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Simple Trigonometry Help January 24th 2009, 09:18 PM #1 Newbie Joined Jan 2009 Posts 16 Simple Trigonometry Help Hey umm how do i find the degrees for sin thetha = - sqrt of 3 /2 The degree answer in my textbook says 240 degrees? You should know that the reference angle is $\sin^{-1} \frac{\sqr...
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th Math::PlanePath::ImaginaryHalf -- half-plane replications in three directions use Math::PlanePath::ImaginaryBase; my $path = Math::PlanePath::ImaginaryBase->new (radix => 4); my ($x, $y) = $path->n_to_xy (123); This is a half-plane variation on the ImaginaryBase path. 54-55 50-51 62-63 58-59 22-23 18-19 3...
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Complex power series help March 30th 2008, 05:04 AM #1 Newbie Joined Mar 2008 Posts 4 Complex power series help Hello everyone, Firstly, I am new and my apologies if my questions are buried somewhere in the thread heap already. I am taking a complex analysis course, and well, its 2complex4me! So...
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How to calculate arc length in unit circle December 7th 2011, 05:58 AM subuntu How to calculate arc length in unit circle Attachment 23030 What is the method of calculating arc length in In the image above . x & y is known Thanks . Feuilleton : Obviously, the use of calculators and trigon...
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Optimization Travel Agency May 16th 2010, 10:27 AM #1 Newbie Joined May 2010 Posts 1 Optimization Travel Agency A travel agent currently has 80 people signed up for a tour. The price of a ticket is $5000 per person. The agency has chartered a plane seating 150 people at a cost of $250 000. Additional cos...
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chinese remainder theorem June 22nd 2009, 07:23 PM #1 Junior Member Joined Jun 2009 Posts 25 chinese remainder theorem x congruent to 4 (mod 11) x congruent to 3 (mod 17) M = 11 * 17 = 187 so M1 = 11, M2 = 17 i'm trying to find the inverse of M1 and M2 but am unsure how because M1M1' c...
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Challenging Integral?. June 7th 2008, 09:23 AM #1 Challenging Integral?. This may not be that bad, but give it a go for those who wish. Let's see what interesting methods are come up with. $\int_{0}^{1}ln(x)ln(1-x)dx$ We know that $-\sum_{n=0}^{\infty}\frac{x^{n+1}}{n+1}=\ln(1-x)$ so then I th...
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traveling car October 30th 2005, 09:20 PM #1 Member Joined Sep 2005 Posts 136 please help its urgent A car traveling at a rate of 30 ft/sec is approaching an intersection. When the car is 120 ft from the intersection, a truck traveling at a rate of 40 ft/sec crosses the intersection. If the roads are...
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Archimedes and the Area of a Parabolic Segment Many of his inventions and mathematical discoveries were years ahead of their time. It’s amazing how inventive you become when you are constantly under attack from your enemies. Finding the area under a curve had been a problem for many years. Fair trade depended (in pa...
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How am I looking at this Limit wrong? May 19th 2011, 12:27 PM #1 Member Joined Aug 2010 Posts 138 How am I looking at this Limit wrong? Here's the limit I'm working with: $\displaystyle\lim_{x\to\infty}(1 + \frac{2}{x})^x$ Now, I understand that the correct answer is $e^2$. While I don't fully...
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Domain and Range August 2nd 2006, 07:53 PM pashah Domain and Range Find the domain and range for each quadratic function. a. y = x^2 – 6x +5 b. y = 3x^2 + 2x +9 August 2nd 2006, 10:29 PM CaptainBlack Quote: Originally Posted by pashah Find the domain and range for each quadratic functi...
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Help me with math puzzle Moderator Registered: 2010-06-20 Posts: 6,097 Re: Help me with math puzzle Member Registered: 2014-06-26 Posts: 29 Help me with math puzzle 30 laborers, working 7 hours a day can finish a piece of work in 18 days. If the laborers work 6 hours a day, then what is the ...
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Is set {x, sinx, sin2x,}in C[0,1] linearly dependent or independent? March 11th 2009, 08:29 AM rick81 Is set {x, sinx, sin2x,}in C[0,1] linearly dependent or independent? Is set {x, sinx, sin2x,}in C[0,1] linearly dependent or independent? I understand the problem is to show if c1v1+c2v2+c3v3=0 i...
