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Project Euler Problem 50 Finally, we made it to the 50th problem! In fact, if this were an old-school Japanese RPG, I’m pretty sure we would be hearing some victory music playing about now… For this problem, we just need to find the sum of the longest sequence of consecutive primes that sums to a prime less than 1,000...
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Law of logarithm inquiry January 20th 2011, 04:30 AM danzig Law of logarithm inquiry I'm curious as to how the answers for these came up. For problem 1, given that log2 7 is approximately equal to 2.8074, find an approximation for each logarithm. Solve log2 3 square root of 7. For problem 2, given that...
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Finding the eigenvalues of a 4x4 matrix? November 5th 2008, 05:50 AM #1 Newbie Joined Nov 2008 Posts 3 Finding the eigenvalues of a 4x4 matrix? Hi! I need help finding the eigenvalues of a 4x4 matrix. Been working with the same problem for 2 days now. I just can't solve it. The matrix (A) is: ...
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Calculus help! Min Max problem November 26th 2008, 05:29 PM #1 Newbie Joined Nov 2008 Posts 5 Calculus help! Min Max problem A printed page is to contain 60cm² of typing with clear margins around, of 5 by 3. Find the minimum area of the entire page? $A=xy$ $60=(x-3)(y-5)$ $\frac {60}{x-3}=y-...
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perform the integration April 19th 2009, 03:06 PM #1 Newbie Joined Apr 2009 Posts 4 perform the integration Can someone show me the solution to this problem? I have the exam tomorrow the integral of e^-3x/12+e^-3x the answer is: -1/3ln|12+e^-3x|+c Thank you!!!! So integrate (e^-3x)/(1...
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Analytic Geometry Homework March 3rd 2008, 12:54 AM valcross Analytic Geometry Homework Well I'm kinda stumped and I need you guys... 1.) The length of a diameter of a circle described by 9x^2 + 9y^2 = 16 is? 2.) Find the equation of the circle with center on x+y = 4 and 5x+2y+1=0 and having a radius o...
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pre-algebra problem August 20th 2009, 05:12 PM #1 Newbie Joined Aug 2009 Posts 3 pre-algebra problem Tina, Dawn & Harry have $175 together. Tina has 3x as much as Dawn. Dawn has 2x as much money as Harry. How much money does each have? Let $T,\,D,\,H$ represent the amount of money Tina, Dawn, and Ha...
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Math Help September 10th 2006, 05:54 PM #16 Not sure what you point is? But I can tell you that over a thirty year stint of teaching real analysis, undergraduate and graduate, we never used anything but the epsilon-delta proofs. Limits, continuity, derivatives, and integrals are all defined using epsilon-del...
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Riemann Integral Proof February 15th 2008, 07:24 AM #1 Newbie Joined Oct 2007 Posts 5 Riemann Integral Proof I am having a bit of trouble with this proof and any insight would be appreciated. Suppose f is a nonnegative Riemann integrable function on [a,b] satisfying f(r) = 0 for all r in $\textbf{Q}...
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Optimization June 11th 2009, 09:29 AM #1 Member Joined May 2009 Posts 93 Optimization A closed box with a square base has a volume of 250 cubic meters. The material for the top and bottom of the box cost $2 per square meter, and the material for the sides cost $1 per square meter. Can the box be cons...
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Triple integral September 23rd 2010, 01:40 PM #1 Member Joined Oct 2009 Posts 195 Thanks 1 Triple integral f(x,y,z) = z Integrate the region W, which is bounded by z = 0 x^2 + 4y^2 = 4 z = x + 2 So I think the "bottom" of the region in the xy-plane should form an elipse, and th...
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experiment/ word problem help October 6th 2010, 04:05 PM #1 Super Member Joined Sep 2008 Posts 607 experiment/ word problem help 2.6 A seed crystal of diameter D (mm) is placed in a solution of dissolved salt, and new crystals are observed to nucleate (form) at a constant rate $r (crystals \\\\ min^{...
