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Stoke's Theorem May 8th 2011, 08:08 AM #1 Senior Member Joined Oct 2008 Posts 393 Stoke's Theorem $F = ( y - z + 2)i +(yz +4)j -xzk$, where S is the surface of the cube $x = 0, y = 0, z = 0, x = 2, y = 2, z = 2$, above the xy plane So i have computed $abla x F = -yi + (-1+z)j -k$ now i dont know wha...
5
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Aggregate Clause (Visual Basic) Applies one or more aggregate functions to a collection. Aggregate element [As type] In collection _ [, element2 [As type2] In collection2, [...]] [ clause ] Into expressionList Term Definition element Required. Variable used to iterate through the elements of ...
5
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Eigenvalues of Trees with Perfect Matchings On the k^th Eigenvalues of Trees with Perfect Matchings Wai Chee Shiu, An Chang Abstract Let Τ ^+[2p] be the set of all trees on 2p (p≥ 1) vertices with perfect matchings. In this paper, we prove that for any tree T in Τ ^+[2p] , its k-th largest eigenvalue λ [k] (T...
4
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Calculus Derivatives The key here is the quotient rule: $\frac{d}{dx}\frac{f(x)}{g(x)}=\frac{f'(x)g(x)-f(x)g'(x)}{[g(x)]^2}$ Since $y = \frac{(x+2)(x+4)}{(x-1)}=\frac{x^2+6x+8}{(x-1)}$, we have $\frac{dy}{dx}=\frac{[(x^ 2+6x+8)'](x-1)-(x^2+6x+8)[(x-1)']}{(x-1)^2}$$=\frac{(2x+6)(x-1)-(x^2+6x+8)(1)}{(x-1)^2}=...$ I belie...
5
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Equation of a plane which intersects the two surfaces? October 2nd 2009, 07:13 PM Infernorage Equation of a plane which intersects the two surfaces? The question asks to find the equation for a plane which intersects these two surfaces. I was sure that I solved it correctly, but my professor says it is wrong and...
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Columbia Data Science course, week 11: Estimating causal effects Home > data science , math education , open source tools , statistics > Columbia Data Science course, week 11: Estimating causal effects Columbia Data Science course, week 11: Estimating causal effects November 15, 2012 The week in Rachel Schu...
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. 8. BUCKLING INSTABILITIES AND WARPS The optically visible parts of galactic disks are usually remarkably thin and flat, whereas the more extended HI disks of many edge-on galaxies appear noticeably warped with an integral sign shape. Stellar warps (Reshetnikov et al. 2002, Saha et al. 2009) are much less pronounced...
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Trigonometry Help October 12th 2008, 05:52 AM #1 Newbie Joined Oct 2008 Posts 5 Trigonometry Help Here is the question i need to answer: let f(A) = ((cosA)/(1+sinA))+((1+sinA)/cosA)) prove that f(A) = 2secA I have tried all sorts of things here to try and answer it but just get to 2secA any help woul...
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Ramanujan’s nested radical Ramanujan posed the following puzzle to Journal of Indian Mathematical Society. What is the value of the following? He waited over six months, and when nobody replied he gave his solution. The result is simply 3. Now suppose you didn’t know an algebraic proof and wanted to evaluate the exp...
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tion Graphical and Numerical Descriptive Analysis: Exploratory Tools Applied to Vietnamese Data Dominique Haughton Bentley College Nguyen Phong General Statistical Office, Vietnam Journal of Statistics Education Volume 12, Number 2 (2004), www.amstat.org/publications/jse/v12n2/haughton.html Copyright © 2004 by Domi...
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Volume of a Cone using Trigonometric Ratios January 9th 2010, 09:30 AM #1 Junior Member Joined Oct 2009 Posts 37 Volume of a Cone using Trigonometric Ratios Hi everyone, I can't figure out the following question from my math homework: A right circular cone is inscribed in a sphere of radius 30 ...
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Using a Folding Roof Measurements from the Ground Using a Folding Ruler Slope, Rise, Run, Area measurements using a folding carpenter's rule • ROOF MEASURE by FOLDING RULE - CONTENTS: how to use a folding ruler and very easy on-site observations to measure roof slope, pitch, and size or area. How to use the tange...
