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3D Geometry Date: 11/17/97 at 10:10:54 From: Tim Fallon Subject: 3d geometry Given two lines in 3space, you can draw a line of minimum distance between the two. This line will be perpendicular to both lines. I know how to get the distance and direction of this line, but I want to locate the line in 3space so that I ...
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Dividing 29/49 Date: 08/30/97 at 12:31:03 From: Fredericks Subject: Division help I need to divide 29/49 out until it repeats itself or terminates. I also need to do 30/49, 31/49, 32/49, 33/49, 34/49, 35/49. Is there a way to figure these problems out without doing them by long division? Thank you! Date: 09/04/97...
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Lesson 6: The Halting Problem Previous Lesson | Next Lesson Last lesson we learned about using reductions to show problems are hard. Now consider the most famous of undecidable problems, the halting problem: L[H] = {<M> | <M> eventually halts with b...
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Value of 9^(9^9)? Date: 10/21/2002 at 20:59:03 From: Stephen W. Subject: Value of 9^(9^9)? A kid in my class came in one day and asked my teacher, "What is the largest possible number that can be made with 3 digits?" I answered 9 to the 9 to the 9. I was correct. Today the teacher asked me to figure out 9 to the 9 t...
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Equation of a Triangle An ellipse can be expressed as the locus of points with orthogonal coordinates (x,y) such that (x/a)^2 + (y/b)^2 = 1 for some constants a,b.  However, it's more difficult to give a succinct description of a piece-wise linear curve, e.g., a triangle.  We seek a function f() such that f(x,y) = 0 i...
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Combinatorics November 24th 2008, 05:13 PM #1 Junior Member Joined Nov 2008 Posts 53 Combinatorics 27. a) In how many ways can a committee of 3 be chosen from an organization with 12 members? My answer: Number of Ways (12 3) = 220 ways b) In how many ways can a president, vice-president, and tr...
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AS.AQA.Page.220.Revision Exercise.Q8.Q19.Trigonometry. March 16th 2010, 10:41 AM #1 Junior Member Joined Nov 2009 Posts 28 AS.AQA.Page.220.Revision Exercise.Q8.Q19.Trigonometry. Q8. a)i)Express in sin^2 x in terms of cosX. ii) By writing cosX=Y show that the equation 7cosX + 2 - 4 sin^2 x = 0 is ...
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Using elementary taylor series for taylor polynomial April 3rd 2008, 01:50 PM emttim84 Using elementary taylor series for taylor polynomial Ok, so the problem is to use a sixth-degree Taylor polynomial centered at c for the function f to obtain the required approximation. Here's the info: Function: $f(x)=x^...
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Is there any way to find arithmetic mean "better" than sum()/N? up vote 13 down vote favorite 7 Suppose we have N numbers(integers, floats, whatever you want) and want to find their arithmetic mean. Simplest method is to sum all values and divide by number of values: def simple_mean(array[N]): # pseudocode sum = ...
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Addition Formula question expressing function in terms of Rsin(a+b) June 4th 2011, 03:16 AM #1 Newbie Joined May 2011 Posts 23 Addition Formula question expressing function in terms of Rsin(a+b) I don't know where I'm going wrong. The answer at the end is supposed to be "tan a= 3/4" but going through it ...
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Building a Manger Date: 12/03/2001 at 22:39:44 From: Anne Markle Subject: Angles for a building I am building a manger with a base of 11" (A), one wall 7 1/2" high (B) and the other wall 6" high (C). Both walls meet the base at 90-degree angles. My question is: What would the length of my roof be and what would be ...
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Confused about multiplication rule. October 7th 2008, 01:38 PM #1 Newbie Joined Oct 2008 Posts 2 Confused about multiplication rule. Here is the problem I have... A certain virus infects one in every 400 people. A test used to detect the virus in a person is positive 92% of the time if the person ha...
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Another limit question lim as h -> 0 (6 + h) to the power of 3 subtract 216 divided by h Any help? You can expand $(6+h)^3$ or take advantage of property $a^3-b^3=(a-b)(a^2+ab+b^2)$ on numerator. This is apparently $\lim_{h \to 0} \frac{(6 + h)^3 - 216}{h}$ Expand the cubic: $= \lim_{h \to 0} \frac{(216 + 108h + 18h^...
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[SOLVED] Checking Inequalities April 12th 2010, 11:22 AM #1 Newbie Joined Apr 2010 Posts 3 [SOLVED] Checking Inequalities Sorry I'm quite bad at maths, but wanted to find out a) 4^(x - 1) + 0.5 = (3/4).2^x and b) 4/(x - 6) > 5 thanks The first one is an equation, not an inequalit...