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Another Trig Antiderivative February 27th 2008, 12:47 PM #1 Member Joined Feb 2008 Posts 102 Another Trig Antiderivative Here's another one for you folks: $\int sin^3(x)cos^3(x)dx$ I have no idea which trigonometric identity to use... could you guys give me an idea. I feel like the only on...
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How do the number of plane curves over a finite field of a fixed genus increase with the degree? up vote 6 down vote favorite 2 Let $k$ be a finite field. We define $N(d,g)$ to be the number of plane curves $f(x,y)$ defined over $k$ of degree $d$ with (geometric) genus $g$. If $D(d) := (d-1)(d-2)/2$ (the maximum possi...
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Continuously selecting elements from unordered pairs up vote 15 down vote favorite 3 The symmetric square of a topological space $X$ is obtained from the usual square $X^2$ by identifying pairs of symmetric points $(x_1,x_2)$ and $(x_2,x_1)$. Thus, elements of the symmetric square can be identified with unordered pair...
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Calculus Homework, Tutor couldn't help, I've hit the wall The sum of the 6th power identities, huh?. Well, here is my way. Years ago when I figured this out, I thought I had done something. But, it would be silly to think it was original, afterall. Consider $(k+1)^{7}-k^{7}=7k^{6}+21k^{5}+35k^{4}+35k^{3}+21k^{2}+7k+1$ ...
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number of solutions within 360 degrees May 17th 2011, 01:01 AM furor celtica number of solutions within 360 degrees Solve the following equation of A, giving solutions in the 0<A<360 inclusive (i don't know how to make the 'or equal to' sign): sin2A - (sqrt3)(cos2A) =0 So I did it like this Taking B=...
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Frobenius method, reduction of order technique April 29th 2012, 06:45 PM #1 Newbie Joined Apr 2012 From Gotham City Posts 1 Frobenius method, reduction of order technique So this is the problem: xy^'' + y^'- xy = 0 Find the first nonzero terms in a Frobenius series solution of the given diff...
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Factor group order question April 9th 2008, 02:16 AM #1 Junior Member Joined Mar 2008 Posts 33 Factor group order question $<x> \cong C_9 \cong <y>$ and $G = <x> \times <y>$. What is the factor group $G/<x^3,y^3>$ order and write it as the direct product of cyclic groups. Isn't $G/<x^3,y^3>$ has...
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conormal sequence of quotient of locally complete intersection up vote 1 down vote favorite 1 Let $V=\mathbb{A}_{\mathbb{C}}^n/G$ be an quotient singularity where $G=\mathbb{Z}/r\mathbb{Z}$ and $G$ acts on $\mathbb{A}^n$ by $(x_1,\ldots,x_n) \mapsto (\zeta^{a_1}x_1,\ldots,\zeta^{a_n}x_n)$ ($\ zeta$: $r$-th root of uni...
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Truth value of the statement September 30th 2008, 05:50 AM #1 Junior Member Joined Sep 2008 Posts 37 Truth value of the statement P(x,y) means "x + 2y = xy", where x and y are integers. Determine the truth value of the statement. (a) P(1,-1). (b) P(0, 0). (c) ∃y P(3, y). (d) ∀x ∃y P(...
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Expectation of a Variable May 11th 2011, 11:37 AM AshleyT Expectation of a Variable Quote: dice has faces numbered 1 to 6 and is weighted so that the probability of throwing n (n = 1; 2; :::; 6) in a single throw is proportional to n, i.e., equals Cn for some constant C. (a) Find C . (b) Let...
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Differential Equations and Linear Algebra Differential Equations and Linear Algebra 2250-2 10:10am 13 Dec 2007 Instructions. The time allowed is 120 minutes. The examination consists of six problems, one for each of ch...
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Orbit of the identity matrix under Lie group algebra actions up vote 2 down vote favorite I would like an explicit description of $\mathbb{R} SO(n) I_n$, i.e., the image of the identity under the action of the group algebra of $SO(n)$ by left multiplication. Equivalently, what is an explicit description of the vector ...