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Can this equation be factored? Yes, use the quadratic formula, you'll find two different zero's $x_1$ and $x_2$ therefore the quadratic equation can be factorized as (in general): $ax^2+bx+c=a(x-x_1)\cdot(x-x_2)$ Can you do that? Use the discriminant: $b^2-4ac$ If it is a square number then the equation will factor I...
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[SOLVED] equation of line February 24th 2009, 05:52 PM #1 Newbie Joined Feb 2009 Posts 9 [SOLVED] equation of line Find an equation for the line with the given properties. Perpendicular to the line y=1/3x + 6; containing the point (2,-2) You know the line is perpendicular to y=1/3x+6 so we ...
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constructible universe The constructible universe Definition Gödel’s constructible universe is a subclass $L$ of the von Neumann universe $V$ of well-founded pure sets, defined by transfinite induction? as $L = \bigcup_\alpha L_\alpha$ where $L_0 = \emptyset$ $L_{\alpha +1} = P(L_\alpha) \cap I(L_\alpha \cup \{L_\a...
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Easy question on Sobolev spaces up vote 2 down vote favorite I understand that this question would be trivial for experts, sorry for that, I just need to clarify things. So let $S(\mathbb{R}^n)$ denote the Schwartz space on $\mathbb{R}^n$ and $W_p$, $W_q$ are the Sobolev spaces, or in the other words completions of $...
5
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convergents of sequence July 15th 2009, 06:51 PM #1 Senior Member Joined Jun 2009 Posts 251 convergents of sequence question: what number does $\frac{2^{n}}{3^{n+1}}$ converge to? answer: 0 what I've done: sort of use L'Hopital's rule by taking derivative of numerator and denominator => $\frac{n2...
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Homework Help Posted by Ashley on Sunday, September 6, 2009 at 8:58pm. Hello, A projectile is launched straight up from the ground with an initial velocity of 320 ft/sec. a. When will the projectiles height above the ground be 1024 ft? For this I got 16 seconds b. When will the height of the projectile be at least...
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Help with the quotient rule of derivatives, involving negative exponents. September 4th 2012, 06:46 PM bnosam Help with the quotient rule of derivatives, involving negative exponents. So basically the function is: f(x) = x^2 (x^2 + 1)^-3. I have to use the quotient rule to differentiate it. I just started d...
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Find the number Find the total number of positive integer solutions of: $\frac{2}{n} + \frac{3}{m} = \frac{1}{2006}$ HEllo : remark http://www.mathramz.com/xyz/latexren...320f38cb95.png is not : http://www.mathramz.com/xyz/latexren...45b369c0d5.png conclusion : http://www.mathramz.com/xyz/latexren...bec49c6522.png TH...
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Simplifying If $270^\circ < x < 360^\circ$, simplify $\sqrt{2+\sqrt{2+2cosx}}$ I couldn't do anything else after getting rid of the square roots.. Use the half angle identity for cosine: $\cos{\frac{\theta}{2}} = \sqrt{\frac{1 + \cos{\theta}}{2}}$. $\sqrt{2 + 2\cos{x}} = \sqrt{2(1 + \cos{x})}$ $= \sqrt{\frac{4(1 + \co...
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Math Forum Discussions Math Forum Ask Dr. Math Discussions Internet Newsletter MathTools Teacher2Teacher Teacher Exchange Workshops Search All of the Math Forum: Views expressed in these public forums are not endorsed by Drexel University or The Math Forum. Topic: Cardinalities Replies: 17 Last Post: Jun 18, 2000 ...
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Quantum Blossoms To review for my upcoming final in differential geometry, I will go over my last two midterms. 1. Parametrize the curve $y^2+y=x^2$ using as the parameter $t$ slope of the line from the origin to a point on it, i.e. $y=tx$. The first thing we should do is substitute $tx$ for $y$ in the first equation...
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History of fundamental solutions up vote 16 down vote favorite 7 I have a few questions on the history of PDE. 1. Who first wrote down the formula for the solution of the Cauchy problem for the heat equation involving the heat kernel? I have seen it called Poisson's formula. If it is true Poisson has a formula f...