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Numerically integrating a non-linear DE May 3rd 2010, 02:23 AM #1 Junior Member Joined Apr 2010 Posts 26 Numerically integrating a non-linear DE Given a DE $y'=f(t,y), \: t>0$ for a function $y(t)$ with IC $y(0)=y_0$. We have the numerical integration method $w_{n+1}=w_n+hf(t_n+\alpha h,w_n + \alpha...
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Money Math-Trick Question August 13th 2011, 01:25 PM KayPee Money Math-Trick Question Kane has $50.00. He goes to the supermarket and buys football boots and then he buys a soccer ball, which is half the price of the football boots.He then spends half of what she has left on a belt, leaving him with $15.00. ...
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[SOLVED] Geometric Interpretation January 22nd 2008, 04:25 PM #1 [SOLVED] Geometric Interpretation I suppose this might fall under the heading of Pre-Calc, but since I got it out of a book on Complex Analysis I thought I'd put it here. The problem is this: Prove the identity: $|z_1 + z_2| ^2 + |z_1 ...
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HCF and Dividing Numbers November 10th 2007, 02:23 PM #1 Junior Member Joined Oct 2007 From Bath, UK Posts 25 HCF and Dividing Numbers Prove that xa+yb=c has integer solution x, y iff hcf(a,b)|c. I have to prove this both ways, because of the iff statement. So first, I let d = hcf(a,b) and assum...
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Triangle hydrostatic force! June 24th 2008, 02:03 PM #1 Member Joined Jun 2008 Posts 87 Triangle hydrostatic force! A triangular plate with height 4 ft and a base of 5 ft is submerged vertically in water so that the top is 2 ft below the surface. Express the hydrostatic force against one side of the plat...
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Writting Linear Functional as Direct Sum. February 28th 2010, 01:57 AM #1 Linear Functionals and Direct Sums. Hi everyone Sorry about the goofy thread title, it should read "Linear Functionals and Direct Sums". Let $V$ be a finite-dimensional vector space over the field of scalars $F$, and $T$ a linear ...
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Proof with transpose - I think this is right March 14th 2011, 02:32 PM #1 Member Joined Oct 2009 Posts 128 Proof with transpose - I think this is right Hello everyone. I've got a proof done. May someone please just do a scan of the proof to see if it's correct? Prove: $(AB)^T$ is nonsingular ...
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L'Hospital's Rule Square Root Problem November 9th 2012, 02:41 PM Jason76 L'Hospital's Rule Square Root Problem Find the limit as x approaches 1. Step 1) Plug in 1 into x. $\frac{x - 1}{\sqrt{x^{2} + 3} - 2}$ This come out to being indeterminate or 0/0. So taking the rule: Step 2). ...
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[SOLVED] algebra how do you solve 1/x=1/t + 1/r ?? and -4<2 (x-3)< 8 dyr Hello, to 1.: You need a common denominator (which is here r*t): $\frac{1}{x}=\frac{r+t}{r \cdot t}\ \Rightarrow \ x=\frac{r \cdot t}{r+t}$ to 2.: Split the inequalities into two single inequalities: $-4<2 (x-3)< 8\ \Leftrightarrow \ -4<2(x-3)\ \...
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Please, could someone help me with this Optimization problem? What is the largest possible area for a triangle whose hypotenuse is 5cm. long? Re: Please, could someone help me with this Optimization problem? Since it has a hypotenuse, we'll assume that it's right-angled. Call the base of the triangle \displaystyle \b...
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Divergence Theorem, vector fields .......... Let me try... First we need to find, $\mbox{div} \b{F}=2x-1$ And $S$ is a box. Thus, $\int_0^3 \int_0^1 \int_0^2 2x-1 dz\, dy\, dx$ Thus, $\int_0^3 \int_0^1 4x-2 dy\, dx$ Thus, $\int_0^3 4x-2 dx$ Thus, $2(3)^2=18$ Question 2] You are given, $\b{V}=<e^x\cos y,-e^x\sin y,0>$ ...
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Just another integration problem November 21st 2006, 03:19 AM taryn Just another integration problem integral (x^6)ln(x)dx The thing is... I have the exam in 2 days and this is the main thing I am havin problems with! I tried makin u=x^6 and then integratin by parts which didnt seem to work! I...
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Rotation of a triangle February 17th 2014, 06:41 AM #1 Newbie Joined Feb 2014 From England Posts 24 Rotation of a triangle A triangle has vertices at the points A(−6, 9), B(6, 3) and C(9,−6). Suppose that the triangle is to be moved so that B is at the origin and BC lies along the...