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Angular and Linear Speed. May 8th 2013, 05:01 PM #1 Junior Member Joined Apr 2012 From Seattle, Washington Posts 72 Angular and Linear Speed. My prof posted this problem as an example and, going over the steps, I haven't been able to work out how he got to the final answer. A car has tires with ...
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Sketching Regions in the Complex Plane March 22nd 2011, 05:49 AM #1 Junior Member Joined Mar 2011 Posts 36 Sketching Regions in the Complex Plane Hi, could someone please show me how to sketch this region? $A = \left \{ Z\:\epsilon \: \mathbb{C}\, \left | \ \left |Z - i \right | < 3\: and \: Re\, Z ...
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Descriptive Statistics Statistics provides methods for collecting, organizing, summarizing, presenting, analyzing and interpreting data. For this purpose the study is broadly divided into two branches. 1. Descriptive statistics 2. Inferential statistics Descriptive statistics provides methods to process raw data ...
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Trig Functions Date: 9/29/96 at 16:19:20 From: Ron Turner Subject: Help Dr. Math, I am having a real problem knowing when to use sine, cosine, and tangent. I am taking geometry by home study and don't quite understand. Thanks! Shauna Date: 10/29/96 at 20:16:16 From: Doctor Lynn Subject: Re: Help Shauna, The f...
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Find the supremum and infimum of S, where S is the set S = {√n − [√n]} September 29th 2010, 03:25 PM #1 Junior Member Joined Sep 2010 Posts 32 Find the supremum and infimum of S, where S is the set S = {√n − [√n]} Find the supremum and infimum of S, where S is the set S = {√n − [√n] : n belongs to ...
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This is a mean with percentage problem... May 23rd 2012, 11:12 AM #1 This is a mean with percentage problem... Mr. Ramirez and Ms. Jonsey gave tests to their classes with the results seen in the table. Overall Mean Mean for Females Mean for Males Percent Females Ramirez 218 230 ...
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complex problem Find the real values of the parameter a for which at least one complex number z=x+iy satisfies $|z+\sqrt{2}|=a^{2}-3a+2$ and $|z+i\sqrt{2}|<a^2$ |z- a|= r can be interpreted as a circle, in the complex plane, with center at a and radius r. In particular, $|z+ i\sqrt{2}|= a^2$ is a circle with center at...
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Fractional Algebriac Equation help!! September 16th 2012, 01:26 PM #1 Newbie Joined Sep 2012 From CT Posts 5 Fractional Algebriac Equation help!! Hi, when I try to solve the equation below, I come up with 36, as seen below. I multiply each term by two in order to get rid of the fractions. The correct...
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Rational expressions September 15th 2006, 03:30 PM danielle_54321 Rational expressions Simplifying Rational expressions. 4x + 4/ 3x-3 X 6x - 6/5x+5 the question askes to simplify by bringing both terms to lowest common terms before multiplying. The answer is supposed to be 8/5, where 1, -1 are not equa...
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[ -0.01019287109375, -0.00022411346435546875, 0.08544921875, 0.02490234375, -0.01513671875, -0.00762939453125, -0.00860595703125, -0.012451171875, 0.0284423828125, -0.0238037109375, 0.033935546875, -0.08837890625, 0.044921875, 0.064453125, -0.04296875, 0.0849609375, -0.05517578125, 0...
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C/N Ratio Tom Richard and Nancy Trautmann Once you have calculated the moisture content of your compost mixture, the other important calculation is the carbon-to-nitrogen ratio (C/N). Grass clippings and other green vegetation tend to have a higher proportion of nitrogen (and therefore a lower C/N ratio) than brown v...
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[ 0.01031494140625, -0.0380859375, -0.0186767578125, -0.0235595703125, 0.03759765625, -0.04345703125, -0.0291748046875, 0.0146484375, 0.005096435546875, 0.01251220703125, -0.06005859375, -0.0751953125, -0.0771484375, 0.03564453125, -0.0120849609375, 0.0037994384765625, 0.06884765625, ...
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Binomial distribution April 25th 2010, 12:03 AM #1 Member Joined Jul 2007 Posts 147 Binomial distribution Hello! My Problem: A crossword puzzle is published in a magazine 6 times a week(all days except Sunday). A woman is able to complete on average eight out of ten crosswords. Given that she co...