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Multivariate Normal Distribution October 6th 2009, 03:58 PM statmajor Multivariate Normal Distribution http://img16.imageshack.us/img16/7703/ass1lx.jpg I know that $f(x_1, x_2, x_3) = \frac{1}{(2 \pi)^{3/2}|\Sigma|^{1/2}}exp(-\frac{1}{2}x \Sigma^{-1} x)$ since n = 3 and mu = 0. I've never used the multi...
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Acceleration varying with speed problem April 12th 2013, 01:26 PM #1 Newbie Joined Apr 2013 From Loughborough Posts 2 Acceleration varying with speed problem Hi, I'm attempting to solve a problem where the torque of a motor varies with RPM linearly. I've done most of the groundwork, and come up ...
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one sided limit help me.. January 18th 2009, 05:54 PM #1 Newbie Joined Jan 2009 Posts 2 one sided limit help me.. find one sided limit 1.)lim x->3+ X^2-4X+6 / square root x- 3 2.)lim t->0+ square root 4+t -2 / square root t can someone teach me how to solve this kind of question thx H...
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Poisson Distribution question August 31st 2011, 12:21 AM #1 Super Member Joined Dec 2008 Posts 509 Poisson Distribution question Hi Can someone tell me if my answers are correct? A machine makes a special type of lining brick at the rate of 25 per hour. Overall about 5% of the bricks are defe...
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Proving inequality through induction May 21st 2012, 05:21 AM alyosha2 Proving inequality through induction $2^k > 4k$ $2^k > 4k = 2^k - 4k < 0$ $2^{k+1}-4(k+1) = 2 x 2^k -4(k+1)$ $> 2 x 4k - 4(k+1)$, using $2^k > 4^k,$ $=8k -4k - 4 = 4k -4$ I don't understand what has happened in the secon...
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Help with factoring cubic polynomials and find the zeros of the function May 2nd 2007, 05:37 AM #1 Junior Member Joined Feb 2007 Posts 53 Help with factoring cubic polynomials and find the zeros of the function Yikes! I spent hours on this problem w/o any result. f(x) = x^3 - x^2 - 2x + 2 = 0 M...
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Integrals Rp_4-5 $\int_1^2 \frac{1}{(x^2-2x+5)^{3/2}}dx=$ $\int 5^{\sqrt{7x+2}}dx=$ In the secound problem i tried maybe $e^{(\sqrt{7x+2}*ln{5})}$ but I don't know how to continue... $\int {\frac{{dx}}<br /> {{{{\left( {{x^2} - 2x + 5} \right)}^{3/2}}}}} = \int {\frac{{dx}}<br /> {{{{\left( {{{\left( {x - 1} \right)}^...
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Normal Distribution Question October 19th 2008, 11:30 PM #1 Newbie Joined Oct 2008 Posts 11 Normal Distribution Question Hi, i have this question The weight of a box of cereal has a normal distribution with mean = 340g and standard deviation = 5g. (c) 30 boxes of this cereal are selected at ra...
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Homework Help Posted by kyu on Monday, May 31, 2010 at 5:44pm. Find the Cartesian form of the parametric equation. x = (2a)(cot T) y = (2a)(sin^2 T) how? lol here's what i got y = (sin^2 T) y = (2a)y^2 y = 2a then? do the same for X? i'm stuck there • Math Trig - MathMate, Monday, May 31, 2010 at 7:29pm ...
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Need help calculating convergence, series. September 27th 2010, 06:21 AM #1 Member Joined Sep 2010 Posts 95 Need help calculating convergence, series. I have an exercise where I'm supposed to find convergence if any and if there are show how it's... constituted. The series: $\[<br /> \displaystyle \...
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linear congruences August 14th 2008, 12:49 AM #1 Newbie Joined Aug 2008 Posts 22 linear congruences Q1.find an inverse of 19modulo 43. so far I have worked through euclids algorithm to find gcd(19,43)=1. however when I try to work the algorithm in reverse to solve 19x +43y=1 I get confused. Q2....
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Numerical Integration of a Class of Singularly Perturbed Delay Differential Equations with Small Shift International Journal of Differential Equations Volume 2012 (2012), Article ID 572723, 12 pages http://dx.doi.org/10.1155/2012/572723 Research Article Numerical Integration of a Class of Singularly Perturbed Delay D...
