2) are complete. If ||x_n||_1 ---> 0 always implies ||x_n||_2 -----> 0, show that converge...
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Action of Lie Brackets on vector fields multiplied by functions tut_einstein Is there a specific product rule or something one must follow when applying the lie bracket/ commutator to two vector fields such that one of them is multiplied by a function Yes. tut_einstein This is the expression given in my textboo...
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Forming first-order difference equation June 7th 2012, 08:30 AM #1 Newbie Joined Oct 2011 Posts 8 Forming first-order difference equation Hi, I was wondering if anyone can help with this mathematical economics problem: The multiplier-accelerator model of growth has the following three equation...
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Showing a formula is a tautology October 7th 2012, 03:40 AM Diligo Showing a formula is a tautology I'm currently enrolled in a introductory course on logic and I'm until now everything has been going great. I'm having some trouble with applying monotonicity and the strengthening/weakening of propositions. ...
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Concavity Question November 6th 2009, 02:59 PM frozenflames Concavity Question Consider the function f(x) = 7x + 8x ^-1. For this function there are four important intervals: (-\infty, A], [A,B),(B,C), and [C,\infty) where A, and C are the critical numbers and the function is not defined at B. Find A ...
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Integrability (meaning) Bill_K No, integrability means: can a given relationship between derivatives be integrated to yield a relationship between functions. For example, given the system ∂f/∂x = F(x,y) ∂f/∂y = G(x,y) does f(x,y) exist? Answer, only if an integrability condition is satisfied: ∂^2f/∂x∂y = ∂^2f/∂y∂x...
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Geometry problem May 18th 2006, 08:14 AM #1 UFOKatarn Guest Geometry problem First, hello all. Great I found this forum. Please help me solve this mistery ----------------------------------------------------------- we have two vertices: A(1,1) B(0,2) and there is also a circle K: ...
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Repeated Game-Inspired Spectrum Sharing for Clustering Cognitive Ad Hoc Networks International Journal of Distributed Sensor Networks Volume 2013 (2013), Article ID 514037, 10 pages http://dx.doi.org/10.1155/2013/514037 Research Article Repeated Game-Inspired Spectrum Sharing for Clustering Cognitive Ad Hoc Networks ...
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Need help w/ pre-calculus summer packet. August 8th 2009, 04:41 PM #1 Newbie Joined Aug 2009 Posts 3 Need help w/ pre-calculus summer packet. I know my title isn't very descriptive, but there are 3 types of questions i'm in the need of help for. I am very appreciative for any help! Write the followi...
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A Product September 27th 2006, 10:02 PM #1 Newbie Joined Sep 2006 From New York Posts 2 A Product The product (1+x+x^2+x^3+...)(1+x^3+x^6+x^9+...)(1+x^5+x^10+.. .)... is the generating function for the number of partitions of n into odd parts. How can you replace some of the plus signs with minu...
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Euler problems/181 to 190 From HaskellWiki < Euler problems (Difference between revisions) ((183) If we must have a solution here, let's at least have a decent one.) m ← Older edit Newer edit → Line 34: ...
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relateing surface area to volume? September 5th 2009, 10:53 AM diver15 relateing surface area to volume? I have a problem that I can't quite figure out. If I have a rectangular prism with a length=L width=W and hight=H and L=W, and the volume of this prism is 10,000 then you could write the volume formula a...
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flux: surface integral May 1st 2011, 02:41 AM #1 Junior Member Joined Apr 2010 Posts 56 flux: surface integral Hi, I need to evaluate the flux integral $\iint F \cdot \hat{n}dS$ for portion of a plane x +2y+3z = 6 in the first octant and vector field F= < xy, -x^2, (x+z) > How do i go abou...
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Please help solve these system of equations January 8th 2011, 12:28 PM #1 Newbie Joined Dec 2010 Posts 13 Please help solve these system of equations Y = C + I + G C = a + bY Solve for Y and C, assuming I, G, a, and b are known. I would like someone to show the steps in algebraically solvin...
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Determining the best population-level alcohol consumption model and its impact on estimates of alcohol-attributable harms Abstract Background The goals of our study are to determine the most appropriate model for alcohol consumption as an exposure for burden of disease, to analyze the effect of the chosen alcohol con...