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Math Help March 4th 2014, 02:07 PM #1 Newbie Joined Jan 2013 From Portugal Posts 4 vectors I want to proof that, given vector a non zero and a vector b, so $a.b=0 <=> \exists c: c\times a=b$ I know how to proof <= but how to proof =>? My try: $a.b=0 => \exists c: c\times a=b$ ...
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Medicine and Math - Math Central Natasha Glydon Both doctors and nurses use math every day while providing health care for people around the world. Doctors and nurses use math when they write prescriptions or administer medicat...
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[ 0.06396484375, -0.0181884765625, 0.000823974609375, -0.03515625, -0.115234375, -0.06005859375, 0.045654296875, 0.142578125, 0.022705078125, -0.0137939453125, -0.002288818359375, 0.051025390625, 0.0625, 0.07568359375, -0.08740234375, -0.041259765625, -0.0130615234375, -0.01818847656...
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Tarski's caracterisation of REGULAR cardinals up vote 1 down vote favorite Alfred Tarski, in his paper "Ueber unerreichbare Kardinalzahlen" Fund. Math. 1938 proves the following ZFC theorem "if the cardinal of the set Y is equal to the cardinal of the set of subsets of Y that are not equipotent to Y, then the cardinal...
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Finding Least Common Multiple (LCM) by Factoring Date: 10/19/2001 at 01:13:45 From: Laura Subject: Prime factoring My math book has the example: Find the least common multiple of 6, 8, and 9. 6 = 2 x 3 8 = 2 cubed 9 = 3 squared the least common multiple of 6, 8, and 9 is 2 cubed x 3 squared...
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Cardan's Cubic Method Date: 7/19/96 at 23:36:50 From: Peter W. Messer Subject: Cardan's Cubic Method; an Algebraic Mess Dear Dr. Math, Cardan's well known formula solution of cubic equation x^3 - 3x^2 - x - Sqrt[2] = 0 gives us a single "monstrous" algebraic real root which appears to defy further simplification to...
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Two-convexity ⇒ Lefschetz? up vote 30 down vote favorite 7 Assume that • $\Omega$ is an open simply connected set in $\mathbb R^n$ • (two-convexity) if 3 faces of a 3-simplex belong to $\Omega$ then whole simplex in $\Omega$. Is it true that any component of intersection of $\Omega$ with any 2-plane is simply co...
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L'Hospital's Rule True/False November 23rd 2008, 11:53 AM coldfire L'Hospital's Rule True/False Hi, can anyone tell me which of these are wrong? 1. The indeterminate form of type "0/0" can approach any real number as a limit -- False 2. There is a natural number n such that the power function f(x)=x^n ...
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2 RECITATION PROBLEMS CHAPTER 2 WEEK 3 2.30 Blackout? A jet fighter pilot wishes to accelerate from rest to 5g to reach Mach 3 (three times the speed of sound) as quick...
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Math Help April 26th 2010, 03:18 AM #1 Fourier series Find the Fourier series of the function $f(x)$, with a period of $2\pi$, defined by $f(x)=$ $x : 0\leq x\leq\pi$ $0 : -\pi\leq x<0$ (Sorry, couldn't get the coding right to write it out properly). I need a fairly lengthy explanation on...
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How do I make the conceptual transition from multivariable calculus to differential forms? up vote 91 down vote favorite 106 One way to define the algebra of differential forms $\Omega(M)$ on a smooth manifold $M$ (as explained by John Baez's week287) is as the exterior algebra of the dual of the module of derivations...
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Integration June 24th 2008, 01:59 AM #1 Junior Member Joined Apr 2008 Posts 72 Integration Here a few questions i had solved by the method that was asked for can someone please check my answers: 1) find integrate 4x/(x^2+2x+5) dx I got 2ln((x+1)^2+4) -2Arctan((x+1)/2) +C 2) find integrate ...
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Lie group analysis and similarity solutions for hydro-magnetic Maxwell fluid through a porous medium Abstract The equations of two dimensional incompressible fluid flow for hydro-magnetic Maxwell fluid through a porous medium have been studied. Lie group analysis has been employed and the group invariant solutions are...