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sample R Data Analysis Examples Power Analysis for Two-group Independent sample t-test Examples Example 1. A clinical dietician wants to compare two different diets, A and B, for diabetic patients. She hypothesizes that diet A (Group 1) will be better than diet B (Group 2), in terms of lower blood glucose. She plan...
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Falling Bodies Name: Mike Status: other Age: 30s Location: N/A Country: N/A Date: 2000-2001 Question: I'm a Police Officer in Ada, Oklahoma. Last week we had a suicide, where the Individual jumped ...
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Smallest Subgroup of Sn December 9th 2009, 11:43 AM #1 Newbie Joined Sep 2009 Posts 13 Good afternoon fellow math goers. I entered this problem a week ago and with helpful hints have made what I think is progression on this rather challenging problem. I need some advice on my proof though so any more ...
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sry for the trouble! another trigo problem!! February 18th 2008, 07:26 AM #1 Newbie Joined Feb 2008 Posts 6 Hi sry for the previous double post, below is another porblem i faced: given: 0 <= x < pi ; 0 <= y; < pi ... sin^2x = sin^2y (sinx + siny )( sinx - siny ) = 0 thus, how to get ...
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complex analysis series February 14th 2010, 02:43 PM #1 Member Joined Sep 2008 Posts 166 complex analysis series Let $a_n, b_n$ be nonzero complex numbers. Suppose $lim_{n\to\infty}|\frac{a_n}{b_n}|=l$ exists, and $l ot= 0, \infty$. 1. Show that if one of the series $\sum_{n=0}^\infty a_n$ and $\sum_...
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CASt R: Random numbers Random numbers in R It is often necessary to simulate random numbers in R. There are many functions available to accomplish this and related tasks such as evaluating the density, distribution function, and quantile function of a distribution. Distributions intrinsic to R R handles many common...
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Systems of Linear Equations June 14th 2011, 11:31 AM #1 Banned Joined Oct 2009 Posts 39 Thanks 1 Systems of Linear Equations Hello all, i am studding linear Algrabra from my finals in about 5 days :-) I have 2 systems that i dont know exactly how to solve them. Would any1 like to help me so...
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find an integer k such that the subgroup is <k> November 23rd 2013, 07:40 AM #1 Newbie Joined Nov 2013 From The City of Eagles Posts 6 The smallest subgroup containing a collection of elements S is the subgroup H with the property that if K is any subgroup containing S then K also contains H. ...
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Ordinal exponentiation September 22nd 2010, 11:50 PM sroberts Ordinal exponentiation Hi, Suppose we take the usual definition of ordinal exponentiation (sorry for the notation!): a^0 = 1 a^s(b) = a^b x a where s(b) is the successor of b a^b = Ua^c where c < b and b is a limit ordinal Then ...
4
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Setting up linear equations. May 2nd 2011, 06:18 AM #1 Newbie Joined May 2011 Posts 10 Setting up linear equations. In a practise GCSE mock exam paper i saw these 3 questions and i think i have got the right answers but i wondered if you could just check for me. 1. A girl is Y years old. Her father ...
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Probability and Statistics From Example Problems Solutions Manual for "Statistical Inference by Berger and Casella" solution Five cards are randomly dealt from a standard deck of cards. Find the probability of obtaining one pair. solution Five cards are randomly dealt from a standard deck of cards. Find the proba...
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I liked “The Millionaire Next Door” (TMND). I like the lessons it had to offer. I especially appreciate the equation it gives as a way of benchmarking how effectively I am accumulating my wealth. I think it's important to chart your progress over time. I see this as no different between measuring your return against...
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Basic probelm on 2x2 Eigenvector October 5th 2011, 03:51 AM Paymemoney Basic probelm on 2x2 Eigenvector Hi can someone explain to be how they get the eigenvectors for the following matrix $\begin{matrix}2 & -1 \\ -4 & 2 \end{matrix}$ $\begin{matrix}1 & \frac{-1}{2} \\ 0 & 0 \end{matrix}$ henc...