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Random Attractors for Stochastic Retarded Lattice Dynamical Systems Abstract and Applied Analysis Volume 2012 (2012), Article ID 409282, 27 pages http://dx.doi.org/10.1155/2012/409282 Research Article Random Attractors for Stochastic Retarded Lattice Dynamical Systems ^1School of Mathematics and Statistics, Henan Un...
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Find theta as a function of phi May 10th 2011, 03:33 PM #1 Newbie Joined May 2011 Posts 18 Find theta as a function of phi I have found the equation 2\cos \theta \sin \theta \tan \phi +2\sin \theta ^2 -1=0 and want to solve out \theta as a function of \phi . The history of this equation is from a ph...
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Numerical operations These procedures implement number-theoretic (integer) division: for positive integers n1 and n2, if n3 and n4 are integers such that then (quotient n1 n2) => n3 (remainder n1 n2) => n4 (modulo n1 n2) => n4 For integers n1...
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New Exact Solutions of Ion-Acoustic Wave Equations by ( Journal of Applied Mathematics Volume 2013 (2013), Article ID 810729, 11 pages http://dx.doi.org/10.1155/2013/810729 Research Article New Exact Solutions of Ion-Acoustic Wave Equations by ()-Expansion Method School of Mathematical Sciences, Universiti Kebangsaa...
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-Semigroups and Fractional Abstract Cauchy Problems Abstract and Applied Analysis Volume 2014 (2014), Article ID 357821, 9 pages http://dx.doi.org/10.1155/2014/357821 Research Article Convoluted Fractional -Semigroups and Fractional Abstract Cauchy Problems ^1School of Mathematics and Statistics, Xi’an Jiaotong Univ...
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Fractional Linear Transforms Complex Numbers, Fractional Linear Transforms Fractional Linear Transforms Consider the function f(z) = cz, where c is a complex constant. You may recognize this as a linear transform on the xy plane, since c(a+b) = ca+cb, and c(rz) = rcz for any real number r. However, not all transforms...
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Question regarding angular momentum and velocity.As it relates to a new rate rotation jayced To solve this problem, use conservation of angular momentum. The initial angular momentum is L = I ω I is the initial moment of inertia=2.40 kg-m² ω is the initial angular velocity 1.15 rev / sec converted to into radians...
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Test at 7pm, stuck on Trig Integrals. March 4th 2008, 11:46 AM #1 Junior Member Joined Mar 2008 From Ohio Posts 26 There are two problems on our practice test/solution that I just can't seem to grasp. The first is: Int(tan^2 (x)dx) ... The solution is tanx-x+c, but I don't understand how the prof. got...
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Composite function August 6th 2008, 01:53 PM Snowboarder Composite function So composition function is s(x) = ln(ln(x)) and natural domain is (1, +infinity) So s(s(x)) = s(ln(ln(x)) = ln(ln(ln(ln(x)))) . Is natural domain this function also (1,+infinity)???? What is the axes intercepts of y = s(s(x))...
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Area Integral January 25th 2011, 11:24 PM menco Area Integral I need to find the area of the region between the parabpla y^2 = 16x an the line 4x-3y=4. I understand that i need to get them to both equal y but when i do that i seem to confuse myself and get really odd values. January 26th 2011, 12:22 AM Fe...
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How do I find the mean of categorical data? April 21st 2010, 06:56 AM Warrenx How do I find the mean of categorical data? here is my problem: I am doing this lab on streaks in basketball, like 0=miss, 1=hit once, 2= hit two in a row.. so on. I need to find the mean of this data in terms of its streak, ...
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Maximum Likehood Estimator February 6th 2009, 06:12 PM #1 Junior Member Joined Nov 2007 Posts 58 Maximum Likehood Estimator If f_Y(y;theta) = (theta*k^theta)*(1/y)^(theta+1), y>=k, theta>=1, a) Find the maximum likelihood estimator for theta if information has been collected on a random sample of 25...
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Calculating Work and Mechanical Energy - Block on Ramp A lot of the time, I don't know exactly where to start (at all). My instinct here was to draw a force diagram, figure out friction, do a billion different things to get Forcenet. But actually I asked my teacher and all I needed was to draw a triangle to figure out...