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Does there exist an event independent of a given sigma-algebra? up vote 11 down vote favorite 4 The following question came up in a discussion with my advisor: Let $(\Omega, \mathcal F, \mathbb P)$ be a non-trivial probability space, and suppose that $\mathcal G$ is a proper sub-$\sigma$-algebra of $\mathcal F$. ...
5
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Calc Word Problem... Need Help! April 12th 2010, 05:47 PM #1 Member Joined Dec 2009 Posts 96 Calc Word Problem... Need Help! I have been trying to figure out this problem. I have the answers in the back of the book and saw an attempt of it online, and still am not understanding what was done. The qu...
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Trigonometry Word Problem January 26th 2009, 03:15 PM #1 Newbie Joined Jan 2009 Posts 2 Trigonometry Word Problem A sailor at the seashore watches a ship with a smokestack 30 meters above water level as the ship steams out to sea. The sailor's eye level is 4 meters above water level. About how far is the...
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Sketching graphs January 3rd 2013, 01:28 PM bensho92 Sketching graphs Can anyone help me in sketching a graph of N against t from this? $N(t) = \frac {-6}{25}$t^2 + $\frac {6}{5}t$ Maybe then i can figure out how to then sketch a graph of this(Thinking): $N(t) = \frac {-1}{25}$t $(t – 5) (t + 4)$...
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Explicit metrics up vote 40 down vote favorite 17 Every surface admits metrics of constant curvature, but there is usually a disconnect between these metrics, the shapes of ordinary objects, and typical mathematical drawings of surfaces. Can anyone give an explicit and intuitively meaningful formulas for negative...
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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: ode45 solver and outputfcn Replies: 2 Last Post: A...
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The Inverse of the Euler Totient Function MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. How can we calculate the cardinality of the inverse of Totient function of any positive integer n ? I tried going through this pape...
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lottery game question January 26th 2011, 12:18 AM #1 Senior Member Joined Nov 2010 From Hong Kong Posts 255 lottery game question Question. Consider the following lottery game involving two urns: - Urn A: five balls, labelled 1 to 5 - Urn B: five balles, four green and one red. Tickets c...
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Green's Theorem March 1st 2013, 06:37 AM usagi_killer Green's Theorem http://img546.imageshack.us/img546/3171/integralbo.jpg For the above expression, I was told that it can be proven using Green's Theorem on the line integral on the RHS, however I can't seem the prove the equality. Note that $G$, $H$...
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General gluing theorem for adjunction spaces up vote 3 down vote favorite Consider the following interesting theorem:(7.5.7, p.294 in Topology and Groupoids by Ronald Brown) Gluing theorem for adjunction spaces: Suppose that we have the following commutative diagram of topological spaces and continuous maps: where $...
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Center of a Symmetric Group on an Infinite Set up vote -1 down vote favorite Let $X$ be a set, $G$ the group of bijection on $X$. Then it is well-known that if $|X|\geq 3$, $Z(G)$ is trivial. However, I cannot see a way of extending this proof to $X$ being an infinite set (other than when a bijection only moves finite...
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Marathon Prizes Associated Topics || Dr. Math Home || Search Dr. Math Marathon Prizes Date: 01/10/98 at 22:15:49 ...
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Tangent Function and the Unit Circle Date: 06/06/2002 at 06:43:05 From: Andy Subject: Trigonometric Functions and the Unit Circle Hi Dr. Math, I have a question regarding a response in your archive: Trigonometric Functions and the Unit Circle http://mathforum.org/library/drmath/view/53941.html In this response...
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Spearmans Rank Help March 16th 2011, 10:22 AM #1 Newbie Joined Mar 2011 Posts 2 Hey, I think I'm posting in the right section of the forum. I'm not really sure what Spearman Rank Correlation test falls under. I'm having trouble understanding it fully. I have two sets of data. Data 1 6.3 5...
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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: Crank Nikolson scheme for semi linear parabolic ty...
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transform a polynomial into another one upto a constant up vote 0 down vote favorite 1 I have a polynomial $p(x)=a_Nx^N+a_{N-1}x^{N-1}+\dots+a_0$. I want to convert this into another polynomial of same order, say $b_Ny^N+b_{N-1}y^{N-1}+\dots+b_0$. Is it possible to find a transformation $y=f(x)$ that will transform th...