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A problem on finding orthogonal basis and projection Use the inner product <f,g> = integral f(x) g(x) dx from 0 to 1 for continuous functions on the inerval [0, 1] a) Find an orthogonal basis for span = {x, x^2, x^3} b) Project the function y = 3(x+x^2) onto this basis. -----------------------------------------------...
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Differential equation- unfamiliar forms a. 4+xdy/dx=y^2 b. e^ydy/dx-1=inx c.ycosxdy/dx=2-ydy/dx It would be fine if you just do one- but if anyone is feeling bored- Hello, kingkaisai2! These are all separable . . . $a)\;\; 4 + x\frac{dy}{dx}\:=\:y^2$ We have: . $x\frac{dy}{dx}\:=\:y^2 - 4\quad\Rightarrow\quad \frac{dy...
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Motorboat Speed January 11th 2007, 01:03 PM #1 Banned Joined Jan 2007 Posts 315 Motorboat Speed A motorboat heads upstream on a river that has a current of 3 mph. The trip upstream takes 5 hours, while the return trip takes 2.5 hours. What is the speed of the motorboat? Assume that the motorboat kee...
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Monthly payment amount March 16th 2007, 10:31 PM #1 Newbie Joined Mar 2007 Posts 4 Monthly payment amount Amount of purchases=15,000. Down payment= 2,000. Rate of interest=8%. Term of loan=5 yrs. Monthly payment amount (P and I)=? Find the Monthly payment amount. the answer i got is 322.80. I did th...
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CurveSketching.html Example: We methodically determine each of the properties in the list. > f:=x->x^2/(x^2-9); The domain of f consists of all real numbers x such that the denominator is not equal to zero. > solve(x^2-9,x); Hence the domain is all real numbers excluding 3 and -3. The y-intercept is the point (0,...
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e^A where A is a Matrix A program to compute e^A Message #16 Posted by Valentin Albillo on 3 Dec 2004, 7:52 a.m., in response to message #1 by Harry Hi, Harry: To further show just how easy is it to compute e^A for arbitrary numeric square matrices, here's a subprogram for the HP-71B I've just written right now to pr...
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The sequence s1, s2, s3,.....sn,...is such that Sn= (1/n) - Author Message TAGS: The sequence s1, s2, s3,.....sn,...is such that [#permalink] 17 Aug 201...
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Homework Help Posted by Bakare Olanrewaju on Wednesday, May 14, 2014 at 2:32am. Gina has 24 feet of fence, she wants to make the largest rectangular area possible for her rabbit to play in , what length should she make each side of the rabbit penn? • Math - Bosnian, Wednesday, May 14, 2014 at 3:00am That is ca...
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Linear Transformations February 5th 2010, 12:11 AM #1 Junior Member Joined Feb 2010 Posts 31 Linear Transformations Let u = (1,2), v = (3,1) and T: $R^{2}\rightarrow R$ be a linear transformation such that T(u)= 4 and T(v)= 5. What is T(-3, 4)? (Hint: Write (-3,4) as a linear combination of u and v.) ...
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example of a noncommutative ring R for which R is not isomorphic to R^op June 22nd 2010, 05:29 PM #1 Member Joined Sep 2008 Posts 166 example of a noncommutative ring R for which R is not isomorphic to R^op Give an example of a noncommutative ring $R$ such that $R$ and the opposite ring $R^{op}$ are not ...
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Vector Spaces July 5th 2011, 09:11 AM #1 Newbie Joined Jul 2011 Posts 12 Let W be the subspace of P3(all third degree polynomials) such that p(0)=0, and let U be the subspace of all polynomials such that p(1)=0. Find a basis for W, a basis for U, and a basis for their intersection W and U. Re: Vector...
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using integral test to determine convergence or divergence July 9th 2007, 03:31 PM #1 Junior Member Joined Mar 2007 From Missouri Posts 54 using integral test to determine convergence or divergence Teacher says this converges but I keep getting divergence. What am I missing or messing up on? $\su...