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Maximal Ideal April 19th 2009, 08:59 AM Coda202 Maximal Ideal Let N = {f in Z[x] | f has constant term 0}, clearly N is an ideal of Z[x], show that N is a maximal ideal of Z[x]. April 19th 2009, 09:20 AM TheEmptySet Quote: I don't beleive it is a maximal Ideal... Here is why Define a Homomorphi...
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findFinding a Uniformily Most Powerful Region March 4th 2010, 06:19 PM #1 Member Joined Oct 2009 Posts 218 Finding a Uniformily Most Powerful Region Let $X_1,...,X_{25}$ be from a sample of 25 from a normal distribution $N(\theta,100)$. Find a UMP region with $\alpha = 0.1$ for testing $H_0:\theta=75 \ V...
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proof of harmonic series June 15th 2009, 01:20 PM #1 Junior Member Joined Apr 2009 Posts 41 proof of harmonic series Find an proof for the harmonic series not using the integral test with the following hint. $\sum_{k = 1}^{\infty} = 1 + (\frac{1}{2} + \frac{1}{3}) + (\frac{1}{4} + \frac{1}{5} + \fra...
4
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For which numbers a,b,c,d will the function f(x) satisfy... December 23rd 2009, 04:34 AM #1 For which numbers a,b,c,d will the function f(x) satisfy... Problem: For which numbers $a,b,c,d$ will the function $f(x)=\frac{ax+b}{cx+d}$ satisfy $f(f(x))=x$ for all $x$? --------------------------------...
5
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[SOLVED] Population of bugs Growth Rate February 3rd 2009, 10:24 PM #1 [SOLVED] Population of bugs Growth Rate Suppose that the number of bugs in a rainforest is growing exponentially. There were 2880 bugs after 3 weeks and 5120 bugs after 5 weeks. 1) Find the population growth rate r. 2)How many bugs wer...
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Algebraic integers and UFDs November 2nd 2009, 03:32 AM #1 Member Joined Oct 2008 Posts 130 Algebraic integers and UFDs Let $d$ be an integer (square free, not equal to one) Prove that if $d=1(mod4)$ or $d \leq -3$ then $Z[\sqrt d]$ is not a UFD. I know that 2 is not a prime in $Z[\sqrt d]$. I ...
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Parabola Problems Date: 02/23/97 at 19:00:06 From: Cindy Smith Subject: Re: Parabola Problems A culvert is shaped like a parabola, 18 centimeters across the top and 12 centimeters deep. How wide is the culvert 8 centimeters from the top? I have tried setting it up as a complete the square expression, but I haven'...
4
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find theta find theta without the use of the law of cosines see image attached well my prof told me i didnt need to know that for the test. so im trying to solve it a diff way Hello, calc123! Quote: Find $\theta$ without the use of the Law of Cosines. Code: | x A D + - - - - - o | ** | 5 * * y | * * | θ * * | * * B o...
4
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Equation of a Plane The Vector Equation of a Plane Here, we use our knowledge of the dot product to find the equation of a plane in R^3 (3D space). Firstly, a normal vector to the plane is any vector that starts at a point in the plane and has a direction that is orthogonal (perpendicular) to the surface of the plane....
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Decomposition of Primes as the Sum of Two Squares Date: 12/17/2005 at 12:54:51 From: Geertrui Subject: uniqueness of p=sum of two squares I would like to know why, if you write p (prime) as a sum of two squares, its decomposition a^2 + b^2 is unique (a,b up to +/- 1). I was able to prove that you can write a prime p...
5
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inverse hyperbolic derivative October 26th 2009, 07:19 PM xxlvh inverse hyperbolic derivative So in this question I defined $g(x) = \frac{1}{\sqrt{x^2-6x}}$ and $h(x) = arccoshx$. The function I am then evaluating is $f(x) = h(g(x))$. It is also given that $\frac{dy}{dx}arccoshx = ln(x+\sqrt{x^2-1}), x \geq ...
4
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A decomposition of the "spin representation" of SL(2) up vote 7 down vote favorite 5 Let us take an N-dimensional (N odd) irreducible representation V of SL(2,R). It is known that (e.g., Lie groups and Lie algebras III by Vinberg and Onischik, 1994 p. 94) in V there is an invariant symmetric bilinear form $b$ for the...