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More antiderivative questions November 30th 2008, 06:33 PM #1 Newbie Joined Nov 2008 Posts 4 More antiderivative questions 1) f(x) = -13/(1 +x^2 ) The question is to find the antiderivative. I'd assume it would be inverse tangent X -13. Am I correct? 2) (1 pt) Given that the graph of f(x) pass...
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Inner product of linear bounded operators between Hilbert spaces up vote 1 down vote favorite Let $X$ and $Y$ be Hilbert spaces, and let $L(X,Y)$ be the set of bounded linear operators between Hilbert spaces. Can we equip $L(X,Y)$ with a natural inner product? I think it should look like $\langle S, T \rangle = \sup...
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Converting mW to dB Date: 06/14/2001 at 21:45:44 From: Jeff Carson Subject: Conversion of mW to dB I this equation during a radio receiver discussion. 4x10-12mW = -114dBm How does it equate? What is the math that performs this conversion? Date: 06/15/2001 at 12:04:22 From: Doctor Peterson Subject: Re: Conversion...
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Lagrange Multiplier March 29th 2009, 07:25 AM #1 Member Joined Nov 2007 Posts 232 Lagrange Multiplier See attach for the question. My answer is incorrect. Where did I go wrong? $V = x^2y = 900$ $SA = 6xy$ $f_x = 6y$ $f_y = 6x$ $g_x = 2xy$ $g_y = x^2$ $6x = 2xy \lambda$ ...
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Ratio of areas of similar figures January 20th 2011, 03:05 AM #1 Junior Member Joined Feb 2010 Posts 34 Ratio of areas of similar figures Hi all, Here goes the question: In the diagram, AC,RQ and BP are parallel lines. AR=9cm,RQ=6cm,BP=8cm, and RB=3cm. Calculate the ratio of: (i)area of...
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Gonality, the Bogomolov property, and Habegger's theorem on Q(E^tors) Gonality, the Bogomolov property, and Habegger’s theorem on Q(E^tors) I promised to say a little more about why I think the result of Habegger’s recent paper, ” Small Height and Infinite Non-Abelian Extensions,” is so cool. First of all:  we say an...
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Homomorphisms preserving constant functions MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. Assume we have a homomorphism $\phi: C(S^{1},M_{n}(\mathbb{C}))\rightarrow C(S^{1},M_{m}(\mathbb{C}))$ where $n$ divides $m$. Under ...
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Game involving 'asking questions about a real' up vote 24 down vote favorite 8 Consider the following game, played by two players, called Q and A, in a time frame t = 1, 2, .... At every time point i, Q mentions some $Q_i \subset \mathbb{R}$, after which A mentions $A_i$ such that either $A_i = Q_i$ or $A_i = Q_i^c$. ...
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Two [n] to [n] function families up vote 7 down vote favorite 5 $\bf Note.$ This question had a bounty, so at the end I accepted the best (and only) answer but in fact it is still open. It is (hopefully) equivalent to this question, if you have any ideas, please post them there. $\bf Question.$ Fix n. We are interest...
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A limit to Shoenfield Absoluteness up vote 12 down vote favorite 4 Shoenfield's Absoluteness Theorem states that if $\phi$ is any $\Sigma^1_2$ sentence of second-order arithmetic, then $\phi$ is absolute between any two models of $ZF$ which share the same ordinals. This means that such $\phi$ are unaffected by forcing...
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Complex Analysis, harmonic functions December 18th 2006, 09:09 AM taypez Complex Analysis, harmonic functions Here is the problem: If f= u+ iv is analytic in a region, show that uv is harmonic in the region but that u^2 need not be harmonic. Thanks December 18th 2006, 10:26 AM ThePerfectHacker ...
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Expressing a number field as a composite of extensions ramified at one place up vote 13 down vote favorite 8 If $K$ is a number field, is it always possible to find a finite extension $L/K$ such that $L$ is the composite of fields $L_1,\ldots, L_n$, with the property that at most one prime ramifies in $L_i/ \mathbb{Q}...