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Vector Algebra (line perpendicular to plane) December 7th 2009, 11:10 PM #1 Member Joined Nov 2009 Posts 151 Vector Algebra (line perpendicular to plane) 1. The problem statement, all variables and given/known data Find the parametric equations for the line which passes through the point (3,5,7) ...
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Stuck on a characteristic PDE October 12th 2012, 01:40 PM #1 Member Joined Jun 2012 From Georgia Posts 175 Thanks 22 Stuck on a characteristic PDE I can't figure this out. The equation is $u_{xx}+4u_{yy}=0$. Solving for y', I get y1 = 2ix + c1 and y2 = -2ix + c2. Then v = y1 - 2ix and w = y2...
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Counting Methods January 14th 2009, 10:51 PM #1 Member Joined Jan 2008 Posts 130 Counting Methods Please help! 1.) Three-letter 'words' are to be made by arranging the letters of the word METHODS. What is the probability that the word begins with a vowel? I tried to do this question by finding...
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Sketch and Find the area of the region determined by the intersections of the curves. January 14th 2013, 12:02 PM JDS Sketch and Find the area of the region determined by the intersections of the curves. Sketch and Find the area of the region determined by the intersections of the curves. y= (2/(x^2+1)), y=...
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Max square/rec area under the curve July 22nd 2009, 04:40 PM #1 Max square/rec area under the curve Hi everyone, I've been working on this optimization problem for awhile now. I guess I don't understand the steps. Here's my work. The Problem Code: A rectangle is inscribed with its base on the x-axi...
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Can I get help on a rate of change problem? August 3rd 2009, 12:58 PM Darkhrse99 Can I get help on a rate of change problem? The rate of change in a person's body temp, with respect to the dosage of X milligrams of a drug, is given by D Prime of x= $\frac{7}{x+5}$ One milligram raises the body temp 2.3* C. Find ...
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Initial value problem February 4th 2010, 02:04 PM KennyP33 Initial value problem I'm so close to the answer, I've narrowed it down to two possibilites, here is the question: Find the initial value problem: $cos(x)dy/dx-ysin(x)=xcos(x)$ Here are my two answers, only varying by the negative sign in ...
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determining Sin x as Cos x = sqrt 3/2 September 6th 2008, 04:35 AM #1 Newbie Joined Sep 2008 Posts 1 determining Sin x as Cos x = sqrt 3/2 Hello I need help in determining Sin x as Cos x = sqrt 3/2. What should I know to be able to do this. and how? I would like a fully detailed explanation if p...
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Ramanujan's factorial approximation Ramanujan came up with an approximation for factorial that resembles Stirling’s famous approximation but is much more accurate. As with Stirling’s approximation, the relative error in Ramanujan’s approximation decreases as n gets larger. Typically these approximations are not usefu...
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show its integral less than half M April 8th 2008, 09:07 AM szpengchao show its integral less than half M suppose f: R--->R has a continuous derivative, f(0)=0, and |f'(x)|<=M for x in [0,1] show that, |integral(f,0,1)|<= half M show that, if given f(1)=0, then |integral(f,0,1)|<= quarter M wh...
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Acta Scientiarum. Agronomy Serviços Personalizados Artigo Indicadores Links relacionados Compartilhar versão On-line ISSN 1807-8621 Acta Sci., Agron. (Online) vol.33 no.2 Maringá abr./jun. 2011 http://dx.doi.org/10.4025/actasciagron.v33i2.8272  ...
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Chemical Calculations - 1 Mole concept calculations A Quick Review prepared by Alex Teoh / 8 Nov 2004 - 0630 hours 1. Calculate the percentage % of: (a) oxygen  (b) water in CuSO[4]. 5H[2]O ┌────────────────────────────────────────────────────────────────────┐ │(a) RMM of CuSO[4]. 5H[2]O is: 64 + 32 + 4 X 16 + 5 ( ...
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ind MIND IF I DO A J Scoring bowling in J Fuck it Dude, let’s go bowling. Inspired by both The Dude and Ron Jeffries who was working on this problem as an exercise in learning J. Of Note I’m pretty new to J, so please do contact me if you notice a mistake. Thanks to Tracy Harms for spotting a few mistakes. There ...