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Proof (Problem Solving) October 20th 2010, 09:18 AM matgrl Proof (Problem Solving) Prove that is p is a prime number greater than 3, then p^2 leaves a reamainder of 1 when it is divided by 12. Is there a form I could use as a prime number to show this works for all odd numbers? October 20th 2010, 06:05 PM...
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Random Variables April 5th 2010, 09:44 PM jjbrian Random Variables A special deck of 50 cards has 5 colors (red, white, blue, purple, and gold); for each color, there are cards numbered 1 through 10. 15 cards are picked at random without replacement from this deck. Let X be the number of purple cards picked....
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Von Neumann Entropy of GHZ state Register to reply by neu Tags: entropy, neumann, state P: 245 I just wanted to run this working by some of you. Simplest Greenberger-Horne-Zeilinger state (entagled) s...
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Momentum Bar Charts (IF Charts, IFF Charts) Disclaimer: I most certainly did not come up with this type of diagram, though the name (IF charts) is probably unique to my classes since it’s based on the way one of my first Modeling Physics students drew her bar charts. This post is meant to be a how-to and a why-to guide...
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Why do smaller black holes emit more Hawking radiation? tensor33 Why is it that the smaller a black hole is, the more Hawking radiation it emits? It seems counterintuitive to me. I would think that a larger black hole with a larger surface area would trap more antiparticles from virtual particle antiparticle pairs, ...
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[ 0.09912109375, -0.026123046875, 0.0341796875, 0.12109375, 0.07666015625, -0.05322265625, 0.01019287109375, 0.07177734375, 0.06640625, -0.031982421875, -0.07080078125, -0.048828125, -0.0198974609375, 0.016357421875, 0.01165771484375, 0.02880859375, 0.126953125, -0.0155029296875, -...
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Quadratic proof February 22nd 2013, 04:22 AM #1 Newbie Joined Feb 2013 From US Posts 14 Thanks 3 Quadratic proof I was doing some problems last night, and I came across this one and I am not sure how to get started. If the polynomial $Eq. A: ax^2+bx+c$ does not have any (real*) roots, prove ...
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On the Generalized Krätzel Transform and Its Extension to Bohemian Spaces Abstract and Applied Analysis Volume 2013 (2013), Article ID 841585, 7 pages http://dx.doi.org/10.1155/2013/841585 Research Article On the Generalized Krätzel Transform and Its Extension to Bohemian Spaces ^1Department of Applied Sciences, Fac...
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Radioactive Decay December 10th 2005, 07:11 PM #1 Newbie Joined Dec 2005 Posts 2 In the formula A=Ie^kt, A is the amount of radioactive material remaining from an initial amount I at a given time t, and k is the negative constant determined by the nature of the material. An artifact is discovered at a...
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Most General solution of Laplace's equation January 16th 2009, 05:35 AM Jason Bourne Most General solution of Laplace's equation Laplace's equation written in plane polar coordinates $(r,\theta)$ is $T_{rr} + \frac{1}{r}T_r + \frac{1}{r^2}T_{\theta \theta} = 0$ I need to find the most general solution ...
5
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Math Help In a right triangle given a=32.8ft and A= 28 deg 30’15” , solve for b and c $\left(28+\frac{30}{60}+\frac{15}{360} \right)^\circ =\frac{685 }{24}^\circ$ Using the Sine Rule: $\frac{a}{\sin A}=\frac{b}{\sin B} = \frac{c}{\sin C}$ $\frac{32.8}{\sin(\frac{685}{24})}=\frac{c}{\ sin90}$ $c \approx 68.65$ Use pyt...
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Probability question January 1st 2012, 06:22 PM #1 Junior Member Joined Feb 2011 Posts 56 Probability question A and B play a series of similar game. The probability that A will win a set is 3/5, and there is no draw for each set. The game will continue until one of them, A or B win 2 sets. Find the ...
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Optimization of Training Signal Transmission for Estimating MIMO Channel under Antenna Mutual Coupling Conditions International Journal of Antennas and Propagation Volume 2010 (2010), Article ID 213576, 10 pages http://dx.doi.org/10.1155/2010/213576 Research Article Optimization of Training Signal Transmission for Es...
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Inequality November 23rd 2008, 01:51 AM #1 Inequality Can anyone tell me how my book went from point a to b? $<br /> |x^2 - 1| < 2 \Rightarrow - \sqrt 3 < x < \sqrt 3 <br />$ I just don't see it...thanks. Try drawing the graphs of $y = |x^2 - 1|$ and $y = 2$. Now calculate the x-coordinate of the i...