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CG Hausdorff space up vote 1 down vote favorite Let X be in CGHaus and Y locally compact hausdorff. The usual product space XxY is CGHaus, so we dont need to apply that special functor to it (the one that takes a space to the space with same points and the strongest topology induced by its compact subsets). Is the rig...
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volume of solid using double integrals hi again Find the volume of the given soild: Bounded by the cylinders x^2+y^2=r^2 and y^2+z^2=r^2. thanks you only need to find the volume of the solid in the first octant and then multiply the result by 8 to get the full volume. so you have $z=\sqrt{r^2 - y^2}$ and you need to i...
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Complex Trignometric Functions The question Express tan(1 - i) in the form a + ib, for a and b real My attempt I used the fact that: sin(z) = sin(x)cosh(y) + icos(x)sinh(y) cos(z) = cos(x)cosh(y) - isin(x)cosh(y) I substituded these into tan(z) = \frac{sin(z)}{cos(z)}, and after quite a b...
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xn + ym is a Cauchy sequence October 7th 2010, 05:35 PM #1 Senior Member Joined Apr 2008 From Vermont Posts 318 xn + ym is a Cauchy sequence Let xn and yn be Cauchy sequences. Give a direct arguement that xn+yn is a Cauchy sequence that does not use the Cauchy Criterion or the Algebraic Limit The...
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Another Related Rates March 12th 2008, 05:55 PM #1 Junior Member Joined Mar 2008 Posts 30 Another Related Rates A 100ft. long cable of diameter 4 inches is submerged in seawater. Due to corrosion, the surface area of the cable decreases at a rate of 750 in^2 / year. Ignoring the corrosion at the ends of ...
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Elliptic curves over finite fields and 2x2 matrices up vote 5 down vote favorite 1 Let $k$ be a finite field of order $p^a$ and characteristic $p$, and $\mathcal{C}$ a $k$ isogeny class of elliptic curves over $k$. Let $w$ be the (Galois conjugacy class of the) Weil $k$-number attached to $\mathcal{C}$, and let $f(x)\...
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Expectation of first positive value in random walk up vote 6 down vote favorite 1 Let $p$ be a parameter in $]0,1[$. Let $(X_k)_{k\geq 0}$ be an independent, identically distributed sequence of random variables, such that each $X_k$ takes values only in $\lbrace -1, \frac{1-p}{p} \rbrace$ and $P(X_k=-1)=1-p$ (so that ...
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How good is Kamenetsky's formula for the number of digits in n-factorial? up vote 14 down vote favorite 2 In Number of digits in n!, now closed, there was a mention of Dmitry Kamenetsky's formula, $[\bigl(\log(2\pi n)/2+n(\log n-\log e)\bigr)/\log 10]+1$, for the number of decimal digits in $n$-factorial. Here, $[x]$ ...
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Prove: Interior is an open set February 20th 2010, 12:45 AM kingwinner Prove: Interior is an open set Let (X,d) be a metric space and let F be a subset of X. B(r,x) is the open ball of radius r about x. Definition: The interior of F, int(F), is the set of all x E F such that there is an r > 0 such that B(r,x...
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Does the classifying space of monoids commute with wedge sum up to weak equivalence? up vote 4 down vote favorite 2 If $G$ and $H$ are groups, then the map $BG\vee BH\to B(G\ast H)$ is a weak equivalence by van Kampen's theorem. However the classifying space $BM$ of a monoid can have arbitrary homotopy type so higher ...
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principal vaue of a complex number December 18th 2010, 02:05 AM #1 Newbie Joined Dec 2010 Posts 12 principal vaue of a complex number I strugged for half an hour trying to find materials for this problem. $(3+j4)^{1+2j}$ could you lead me to a good study material for this topic ? thanks ...
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really hard fraction question HELP December 18th 2009, 06:57 AM #1 Super Member Joined Oct 2008 From Bristol, England Posts 897 really hard fraction question HELP $\frac{8}{2 - \sqrt{2}}$ is this right, $\frac{8}{2 - \sqrt{2}} X \frac{2 + \sqrt{2}}{2 + \sqrt{2}}$ = 16+ $8\sqrt{2}$, as the numera...