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solve for t September 8th 2008, 01:05 PM #1 Junior Member Joined Sep 2008 Posts 54 solve for t 50000=100*2^(t/3) Solve for t. I'm not sure how to solve for t when it's an exponent and a fraction. Please help because I need the answer to this very soon. $\Rightarrow 500 = 2^{t/3} \Right...
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Differential equation in implicit form January 25th 2009, 09:56 AM #1 Junior Member Joined Jan 2009 Posts 69 Differential equation in implicit form I was wondering if someone could give me some idea as where to start with the following question? Find in implicit form the general solution of the diff...
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Nonlinear Second-Order Model and Equilibrium Point Characteristic Analysis of DC Traction Power Supply System ISRN Applied Mathematics Volume 2013 (2013), Article ID 981692, 8 pages http://dx.doi.org/10.1155/2013/981692 Research Article Nonlinear Second-Order Model and Equilibrium Point Characteristic Analysis of DC ...
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Probability question I'm having difficulty with July 11th 2013, 08:34 PM #1 Newbie Joined Jul 2013 From Calgary Posts 3 Probability question I'm having difficulty with To gauge the relationship between education and unemployment an economist turned to the US Census, from which the following table was...
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help with partial fraction integral April 28th 2009, 10:46 AM #1 Member Joined Feb 2009 Posts 125 help with partial fraction integral I need some help finding C & D in the following integral $\int\frac{2x^3-4x-8}{(x^2-x)(x^2+4)}$ $2x^3-4x-8=A(x-1)(x^2+4)+B(x)(x^2+4)+[C(2x)+D](x)(x-1)$ I use...
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Math Help December 14th 2009, 06:00 AM #1 Newbie Joined Dec 2009 Posts 2 Two adjacent figures are represented by the isosceles trapezoid and the square. What is the difference in the area of these two figures ? EXAM TOMORROW ! and I dont understand Last edited by cookiii; December 14th 2009 ...
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Show a sequence is decreasing September 23rd 2008, 06:06 PM #1 Junior Member Joined Feb 2008 Posts 48 Show a sequence is decreasing $x_{n+1}=2-\frac{1}{x_n}$ I'm trying to do this by induction, I can actually show this for the case k=n. I cannot however do it for the case =1. Also $x_1>1$ ...
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Integrating Factor January 14th 2011, 04:36 PM #1 Member Joined Jun 2010 Posts 205 Thanks 1 Integrating Factor I'm doing Tenenbaum's ODE page 91, problem 16, can't see what's going on. We have $3(x+y)^{2}dx + x(3y + 2x)dy = 0 \Rightarrow \frac{d}{dy}P(x,y) = 6(x+y) \text{and} \frac{d}{dx}Q(x,y) = 3y ...
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[SOLVED] Bounds of Integration April 23rd 2010, 04:51 PM Spudwad [SOLVED] Bounds of Integration I have two problems that are pretty similar: 1. Use a triple integral to find the volume of the solid bound by the parabolic cylinder $y=9x^2$ and the planes $z = 0, z = 9$, and $y = 5$. I have been having i...
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Equation of Equation of a Circle, given three points Problem: Give the general solution to this question: Find a circle given 3 points (a,b), (c,d), and (e,f) Your answer should be in the form of an equation of the circle centered at point (h,k) with radius r, and should look like this: (x-h)² + (y-k)²...
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solving a system of transcendental equations April 16th 2009, 04:32 AM #1 Newbie Joined Apr 2009 Posts 1 solving a system of transcendental equations hi, I want to solve the system of three transcendental equations for A, B & C. 0.97*cos(B)*cos(C)-0.18*cos(B)*sin(C)+ 0.01*sin(B)=0.6304 0.97...
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Increasing function question I just thought of... • /r/math all 11 comments [–]benjorino6 points7 points8 points sorry, this has been archived and can no longer be voted on [–]Majromax5 points6 points7 points sorry, this has been archived and can no longer be voted on There is a bijection between the two, but we'r...