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equation of the normal line at a given point September 28th 2013, 03:57 PM Jonroberts74 equation of the normal line at a given point I am not getting the same answer as the book for this question. it is to find the equation of the normal line at the given point y = 2x^(3) + x^(-3) where x = -1 I solved...
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Find the standard matrix of an orthogonal projection April 22nd 2010, 11:27 PM #1 Newbie Joined Apr 2010 Posts 6 Find the standard matrix of an orthogonal projection Problem 4. Let W = Span[w1; w2], where w1 = [3 0 4] w2 = [4 5 -3] If T (from R^3 to R^3) is the orthogonal projection onto W, ...
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Help with ideal proof October 27th 2006, 07:35 AM BenWong Help with ideal proof Yo. New to the board. Just looking for some help. Let F be a field. Prove that the ring M2(F) of 2 x 2 matrices with entries in F has no non-trivial ideals. That is, every ideal is either the zero ideal or M2(F) itself. Any...
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MGF Problem May 19th 2008, 12:44 PM statsnewbie MGF Problem Hi Can someone help with the pointing me in right direction with the following "Use the MGF to compute the mean and variance of the distribution of x which has the following probability distribution f(x) = x+1/14 if x=1,2,3,4 Many th...
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Rank and Nullity of a linear transformation June 28th 2009, 01:51 PM meg0529 Rank and Nullity of a linear transformation Okay so i have been breaking my head over this for a couple of hours but don't really know if I'm even doing the right thing. Okay so we are looking at a transformation defined in the fol...
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MacClaurin series discrepancy May 7th 2009, 01:17 PM redsoxfan325 MacClaurin series discrepancy This can happen with a bunch of different series, but let's just look at a really easy one as an example. $f(x)=e^{x+1}$ There are two ways to calculate the Maclaurin polynomial: 1.) $e^x = \sum_{n=0}^{...
5
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Finding minimum of average cost January 7th 2011, 01:32 PM #1 Junior Member Joined Dec 2010 Posts 26 A company has found that the total cost T(q) $ for product of q boxes can be calculated as: T(q)=0.01q^2-2q+5000 , q>0 How many box has to be produced to the average cost of A(q)=T(q)/q become as l...
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Math B regents May 13th 2007, 01:26 PM #1 Junior Member Joined Nov 2006 Posts 73 Math B regents I'm doing some practice regents to prepare for the test and i got stuck on a couple problems. Here's the link to the problems:http://www.nysedregents.org/testing/...hbtestja05.pdf and here's the link to t...
4
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Automorphisms April 22nd 2009, 10:03 PM #1 Junior Member Joined Apr 2009 Posts 36 Automorphisms Let a,b be automorphisms of G, and let ab be the product of a and b as mappings on G. Prove that ab is an automorphism of G, and that the inverse of a is an automorphism of G, so that the set of all automo...
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Steaks in sports: calculating the expected number of streaks October 20th 2012, 07:28 PM #1 Newbie Joined Sep 2012 From US Posts 18 Steaks in sports: calculating the expected number of streaks Having some trouble with the material, so I just wanted to double check this question. A basketball pla...
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asimptotic value of height of binary tree November 20th 2011, 12:30 AM transgalactic asimptotic value of height of binary tree prove that height of a binary tree with n leaves is $\Omega(log_{2}n)$ ? at level 0 we have 1 leaf at level 1 we have 2 leaves etc.. $2^{0}+2^{1}+2^{2}+..+2^{x}=n$ ...
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undetermined coefficients help May 11th 2011, 08:17 PM #1 Junior Member Joined Oct 2009 Posts 48 undetermined coefficients help Can someone tell me if this is right? if it isnt, tell me what is wrong. Im lost on creating the correct complimentary and particular solutions.. 1. $y'' - 2y' +5y = e^x\co...
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Tenenbaum and Pollard, Problem 2.10.6 March 2nd 2011, 04:25 PM #1 Tenenbaum and Pollard, Problem 2.10.6 Problem 2.10.6 Test the following DE for exactness. If it is not exact, try to find an integrating factor. After the equation is made exact, solve by looking for integrable combinations. If you cannot find ...
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Holomorphic extension of Dirichlet Series April 7th 2010, 03:52 AM #1 Member Joined Nov 2009 Posts 169 Holomorphic extension of Dirichlet Series Define $L : \{s \in \mathbb{C}| Re(s) > 0\} \rightarrow \mathbb{C}$ by $L(s) = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)^s}$. Note that $L(s) = \frac{1}{\Gamm...