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Connected subset October 19th 2010, 12:35 PM tarheelborn Connected subset If $S \subseteq \mathbb{R}$ is bounded below but not bounded above, then $S$ is either $\left( a,\infty \right]$ or $\left[ a,\infty \right)$ for some $a \in \mathbb{R}$. I know from a previously proved theorem that if $S$ is a connec...
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Modular Analysis of Sequential Solution Methods for Almost Block Diagonal Systems of Equations Advances in Numerical Analysis Volume 2013 (2013), Article ID 563872, 7 pages http://dx.doi.org/10.1155/2013/563872 Research Article Modular Analysis of Sequential Solution Methods for Almost Block Diagonal Systems of Equat...
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Fractions Last edited by CSG18; February 18th 2010 at 07:34 AM. The LCD of 6 and 216 is 216. Multiply the first term by 36/36 $\frac{36}{36} \cdot \frac{3\sqrt{2}}{6} = \frac{108 \sqrt2}{216}$ Now they have the same denominator they can be combined $\frac{108 \ sqrt{2} - 8 \sqrt{2}}{216}$ Factor out $\sqrt{2}$ $\frac{...
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Are numbers : (-1)^(i) , 1^(-i) , 1^(i) transcendental numbers? November 30th 2011, 05:24 AM #1 Senior Member Joined Nov 2011 From Crna Gora Posts 420 Thanks 64 Are numbers : (-1)^(i) , 1^(-i) , 1^(i) transcendental numbers? According to Euler's formula : $e^{ix}=\cos x + i\cdot \sin x$ we may w...
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Integrate - Area Under the Curve November 12th 2008, 11:26 PM #1 Newbie Joined Nov 2008 Posts 8 This is the question in my book and I can't seem to get an answer: 14 (a) For the function: It then says (b) With the same function ( And finally.. (however, if we can get the right answer t...
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Order of element November 26th 2006, 05:08 PM #1 Member Joined Nov 2006 Posts 142 Order of element How do you prove that the order of a in Zn (where n is an integer greater than or equal to 1) viewed as a group of order n with respect to addition is n/(gcd(a,n))? Do you mind elaborating on this?...
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regression Cox proportional-hazards regression Description Whereas the Kaplan-Meier method with log-rank test is useful for comparing survival curves in two or more groups, Cox regression (or proportional hazards regression) allows analyzing the effect of several risk factors on survival. The probability of the end...
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limits of sequences April 3rd 2007, 06:23 PM #1 Newbie Joined Mar 2007 Posts 21 limits of sequences find the limit of each sequence: A) Sn = (1 + 1/2n)^(2n) B) Sn = ( 1 + 1/n)^(2n) C) Sn - (1 + 1/n) ^ (n-1) D) Sn = (n/(n+1))^n E) Sn = (1+ 1/2n)^n F) Sn = ((n+2)/(n+1))^(n+3) I...
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partial differential equation How to solve the attached coupled equations for $\psi$ and $u$. Please help me. Its very complex. You can try separation of variables. The given equation is $\dfrac{\partial^2 \psi}{\partial x^2}+\dfrac{\partial^2 \psi}{\partial y^2}=k^2\psi$. Let $\psi(x,y)=a(x)b(y)$ then $\dfrac{\mathrm...
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Sensitivity of a Fractional Integrodifferential Cauchy Problem of Volterra Type Abstract and Applied Analysis Volume 2013 (2013), Article ID 129478, 8 pages http://dx.doi.org/10.1155/2013/129478 Research Article Sensitivity of a Fractional Integrodifferential Cauchy Problem of Volterra Type Faculty of Mathematics an...
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real analysis one sided limits October 2nd 2012, 02:10 PM biga415 real analysis one sided limits hey guys. so im in an introductory real analysis course and I am finding it quite challenging, partially because my teacher isnt great. i went to ask for help on some limit problems but im not sure if his advice ...
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Eigenvalue Questions June 20th 2011, 04:33 AM #1 Senior Member Joined Apr 2009 Posts 306 Eigenvalue Questions I can do i) but just a bit stuck on ii). my working for i) is: E^2-E=0 so that means $\lambda^2-\lambda$ is an eigenvalue of E^2-E=0, since the zero vector only has an eigenvalue of 0...