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What is Lagrange Inversion good for? up vote 41 down vote favorite 38 I am planning an introductory combinatorics course (mixed grad-undergrad) and am trying to decide whether it is worth budgeting a day for Lagrange inversion. The reason I hesitate is that I know of very few applications for it -- basically just enum...
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Algebric equations in worded text April 25th 2009, 05:30 PM ni93 Algebric equations in worded text I'm just having trouble trying to find the formulas, and I've left studying too late. There are a few, I won't post them all. Just wondering if there could be some hints on how to solve them, or how to find the...
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Global Matrix: assembly In the Finite Element method a dense element matrix A_el of dimensions [ndofel X ndofel] is computed for every element (see Element Matrices: computation). Since neighboring elements share nodes, the individual element contributions need to be assembled (summed up) in the global matrix A. During...
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Find integer solutions to 1/x + 1/y = 1/14 June 16th 2011, 09:03 AM VinceW Find integer solutions to 1/x + 1/y = 1/14 Find all solutions where x and y are integers: $\frac{1}{x} + \frac{1}{y} = \frac{1}{14}$ this can be rearranged to: $\frac{xy}{x + y} = 14$ I know how to solve diophantine eq...
4
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of roof members Calculation of roof members It is important to calculate the dimension of the true length of a roof member. These dimensions are essential to determine the accurate span of rafter, overhang, underpurlins, fan struts ...
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[Numpy-discussion] distance_matrix: how to speed up? Emanuele Olivetti emanuele@relativita.... Wed May 21 09:28:51 CDT 2008 Rob Hetland wrote: > I think you want something like this: > > x1 = x1 * weights[np.newaxis,:] > x2 = x2 * weights[np.newaxis,:] > > x1 = x1[np.newaxis, :, :] > x2 = x2[:, np.newaxis, :] > dista...
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Please Help! May 1st 2007, 09:08 AM whytechocolate01 Please Help! A segment joins the midpoints of two sides of a triangle. Find the value of x. Find the value of y. Please explain how to reach the answer! Thanks! May 1st 2007, 10:55 AM topsquark Quote: It can't be done. The smaller to...
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Sum of reciprocals of Prime Numbers April 21st 2009, 10:19 AM Fulger85 Sum of reciprocals of Prime Numbers Hello, Could anyone please give me a proof using basic/elementary number theory and or calculus of the following: The sum of the reciprocals of primes is approximately equal to log(log(x)) e....
5
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Number of Unordered Partitions Date: 08/18/99 at 03:40:29 From: Nicolae Bonciocat Subject: Formula for the unordered partitions of n Dear Professor, I kindly ask you to inform me if there is any known formula for the number of unordered partitions of a positive integer p(n). Many thanks, Nicolae Bonciocat Date: ...
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The Jewish Calendar: A Closer Look The Jewish Calendar: A Closer Look A month is calculated as 29 days, 12 hours, and 793 "parts" Leap years occur in years 3, 6, 8, 11, 14, 17 and 19 of a 19-year cycle Level: Intermediate Adjustments (dechiyot) prevent round off t...
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Mathematics in the Time of the Pharaohs Used and New from Other Sellers Used and New from Other Sellers from $26.70 Usually ships in 1-2 business days (Save 33%) Other sellers (Paperback) • All (3) from $26.70 • New (2) from $26.70 • Used (1) from $28.10 Note: Marketplace items are not eligible for any B...
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Graphing Trig Functions Date: 05/03/97 at 14:45:08 From: Nem Subject: Trigonometric graphing Dear Dr. Math, To graph the equation y = 3sin4x-3, I know I have to find the amplitude, period, and vertical or phase shift. I know the amplitude is 3, and the period is pi/4, but do I have to factor out the 4 from 4x-3 bef...
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Innocent looking 1st order DE May 9th 2009, 12:03 PM #1 Newbie Joined May 2009 Posts 3 Innocent looking 1st order DE $2y e^{y/x} \frac{dy}{{dx}} - 2x - y = 0$ I'm not sure how difficult you guys at this forum might find this. It took me a long long long time to figure out (I am not a math major). Sh...