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Factoring by Grouping November 17th 2006, 05:36 PM mmsan Factoring by Grouping note: x^2 means x ( or whatever variable) to the power of 2 p^2-q^2+r^2-2pr factor by grouping ( or any other method) i've tried to factor it into this format: (x-y+z)(x-y-z), but i can't seem to do it. the answer key say...
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Find all values of X that satisfy multiple congruences October 22nd 2010, 05:30 AM #1 Newbie Joined Oct 2010 Posts 9 Find all values of X that satisfy multiple congruences The question I'm given is this: Find all integral values of x such that 2x ≡ 4 (mod 5) and 3x ≡ 2 (mod 7). I can find all v...
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Fourier Transform Help Needed April 27th 2007, 11:07 PM #1 Newbie Joined Apr 2007 Posts 3 Fourier Transform Help Needed DEAR GROUP MEMBERS, I am trying to find the Fourier transform of f(x) defined as, 1, for |x| < a f(x) = 0, for |x| > a. SOLUTION : In the final steps it resol...
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Homework Help Posted by p on Saturday, January 2, 2010 at 3:51pm. The triangle DEF has vertices D(-1,3) E(7,1) and F(4,6). Classify the triangle as: a) isosceles or scalene b) right angled or not • geometry - MathMate, Saturday, January 2, 2010 at 4:28pm An isosceles triangle has at least two equal sides. ...
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Complex Equation of a Plane Problem June 9th 2008, 07:58 PM Morphayne Complex Equation of a Plane Problem Problem: Find the equation of the plane that passes through the line of intersection of the planes $x-y+2z+5=0$ and $2x+3y-z-1=0$, and is perpendicular to the plane $x+2y-2z=0$. Answer: $4x+y+...
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replacing multipication of constant by simpler instructions (LONG) Youfeng Wu <wu@sequent.com> Fri, 23 Oct 1992 20:10:15 GMT From comp.compilers | ...
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Homework Help Posted by Kat on Sunday, January 25, 2009 at 8:55pm. Hi, I'm looking at my book and I can't see how they've gotten this answer: The last bit: -11/20y=-3 Their answer is y=60/11 How did they get that? The full problem, if it helps: 1/4y+2=4/5y-1 1/4y-4/5y=-1-2 -11/20y=-3 y=60/11 Okay, since typi...
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resolving for x I tried to solve thees but 1) sqrt(2x + 1) = x-1 2) -2< x+2/x-1 Last edited by cristinaivelisse; February 17th 2010 at 04:35 PM. $\sqrt{2x+1} = x-1$ square both sides ... $2x+1 = x^2 - 2x + 1$ $0 = x^2 - 4x$ $0 = x(x-4)$ $x = 0 , x = 4$ check for extraneous solution(s) $-2 < \frac{x+2}{x-1}$ $0 < 2 + ...
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All the lepton masses from G, pi, e Mathematics used for the Fine Structure constant formula. Yes it should be called Mathematics rather than "Numerology" This is especially true for the way how the formula for the fine structure constant was generated. It's possible to derive a function's complete Taylor expansio...
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quadratic inequality August 18th 2005, 10:04 AM #1 Newbie Joined Apr 2005 Posts 23 quadratic inequality x^2-2x-8>0 I know that the answer is x>4 or x<-2. My question is why the sign is reversed if there is no multiplication or division on either side? Consider x^2-2x-8 = (x-4)(x+2). This is > 0...
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Wolfram Demonstrations Project Squeeze Theorem Let , , and be functions satisfying for all near , except possibly at . By the squeeze theorem, if then . Hence, equals zero if , or , since is squeezed between and . The theorem does not apply if , since is trapped but not squeezed. For the limit does not exist, because ...
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How many triangles? July 27th 2010, 02:01 AM #1 Member Joined Dec 2008 Posts 152 How many triangles? How many triangles in the picture? I counted over 140 then got lost.. Is there a way to calculate the number of triangles in the picture? 140 seems like too many to me, what about $\bin...
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Homework Help Posted by Jordyn on Monday, October 11, 2010 at 7:17pm. Please help!!!! Solve each system graphically. Be sure to check your solution. If a system has an infinite number of solutions, use set-builder notation to write the solution set. If a system has no solution, state this. 6x - 2y = 2, 9x - 3y = 1 ...