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Piecewise linear dynamic systems with time delays Kim, Byung-Koo (1972) Piecewise linear dynamic systems with time delays. California Institute of Technology . (Unpublished) http://resolver.caltech.edu/CaltechEERL:1972.DYNL-106 PDF (Adobe PDF (6 MB)) See Usage Policy. 5Mb Use this Persistent URL to link to this...
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General Expression for Partial Fractions Date: 02/09/99 at 04:01:38 From: TOMMY Subject: Partial fractions Could you please tell me the general algorithm to convert an expression into partial fraction form? Thank you! Date: 02/09/99 at 10:56:56 From: Doctor Rob Subject: Re: Partial fractions Thanks for writing t...
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I can't troubleshoot this March 18th 2010, 05:50 PM #1 Junior Member Joined Dec 2009 From U.S Posts 60 I can't troubleshoot this I'm trying to solve for the coordinate that is 1/3 of the way between point (1,7) and point (10,4) USING the distance formula. This is what I had but I am stuck. ...
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Simplification! June 9th 2008, 02:36 PM #1 Newbie Joined Sep 2007 Posts 11 I was wondering If i would be able to get help with these last questions: a) Prove by showing all steps of working that 3^(x+2)+27 / 5 x 3^x + 15 can be simplified to 9 / 5 a) p ( x) = ax^3 + bx^2 - 5x + c is a polynomial...
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trigo and log equation I will try let $t=\pi (ln(x^2))$ [tex]sint + cost = 1 [tex] $2sin(t)cos(t) + 1 - 2sin^2(t) = 1$ $2sin(t)(cos(t) - sin(t)) = 0$ $sint=0........ln(x^2)=0.....x=\pm 1$ $sint=cost....t=\frac{\pi}{4} + 2\ pi n .....$ $\pi ln(x^2)=\pi ( \frac{1}{4} + 2n )$ $ln(x^2)= \frac{1}{4} + 2n$ $x^2 = e^{.75 + 2n...
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Finite Math Hw question very frustrating October 5th 2011, 02:07 PM #1 Newbie Joined Oct 2011 Posts 3 I understand how to use A=P(1+rt) and also the compound interest formula, but I have been stuck on this problem for 2 days and dont know how to put it in the formula. Im pretty sure you have to use th...
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Surface Integrals help November 29th 2008, 07:45 PM nathanfsu Surface Integrals help Hi, I'm having a little trouble to solve these problems. May anyone help me please? What is the area of the spherical surface X^2+Y^2+Z^2=9 inside the cylinder X^2+Y^2=3x ? What is the area of the spherical surface...
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Error In Problem Creation? May 13th 2012, 12:11 PM #1 Member Joined May 2011 Posts 178 Thanks 6 Related Rates Problem The problem is as follows: A conical tank with its vertex down is 12 ft high and 12 ft in diameter at the top. Water is being pumped in at the rae of 4 cubic feet per minute. Fin...
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Weighted Regular Graphs up vote 8 down vote favorite 2 The following graph theoretic notion appeared in an economics paper entitled: "Prize competition under limited comparability, by Michele Piccione and Ran Spiegler which studies models of economics were the firms are rational but the consumers are not. A graph is ...
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Volume inequality between projections of a convex symmetric set in $\mathbb R^3$ up vote 6 down vote favorite 1 Let $K$ be a centrally symmetric convex body in $\mathbb R^3$ with volume ${\rm vol}(K)=1$. For any subset $F \subset \lbrace1,2,3\rbrace$, let $K_F$ be the projection of $K$ in $\mathbb R^F$. Question:...
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Borel Group on R up vote 2 down vote favorite Last week in class we used the fact that if we have a group within R which is also a Borel Set, then it is either R or meagre. Why is it so? Can you direct me to a proof? measure-theory gr.group-theory closed as off topic by Bill Johnson, Andres Caicedo, Qiaochu Yuan, ...
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College Algebra With Trigonometry 9th Edition Textbook Solutions | Chegg.com Question: If a, b, and c are real numbers with a ≠ 0, then the quadratic equation ax2 + bx2 + c = 0 can be solved by a variety of methods, including the quadratic formula. How can we solve the cubic equation and is there a formula for the r...
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