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Rectangular to polar equations December 15th 2008, 07:11 PM #1 Newbie Joined Dec 2008 Posts 1 Rectangular to polar equations 8x+7y=5 How do I change this rectangular equation to polar form! Please help it's the last part of my graded for correctness homework assignment! Hello, Xenomorph! ...
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variables, separation ofone of the oldest and most widely used techniques for solving some types of partial differential equations. A partial differential equation is called linear if the unknown function and its derivatives have no exponent greater than one and there are no cross-terms—iterms—i.e., terms such as f f′ ...
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The Chocolate Box Problem Date: 11/11/2002 at 05:13:47 From: Brian Mitchell Subject: The chocolate box problem Given twelve types of chocolates, what is the probability that a box of fifty (randomly selected from an infinite supply with equal probability) does not contain one or more of the types? I can see that the...
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Switch Applet About This Java Applet simulates a MEMS switch using non-linear dynamic models adapted from "Numerical Simulations and Novel Constant-Charge Biasing Method for Capacitive RF MEMS Switch" by JB Lee and Charles L GoldSmith and "Nonlinear Electro-Mechanical Modeling of MEMS Switches" by Jeremy Muldavin and ...
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Particle moving on a line. February 16th 2010, 02:55 PM Silverflow Vector calculus on particle movement Hello, I'm currently working on a question which is about a particle moving across along a line. The particle is moving along the line log (x) at a constant speed of one. When t = 0, the particle is at ...
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A sum-product estimate in Z/p^2Z up vote 8 down vote favorite 2 We are interested in a sum-product type estimate. Let $p$ be an odd prime, and let $A$ be the order $p-1$ subgroup of $(\mathbb{Z}/p^2\mathbb{Z})^\times$. That is, let $A = \langle g^p \rangle$, where $(\mathbb{Z}/p^2\mathbb{Z})^\times = \langle g \rangle...
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Homework Help Posted by Jonah on Friday, March 22, 2013 at 12:35pm. A tank contains exactly 10^(6)liters of pure water. 1.0*10^(-6) moles of HCl (g) is bubbled into this tank. What is the resulting pH? The answer is 7, but I was only able to deduce that based on the fact that water has a neutral pH, but there's a mat...
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Diophantine equation November 21st 2009, 03:53 PM #1 Newbie Joined Nov 2009 Posts 7 Diophantine equation Hello everyone! I have some trouble with this proof: prove that there are infinitely many solutions to the equation: $x^2 + y^2 = z^4 \mbox{, with g.c.d} (x,y,z) = 1$ let $a,b$ be any (positi...
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Homework Help Posted by emmy on Tuesday, November 27, 2012 at 10:59pm. Find equation of the line that passes through the points (2/3,-5/4) and (-3,-5/6). write your answer in slope-intercept form and standard form with integer coefficients. • math - Jennifer, Wednesday, November 28, 2012 at 3:05pm The slope m ...
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Applications of Frobenius theorem and conjecture up vote 21 down vote favorite 6 A theorem of Frobenius states that if $n$ divides the order of a finite group $G$, then the number of solutions to $x^n = 1$ in $G$ is a multiple of $n$. Frobenius conjectured that if the number of solutions is exactly $n$, then the set o...
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Finding ideals of $\mathbb{Z}[x]$ generated by $n$ elements and no fewer up vote 6 down vote favorite 1 As the title says, I'm trying to find ideals of $\mathbb{Z}[x]$ generated by $n$ elements and no fewer. I suspect $(2^k, 2^{k-1} x, 2^{k-2} x^2, ..., x^k)$ is generated by no fewer than $n=k+1$ elements, but I haven...
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Nuclear weapon statistics using monoids, groups, and modules in Haskell Bulletin of the Atomic Scientists tracks the nuclear capabilities of every country. We’re going to use their data to demonstrate Haskell’s HLearn library and the usefulness of abstract algebra to statistics. Specifically, we’ll see that the categor...
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Finding Three Lines that Form a Triangle Date: 08/30/2001 at 16:30:56 From: Joe Kowalski Subject: Triangle Area Puzzle The question is: Find an equation for each of the lines that goes through the point (3,2) forming a triangle of area 12 with the coordinate axes. There are three answers. I have been able to come ...