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embarrasing algebra question February 9th 2010, 04:58 AM #1 embarrasing algebra question Hi, In my calculus book i have the following limit problem: $\lim_{x\to \infty}~\bigg(1+sin\frac{3}{x}\bigg)^x$ The first part of the solution: 1.Take the log of both sides: $ln~y = \lim_{x\to \infty}...
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In F# Major This post is further enhancement of my suggestion on Stack Overflow upon an approach to solving the following problem: how to limit output to F# Interactive window to just user’s own? At first I thought that such mode doesn’t make sense as FSI outputs gazillion of useful bits and pieces, but on further con...
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Previous Yes, the beetles will meet! Even if D[0] were 8 cm (one ladybug on the pole, the other on the cannonball), the change is thus: Sec. Band Length Bugs Gap 1) D[1] = 16 [cm]; A[1] = 12 [cm] 2) D[2] = 24 [cm]; A[2] = 15 [cm] 3) D[3] = 32 [cm]; A[3] = 17 1/3 [cm] 4) ...
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Level Curves question January 31st 2010, 08:27 AM Penguin91 Level Curves question I have a question asking me to describe the level curves for the following functions f(x,y) = x^2 + 2y^2 - 3x= 0 and f(x,y) = -6 How do I go about doing this, for the second case, would the level curve be just a line...
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A simple infinite dimensional optimization problem up vote 2 down vote favorite I'd be grateful for a reference for the following result, which I believe to be true, and should be well-known. Let the continuous functions $f_0,f_1,\cdots,f_n: [0,1]\rightarrow [0,\infty)$ be given and consider the problem of maximizing...
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logarithms solve the eqn: 1/log(base 4) (x+1)/(x+2) < 1/log(base 4) (x+3) Hello, grgrsanjay! I already solved this somewhere . . . Here is it again. Solve: . $\dfrac{1}{\log_4\left(\frac{x+1}{x+2}\right)} \;<\; \dfrac{1}{\log_4(x+3)}\;\;[1]$ Note that the domain is: . $x > -1$ For $x > -1,$ . $\dfrac{x+1}{x+2} \:<\:1$...
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trivial topology in domain April 3rd 2009, 10:21 AM Andreamet trivial topology in domain Correction to title: Trivial topology in RANGE Let Y ave the trivial topology and X be an arbitrary topological space. Show that every function f: X->Y is continuous April 3rd 2009, 10:55 AM robeuler Quote: ...
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Math Help May 21st 2011, 06:39 PM #1 Newbie Joined Sep 2007 Posts 22 finite series Ahoy all late nighters. looking for a some clarity on a problem I have. Please go easy. Im sure to screw something up when writing this. Ok so heres the problem as I know it. It is an algorithm with the following beh...
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help with ellipse equation July 8th 2007, 11:17 PM #1 Newbie Joined Jul 2007 Posts 2 help with ellipse equation Hi, I've got an ellipse defined by a central (steep) radius of curvature (R0) and a p-value (shape factor) that is p=1-e^2 I've derived most of the formulas I need for calculating the l...
4
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Calculate X in a circle July 7th 2012, 04:45 AM gingerale Calculate X in a circle I'm having some difficulties trying to solve this problem seen in the picture below. I just don't know where to begin. Any help would be very appreciated, thanks. Calculate the angel X in the circle http://img854.imagesha...
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Finding the Exponent with a Modulus Date: 05/24/2003 at 11:40:24 From: Sarah Subject: Finding the exponent with a modulus I am trying to work out k in the following question : 23^k = 201545 (mod 900001) I have taken the natural log of both sides k . ln23 = ln201545 (mod 900001) k = ln 201545 / ln 23 (mod 900001...
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Central Measures of Central Tendency Measures of central tendency indicate the typical or average score in a distribution of scores. There are three measures of central tendency that will be covered in this section: the mean, median, ...
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Geometric Progression September 10th 2009, 09:22 AM #1 Newbie Joined Sep 2009 Posts 3 Geometric Progression Hi guys, I am a little stuck on where to begin here and any help would be great. This is the question I am faced with: Now, the formula I have been using recently for working out the...
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Solve the inequality 20-3y > y+4 September 19th 2011, 03:26 AM #1 Member Joined Jan 2011 Posts 104 Solve the inequality 20-3y > y+4 I am not sure of my workings but here it is: $20-3y = y+4$ $20-4 = y+3y$ $16=4y$ $y=4$ Therefore, $y>4$ Also, how do I illustrate the answer on a ...