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Work Problem October 13th 2008, 09:25 PM #1 MHF Contributor Joined Jul 2008 From NYC Posts 1,489 Dave can mow his lawn in 20 minutes less time than with a power mower that with his hand mower. One day, the power mower broke 15 minutes after he started mowing and he took 25 minutes more time to com...
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The Asymmetric Top We will ``approximate'' the asymmetric top by a finite set of point masses which are attached to each other by massless, rigid rods which ensure that the motion of the whole ensemble is described by a path in t...
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Latin American applied research Servicios Personalizados Articulo Indicadores Links relacionados Bookmark versión impresa ISSN 0327-0793 Lat. Am. appl. res. v.34 n.3 Bahía Blanca jul./sept. 2004   Decoupling with stability of linear multivariable systems: An algebraic approach J. Ruiz-León CINVESTAV-IPN, Unid...
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Right trapeziod area problem October 13th 2009, 09:17 AM jlefholtz Right trapeziod area problem A right trapezoid has parallel sides AB and CD (AB > CD), a perpendicular side AD. The diagnoal AC equals to the side AB and the side AD equals to the side DC. A line through C, perpendicular to side BC intersects...
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Math Help April 9th 2008, 04:51 PM #1 Newbie Joined Mar 2008 Posts 13 Functions Answer the following questions for the function defined on the interval Remember that you can enter "pi" for A. B. A global minimum for this function occurs at C. A local maximum for this function which is ...
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proof on limits May 3rd 2010, 08:35 AM #1 Junior Member Joined Dec 2009 Posts 30 Problem Let f:R-->R be a differentiable function. Prove that if lim x-->infinity f(x) and lim x-->infinity f'(x) both exist and are finite, then lim x--> infinity f'(x) = 0. Please help and assist in which def or t...
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Fault Diagnosis in Dynamic Systems Using Fuzzy Interacting Observers Advances in Fuzzy Systems Volume 2013 (2013), Article ID 874393, 9 pages http://dx.doi.org/10.1155/2013/874393 Research Article Fault Diagnosis in Dynamic Systems Using Fuzzy Interacting Observers Concern Central Scientific and Research Institute E...
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Solving Quartic April 2nd 2006, 11:18 AM c_323_h Solving Quartic Find all roots of x^4 + i =0. Write answers in trigonometric form. Don't know how to solve quartics. Any help would be appreciated. April 2nd 2006, 01:05 PM ThePerfectHacker Quote: Originally Posted by c_323_h Find all roo...
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martingale proof May 5th 2010, 05:38 AM #1 Newbie Joined Oct 2009 Posts 9 martingale proof I need to do the proof for the second condition but I'm not getting the right answer. $\{S_n , n\geq 1\}$} is a martingale if 1) E[| $S_n$|]< $\infty \forall n$ 2) E[ $S_{n+1}|S_1,...,S_n$] = $S_n \fo...
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M03-34 Author Message 3 This post received KUDOS 00:00 B ...
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Stability Calculation Method of Slope Reinforced by Prestressed Anchor in Process of Excavation The Scientific World Journal Volume 2014 (2014), Article ID 194793, 7 pages http://dx.doi.org/10.1155/2014/194793 Research Article Stability Calculation Method of Slope Reinforced by Prestressed Anchor in Process of Excava...
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Path integral formulation From SklogWiki The path integral formulation, here from the statistical mechanical point of view, is an elegant method by which quantum mechanical contributions can be incorporated within a classical simulation using Feynman path integrals (see the additional reading section). Such simulatio...
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6. Second-Order Dynamical Systems Astronomy 626: Spring 1997 The Newtonian equations of motion are second-order in time; thus both positions and velocities are needed to specify the dynamical state of a classical system. The simplest systems are those with one degree of freedom. 6.1 Equations of Motion Consider a s...
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finding horizontal tangents using d/dx of trigs October 24th 2012, 08:12 AM #1 Member finding horizontal tangents using d/dx of trigs Last edited by kingsolomonsgrave; October 24th 2012 at 08:52 AM. Re: finding horizontal tangents using d/dx of trigs Yes, that's what happens. $\sin 2x = \frac{\sqrt{3}}...