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ontrol PID Tutorial The three-term controller Open-loop step response Proportional control PD control PI control PID control In this tutorial, we will consider the following unity feedback system: The three-term controller ...
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GMAT Archives - Page 2 of 6 - MathSP Problem: Of the five coordinates associated with points A, B, C, D, and E on the number line above, which has the greatest absolute value? Solution: The absolute value is greatest for the point farthest from the origin (0), which is point A. Strategy: Absolute value is the distanc...
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When can a family of polynomials get a weight function to be made orthogonal? up vote 3 down vote favorite 1 Let $\lbrace P_n(z)\rbrace_{n\in\mathbb N_0}$ be a family of polynomials defined by a generating function $g(t,z)=\sum\limits_{n=0}^\infty P_n(z)t^n$ or by a contour integral $P_n(z)=\frac1{2\pi i}\ oint\frac{g...
4
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Momentum, Mechanics 1 November 24th 2012, 10:30 AM mysur Momentum, Mechanics 1 Two boys, Jason and Keith are travelling on small trucks which are both coasting at 3ms-1 in the same direction along a straight horizontal track. Each boy and the truck he is standing on have a total mass of 120 kg. jason on the ...
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Find the critical numbers? November 29th 2009, 11:38 AM mj.alawami Find the critical numbers? How to find the critical number of the given function: $f(x)= x^3(x-2)^2$ Attempt: $f'(x)=(x^3)(2[x-2][1])+(x-2)^2(3x^2)$ Now we have to equate f'(x) to zero $f'(x)=(x^3)(2[x-2])+(x-2)^2(3x^2) =0$...
4
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Solving a Diophantine Equation Date: 05/01/2005 at 19:58:28 From: OC Subject: Diophantine ! How can I find all integer solutions of an equation in the form aXY + bX + cY + d = 0? For example, 5XY + 3X - 8Y - 8 = 0. I tried solving for Y and got to Y = -(bX + d)/(aX + c) Date: 05/02/2005 at 11:57:18 From: Doctor ...
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ractice Basic trig functions - practice problems These problems are designed to help you learn basic trigonometry ("trig") functions and how to use your calculator correctly. Try solving these on your own (without peaking at the solutions). You may want to download a sheet with all the questions (Acrobat (PDF) 33kB ...
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Polar differential problem with my workings... November 7th 2011, 01:03 PM #1 Junior Member Joined Oct 2011 Posts 37 Polar differential problem with my workings... Hi All, I'm having problems with this question and need someone to look at my workings and give a gentle push in the right direction. If...
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Is it true that exotic smooth R^4 cannot be diffeomorphic to RxN, where N is a 3-manifold? up vote 3 down vote favorite 3 Since $\mathbb{R}$ and any 3-manifold $N$ must be non-exotic, their product $\mathbb{R}\times N$ cannot possibly be diffeomorphic to exotic $\mathbb{R}^4$, correct? Update: Andy Putman already ans...
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Differentiate and Solve for variable October 3rd 2009, 10:08 PM #1 Junior Member Joined May 2009 Posts 47 Differentiate and Solve for variable Question: The function $Y=K^\frac{1}{3}L^\frac{2}{3}$ is Given. a) Find $\frac{dY}{dL}$ b) Solve for "L" in the equation: $\frac{2}{3}K^\frac{1}{3}L...
4
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set theory In contrast to naive set theory, the attitude adopted in an axiomatic development of set theory is that it is not necessary to know what the “things” are that are called “sets” or what the relation of membership means. Of sole concern are the properties assumed about sets and the membership relation. Thus, i...
4
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of S Law of Large Numbers: the Theory, Applications and Technology-based Education Ivo D. Dinov, Nicolas Christou and Robert Gould University of California, Los Angeles Journal of Statistics Education Volume 17, Number 1 (2009), www.amstat.org/publications/jse/v17n1/dinov.html Copyright © 2009 by Ivo D. Dinov, Nico...