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Optimization of a 12.5 GHz Microstrip Antenna Array Using Taguchi's Method International Journal of Antennas and Propagation Volume 2011 (2011), Article ID 458569, 9 pages http://dx.doi.org/10.1155/2011/458569 Research Article Optimization of a 12.5 GHz Microstrip Antenna Array Using Taguchi's Method ^1Department of...
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Squared Weights in MBH98 A couple of weeks ago, I said that I would document (at least for Jean S and UC) an observation about the use of squared weights in MBH98. I realize that most readers won’t be fascinated with this particular exposition, but indulge us a little since this sort of entry is actually a very useful ...
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Composite f, g, and/or h January 21st 2007, 04:53 AM symmetry Composite f, g, and/or h For questions 1 and 2 below, let f(x) = x^2, g(x) = 3x and h(x) = (sqrt{x}) + 1. Express each function as a composite of f, g and/or h. (1) P(x) = 3(sqrt{x}) + 3 (2) Q(x) = sqrt({sqrt{x} + 1}) + 1 NOTE: ...
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Sylow group question August 20th 2008, 07:06 PM #1 Newbie Joined Aug 2008 Posts 2 Sylow group question 1.Let G be a group with |G|=p^2*q,where p and q are distinct primes,show that G has a normal Sylow p-subgroups or a normal Sylow q-subgroups. 2.if |G| < 100 and G is non-abelian and simple,then sho...
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Irrational number between these two? January 24th 2008, 07:48 PM #1 Newbie Joined Jan 2008 Posts 2 Irrational number between these two? Hi, I have two questions: 1. Is there an irrational number between 2.6 and 2.6repeating (2.666666...)? 2. Is there an irrational number between 4th root of...
4
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simple integration by parts How do you integrate (re^r/2)dr ? Here is what I have so far, I think I am making a mistake with the integration of e^r/2. (re^r/2)dr u = r dV = e^r/2dr du = dr V = (1/2)e^r/2 uV - (integral of) Vdu so: (1/2)re^r/2 - (integral of)(1/2)e^r/2 dr (1/2)re^r/...
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irrational numbers Can anyone help me with this? "if x is an irrational number, is 2x rational or irrational? explain" If $2x$ were a rational number then there exist integers $a$ and $b$ such that: $2x=\frac{a}{b}$ but then: $x=\frac{a}{2b}$ but that means $x$ is also rational. So if $x$ is irrational $2x$ must also ...
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Combinations May 4th 2008, 07:41 PM #1 Newbie Joined Dec 2007 Posts 15 Combinations Hi guys! Havings a problem with this... how many ways can you have 2 cards of one value and 3 other cards each of a different value? (assuming a standard 52 card deck) My thought process was: C(13,1)xC(4,2)xC(12...
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Integration by Substitution February 10th 2008, 07:26 PM #1 Newbie Joined Feb 2008 Posts 21 Integration by Substitution Hello, I'm having trouble doing this one integration problem and it needs to be done using substitution and only substitution (no integration by parts). I can pretty much figure it out ...
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Solving Trig eqations December 16th 2007, 11:58 AM #1 Newbie Joined Dec 2007 Posts 2 Solving Trig eqations I have two questions: 1-How do I go about solving the equation 3cot² + 5csc =-1 (i couldn't get the angle symbol to appear) 2- I am supposed to solve this eqation (sec(x)=x-3) graphic...
4
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Ground State Robustness as an Evolutionary Design Principle in Signaling Networks Abstract The ability of an organism to survive depends on its capability to adapt to external conditions. In addition to metabolic versatility and efficient replication, reliable signal transduction is essential. As signaling systems are...
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Generalized Köthe-Toeplitz Duals of Some Vector-Valued Sequence Spaces International Journal of Analysis Volume 2013 (2013), Article ID 862949, 7 pages http://dx.doi.org/10.1155/2013/862949 Research Article Generalized Köthe-Toeplitz Duals of Some Vector-Valued Sequence Spaces Department of Mathematics, Inonu Univer...
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Calculus Word Problem Ladder October 25th 2009, 02:00 PM kashifzaidi Calculus Word Problem Ladder A ladder 10 ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 1.5 ft/s, how fast is the angle between the ladder and the ground changing when the bottom of...