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A New Modified Hybrid Steepest-Descent by Using a Viscosity Approximation Method with a Weakly Contractive Mapping for a System of Equilibrium Problems and Fixed Point Problems with Minimization Problems Abstract and Applied Analysis Volume 2012 (2012), Article ID 206345, 29 pages http://dx.doi.org/10.1155/2012/206345 ...
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Probably Overthinking It Way back in February I analyzed data from the National Survey of Family Growth (NSFG) and answered the question " Are first babies more likely to be late? " Now I am getting back to that data to look at the related question, "Are first babies more likely to be light ?" In Think Stats (Ch...
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rate of change December 11th 2008, 07:19 PM #1 Newbie Joined Dec 2008 Posts 22 Q1- The distance traveled by an object at time t ≥ 0 is s = f(t) = t^2 where s is in meter (m) and t in seconds (sec). Find the instantaneous velocity of the object at t = 2sec Q2- Find the natural domain of the given fun...
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Is my inverse right? January 8th 2014, 02:45 AM #3 Junior Member January 7th 2014, 11:46 AM #2 MHF Contributor January 7th 2014, 10:46 AM #1 Junior Member Re: Is my inverse right? The domain/range (x axis) is restricted to being less than or equal to 1 or less than or equal so as to eliminate the possibility...
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Compound Angle November 9th 2009, 07:30 PM #1 Newbie Joined Nov 2009 Posts 3 Compound Angle Angle a lies in the second quadrant and angle b lies in the third quadrant such ath cos a = -3/5 and tan b = 24/7 determine an exact value for cos(a+b) and sin (a-b) I got cos(a+b) = cosacosb...
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Suffix Notation April 25th 2009, 08:12 AM #1 Member Joined May 2008 Posts 106 Suffix Notation Hi I;m just learning suffix notation and the summation convention. Just to check my understanding can someone just check to see if I've done this right, Define a new sort of multiplication by $(\...
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logs. is my work correct? May 22nd 2007, 05:19 PM #1 Junior Member Joined May 2007 Posts 31 logs. is my work correct? are these right? 3^2x=75 ---> i got log75/2log3 solve for x log(2)x = 5 ---> i got x = 32 solve for x e^3x-2=5 ----> i got x ~ 0.6486 solve for x 2^2x=8^x-...
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trigonometry question October 3rd 2009, 06:17 AM #1 Senior Member Joined Jan 2009 Posts 381 trigonometry question solve for x , -180<x<180 2cos x+1= sin x This is what i did .. sin x -2 cos x=1 $\sqrt{5}\sin (x-63.43)=1$ so x-63.43=26.57 x=90 and x-63.43=-26.57 , -153.4...
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Compound Angles December 14th 2013, 09:59 AM #1 Newbie Joined Oct 2013 From UK Posts 5 hi people i have a question on compound angles which im finding quite annoying could someone show me how to solve the following questions: express the following 1. 6sinwt - 8coswt in the form of: R sin(Θ -...
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the encyclopedic entry of boltzmann's constant In statistical thermodynamics , Boltzmann's equation is a probability equation relating the entropy S of an ideal gas to the quantity W , which is the number of microstates corresponding to a given macrostate : $S = k log W !$ (1) where k is Boltzmann's c...
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Math Help Challenge Problem: $\int^{\infty}_{0} \frac{\sin^{3} x}{x^{2}} \ dx$ Moderator Approved - CB Last edited by CaptainBlack; May 4th 2010 at 12:52 PM. starting with by parts we have: $\int_0^{\infty} \frac{\sin^3x}{x^2} \ dx = 3 \int_0^{\infty} \frac{\sin^2 x \cos x}{x} \ dx = 3 \int_0^{\infty} \int_0^{\infty...
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2nd ODE -- Finding Particular solution with A constant term !! November 12th 2009, 12:07 PM ZaZu 2nd ODE -- Finding Particular solution with A constant term !! Hello all, I am struggling to solve this question .. I know how to solve non-homogenous 2nd ODE if we have cos, sin and exponents .. but for in ...
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