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principle angles and related acute angles I'm assuming these are in degrees. \displaystyle \begin{align*} \sin{(5x)} &= 16\sin^5{(x)} - 20\sin^3{(x)} + 5\sin{(x)} \\ \sin{(5\cdot 18^{\circ})} &= 16\sin^5{(18^{\circ})} - 20\sin^3{(18^{\ circ})} + 5\sin{(18^{\circ})} \\ 1 &= 16\sin^5{(18^{\circ})} - 20\sin^3{(18^{\circ})...
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Trigonometric Series App Trigonometric Series Approximations The trigonometric functions are useful for modeling periodic behavior. For example, we may describe the motion of an object oscillating at the end of a spring (ignoring any dam...
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Uniform convergence Hello, I need to investigate Uniform convergence for these two using Weierstrass M-test, 10x in advance. Assaf. For the first problem note $x^n + x^{-n} \leq 2$. Thus, $|f_n(x)| \leq \frac{2n^2}{\sqrt{n!}}$ and $\sum_{n=0}^{\infty} \frac{2n^2}{\sqrt{n!}} < \infty$. I did not do the second problem b...
4
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squares | GeekDad | Wired.com GeekDad Puzzle of the Week Solution: Palindromic Sums of Squares • By Judd Schorr • 10.22.12 • 12:15 AM This past week’s puzzle, as posted: If you have been on Facebook at all over the last year, you have probably seen the “puzzle” where there is a grid, and the question r...
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Hilbert class field February 28th 2010, 10:46 PM #1 Newbie Joined Oct 2008 Posts 24 Hilbert class field For the number fields K whose ring of integer is UFD, why the Hilbert class field of K is K itself??? thanks it's actually an if and only if statement. the reason is quite clear: $\math...
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REARRANGING EQUATIONS rearrange these to make x the subject V W 3X = Y VX-W=2 6X(SQUARED) + VX = Y 1) Have you written: $\frac{VW}{3X}=Y$? If so, multiply both sides of the equation by 3X. $VW=3XY$ Divide both sides by 3Y. $\frac{VW}{3Y}=X$ $\boxed{X=\frac{VW}{3Y}}$ 2) $VX-W=2$ Add W to both sides. $VX-W+W=2+W$ Divide...
4
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How do I find the imaginary number solutions to this problem? January 18th 2011, 03:18 PM thyrgle How do I find the imaginary number solutions to this problem? So I have the following equation: $<br /> r^3 + 4r^2 - 24 = 0<br />$ I can find the real solution of 2 by using synthetic division and finding ...
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Permutations. February 10th 2009, 09:24 PM #1 Junior Member Joined May 2008 Posts 61 Permutations. 9 cards are selected with replacement from a standard pack of 52 cards with 12 picture, 20 odd and 20 even cards. a)How many different sequences of 9 cards are possible? b)How many of the sequences...
4
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Factoring Quadratic Equations. Help needed... April 4th 2014, 02:17 PM #3 Super Member April 3rd 2014, 09:22 PM #2 MHF Contributor April 3rd 2014, 08:40 PM #1 Newbie Re: Factoring Quadratic Equations. Help needed... Hello, smyatsallie! Take the square root of both sides: . . $y - \tfrac{11}{8} \;=\;\pm\...
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Law of Conservation Mass reacting masses equations gcse chemistry Calculations 3. igcse KS4 science A level GCE AS A2 O Level practice questions exercises 3. Law of Conservation of mass calculations • What is the Law of Conservation of Mas...
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representation theoretic interpretation of Jack polynomials up vote 12 down vote favorite 7 Monomial symmetric polynomials on $n$ variables $x_1, \ldots x_n$ form a natural basis of the space $\mathcal{S}_n$ of symmetric polynomials on $n$ variables and are defined by additive symmetrization of the function $x^{\lambd...
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Help with solving a proof by induction September 12th 2009, 06:00 AM #1 Member Joined May 2008 Posts 101 Help with solving a proof by induction Problem: Prove that $1 + \frac{1}{2} + \frac{1}{3} + ... + \frac{1}{n} > \frac{2n}{n + 1}$ where $n \geq 2$ What I have so far: 1) Prove for $n = 2$ ...
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elimination The technique used in the solution of simultaneous equations by which n equations in n variables are reduced to one solvable equation in one variable, the process being repeated until all the equations are solved for all the variables. The process may be performed by establishing the value if one variab...
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