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finding the roots March 22nd 2009, 10:04 AM #1 Newbie Joined Mar 2009 Posts 16 finding the roots what is the easiest way of finding the roots of these kind of equations (except guessing): x^4+x^3-7x^2-x+6=0 or x^5-2x^4+2x^3-2x^2+x=0 you can tell rigorously or sth easy. it's OK. a...
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Just need confirmation on a circular function question. July 6th 2008, 08:34 AM #1 Banned Joined Jul 2008 Posts 29 Just need confirmation on a circular function question. determine the value of the following if 0 is less than or equal to theta and theta is less than 2 pie. sec theta= -2root3/3= -roo...
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Choosing numbers from a bag without replacement April 23rd 2010, 12:13 PM #1 Member Joined Jan 2010 Posts 77 Choosing numbers from a bag without replacement A bag contains eleven discs numbered 1 to 11. Two discs are selected at random form the bag. Given that the sum of the selected numbers is even, use...
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Limit Let $a_{1}=\frac{5}{2}$ and $a_{n+1}=\sqrt{ a_{n}^{3} -12a_{n}+\frac{20n+21}{n+1}}$ Prove that the sequence $(a_{n})$ converges and find its limit If the 'recursive relation' is... http://quicklatex.com/cache3/ql_d676...adbc711_l3.png (1) ... it can be written as... http://quicklatex.com/cache3/ql_b7fc...5a37e84...
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Adding and subtracting rational expressions. Please help? November 14th 2012, 02:19 PM #1 Newbie Joined Nov 2012 From United States Posts 8 Adding and subtracting rational expressions. Please help? I have a math problem and the answer to it. The only problem I have is that I cannot figure out how to ...
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What kind of proof to use? Ring Homomorphisms November 30th 2010, 03:08 PM #1 Junior Member Joined Aug 2009 Posts 28 What kind of proof to use? Ring Homomorphisms Hi here is the question prove that every ring homomorphism phi from Z_n to itself has the form phi(x)=ax where a^2=a im just wonderin...
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Existence of a root between 2 given points Well if I read your function correctly (if I am not mistaken you're a PhD student, then why don't you use TeX?), it's: [tex]f(x)=(1-x^2)^2-\sqrt{(1-x^2)(1-\frac{1}{2} x^2)}[/tex] If this is your function then we can see that at x=1 the function vanishes, and you also know th...
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Problem from Lang micromass You must only show that if two of the indices [itex](A:B),(A_f:B_f),(A^f,B^f)[/itex] is finite, then so is the third. Right? Well, maybe you can start by showing that [tex]0\rightarrow A_f/B_f\rightarrow A/B\rightarrow A^f/B^f\rightarrow 0[/tex] is exact. Apologies for not getting bac...
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Sign Inference for Dynamic Signed Networks via Dictionary Learning Journal of Applied Mathematics Volume 2013 (2013), Article ID 708581, 10 pages http://dx.doi.org/10.1155/2013/708581 Research Article Sign Inference for Dynamic Signed Networks via Dictionary Learning State Key Laboratory of Information Photonics and...
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A Weighted Variant of Riemann-Liouville Fractional Integrals on Abstract and Applied Analysis VolumeΒ 2012Β (2012), Article IDΒ 780132, 18 pages http://dx.doi.org/10.1155/2012/780132 Research Article A Weighted Variant of Riemann-Liouville Fractional Integrals on ^1Department of Mathematics, Linyi University, Shando...
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bn_gf2m.c [openssl/crypto/bn/bn_gf2m.c] - Woboq Code Browser 1 /* crypto/bn/bn_gf2m.c */ 2 /* ==================================================================== 3 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 4 * 5 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included 6 *...
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Convergent Geometric Series Suppose we have two convergent geometric series ∑x^n and ∑y^n. Does it ever occur that ∑x^n∑y^n=∑[(x^n)(y^n)]? THANKS. I would say yes. Assume that the lead term is $1$ and that $n$ starts at $n = 0$ then $\sum_{n=0}^\infty x^n = \frac{1}{1-x},$$\sum_{n=0}^\infty y^n = \frac{1}{1-y}$ and $\...
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Math Help May 26th 2007, 02:13 PM #1 Member Joined Nov 2006 Posts 139 series..? I know these are very very basic series(if they are.. If I have the ? [from 1 to 6] of (1/(1.3)^ (s/12)) how do I solve it and why? Thanks for all the help. I'm guessing this is the problem you're trying to so...
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Math Help January 9th 2010, 02:37 PM #1 Super Member Joined Aug 2009 Posts 639 intergral may i know why the answer for integrate exp (x) sin ( exp x) from x= ln (pi) to x= 0 is not 1- cos (ln (pi))? My first reaction was to wonder why you think it should be! But I think I see. I suspect you mad...
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Trigonometry problem Use the law of sines . The law of sines for a triangle is just the relation that the ratio of the sine of an angle by the length of the opposite side of the triangle is a constant for each triangle. With this law you can calculate the size of both sides of the triangle, or quicker you can just co...
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# of binomial coefficients not divisible by 3 is not divisible by 5 December 29th 2009, 04:46 AM #1 Senior Member Joined Nov 2007 Posts 329 # of binomial coefficients not divisible by 3 is not divisible by 5 Show that the number of binomial coefficients not divisible by 3 is not divisible by 5 where the ...
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Patent US6282520 - Computer system and methods for allocation of the returns of a portfolio among a plurality of investors with different risk tolerance levels and allocation of returns from an efficient portfolio FIELD OF THE INVENTION The present invention relates to computer systems and methods for allocation of in...
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Muzzle velocity given test range, time of flight and ballistic properties. This isn't really homework, but I figure this is the most appropriate place to post this... Please do say if you think there is a more likely place it will get answered - I'm new! The problem statement, all variables and given/known data I am t...
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Intersecting Lines in a Plane March 31st 2009, 01:25 PM square Intersecting Lines in a Plane Equation of plane: r= (-3,5,6) + s[-1,1,2] + v[2,1,-3]. I need the equation of 2 intersecting lines that lie on this plane. I know I can use s[-1,1,2], but I need to find another vector that is perpendicular to s[-1,...
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Mutual Inductance of Two RC Circuits? 1. The problem statement, all variables and given/known data In the circuit shown in the following figure(Figure 1) the capacitor has capacitance 20 microF and is initially uncharged. The resistor R_0 has resistance 12 Ohms . An emf of 90.0V is added in series with the capacitor a...
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Sequences and series March 25th 2008, 10:24 AM #1 Member Joined Jul 2007 Posts 147 Sequences and series, a financial application with interest rates, please help me Dear forum members, could you please verify that my calculations are correct A person takes a two million euro loan from a bank with ...
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Controllability of state space equation dabargo 2. Relevant equations [tex] u(t) = -B^T\exp^{A^T(t_1-t)}W_c^{-1}(t_1)[\exp^{At_1}x_0-x_1] [/tex] [tex] W_c(t_1) = \int_0^{t_1} \exp^{A\gamma}BB^T\exp^{A^T\gamma} d\gamma [/tex] Where did you get those equations, your system is not doing what you want it to do I ag...
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How Far Will It Skid? Most driver's education classes teach future drivers that the stopping distance of a skidding car is directly proportional to the square of the speed of the car. That is a car traveling 10 mi/hr may require 4 feet to skid to an abrupt halt; but a car going twice as fast - 20 mi/hr - would require...
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Isomorphism of Rings May 12th 2010, 08:07 PM #1 Member Joined May 2009 Posts 86 Isomorphism of Rings Hello, I was just trying out problems from Herstein, and I have a doubt in this. I would really appreciate any help. Let R be a ring with unit element. Using its elements we define a ring R' by d...
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TRICKY u substitution - are my answers correct September 26th 2009, 07:51 PM #1 Member Joined Dec 2008 From Australia Posts 161 QUESTION ONE $\int z^3\sqrt{z^2 + 1}dz$ $u = z^2 + 1$ $\frac{du}{dz} = 2z$ $\frac{z^2}{2}\int u^\frac{1}{2}\ du$ $\frac{z^2}{2}.\frac{2}{3}u^\frac{3}{2}$ ...
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stationary points of a function of 2 variables May 10th 2008, 08:38 AM #1 Newbie Joined May 2008 Posts 7 stationary points of a function of 2 variables hey i have this problem where z = xy(6-x-y) when multiplying out and differentiating with respect to x i get: dz/dx = 6y - 2xy -y^2 and y dz/dy...
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