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Integral problem June 13th 2008, 02:08 PM #1 Newbie Joined Jun 2008 Posts 14 Integral problem The velocity v at time t of an object travelling in a straight line is given by v = t - 3. Determine the distance it travels from t = 0 and t = 4. $\frac{dx}{dt} = t - 3 \Rightarrow x = \frac{t^2}{2} - 3t +...
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Finding the value of a square root May 7th 2011, 06:12 AM dumluck Finding the value of a square root What would be the quickest method to estimate (i.e to the nearest integer) the value of $3\sqrt{-89}$? If 89 has a factor of 3 it wouldn't be too bad but given that its a prime this question seems a little d...
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Coordinate geometry: tangent to two circles January 27th 2010, 03:22 AM #1 Newbie Joined Jan 2010 Posts 2 Coordinate geometry: tangent to two circles consider two circles of radius r1 and r2, centres (x1, y1) and (x2, y2). there are two lines that are tangents to BOTH these circles that DON' T cross the ...
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When is an algebraic variety $\mathbb{Q}$-factorial? up vote 7 down vote favorite 3 A variety is $\mathbb{Q}$-factorial if every global Weil divisor is $\mathbb{Q}$-Cartier. How bad singularities are allowed so that the algebraic variety is still $\mathbb{Q}$-factorial? Is a singular curve $\mathbb{Q}$-factorial? For ...
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Find the point on the parabola y = x^2 + 3 that is closest to the point (1,5) We want to minimize the distance $D$ between $(x, x^2+3)$ and $(1,5)$. We know that $D = \sqrt{(x-1)^2 + (x^2 + 3 - 5)^2} = \sqrt{2x^2 - 6x + 5}$ To make things easier, $D^2 = 2x^2 - 6x + 5$. To find the x that minimizes $D$, you may as well...
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Find Centre of symmetry of conic February 1st 2013, 05:24 PM mcleja Find Centre of symmetry of conic I have the following conic and i want to find its centre of symmetry: 3y^2+2x+18y=-31 I tried the following way but it didn't seem to work, could somebody tell me where i went wrong? (3y^2+18y)+2x=-31 ...
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Area and Perimeter of Shaded Region (Answer Confirmation) August 17th 2010, 04:52 AM #1 Member Joined Jun 2010 Posts 111 Area and Perimeter of Shaded Region (Answer Confirmation) In attachment there are 8 question and i want to confirm my answers Q1)Area(Shaded)=41 Perimeter(Shaded)=25 Q2)...
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Is there a closed form for the characteristic polynomial of the graph cycle (of n edges and n summits) ? up vote 0 down vote favorite Is there a closed form for the characteristic polynomial of the graph cycle (of $n$ edges and $n$ summits)? I know it for the graph path (it is a Chebyschev polynomial), but I couldn'...
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Garden Areas Date: 8/14/96 at 13:51:21 From: Anonymous Subject: Algebra Word Problems Dear Dr. Math, I am an English teacher you have helped before. I hope you can help me again. I am on the chapter involving factoring and the zero product property. Here is a word problem with which I am having a difficult time: O...
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The Best (Spill-free) Coffe Cup is Elliptic Linear Sloshing The movement of a non-rotating, incompressible sloshing liquid in a cylindric vessel is described by a velocity potential obeying Laplace's equation. The time dependency creeps in through the free surface boundary condition, something I can't get my head aro...
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Area and Arc Length in Polar Coordinates October 5th 2012, 12:11 AM TWN Area and Arc Length in Polar Coordinates I'm teaching myself calculus and I can't figure out how to do the problems below. Please explain how to do them because my book is confusing me. Find the area of the region: 1.) Inside r = 2...
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Basic Probability Problem August 31st 2010, 11:01 AM #1 Junior Member Joined Mar 2009 Posts 41 Basic Probability Problem A box contains four 40-W bulbs, five 60-W bulbs, and six 75-W bulbs. If bulbs are selected one by one in random order (without replacement), what is the probability that at least two b...
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Infinite product May 8th 2010, 09:27 AM Dinkydoe Infinite product A part of my course complex-analysis we deal with infinite products. And as a homework assignment I got the following exercise. If $b_n>1$ for all $n$, then prove that $\prod_n b_n$ converges iff $\sum_{n}\log(b_n) < \infty$ I'm used to ...
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Show that 1 is a positive number ,.,can anyone please show me the proof of this??i was really confused in my teachers proof,.,thnx Re: Show that 1 is a positive number Please state a definition of "positive number". Talk us through your teacher's proof. Re: Show that 1 is a positive number haha......
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Period of sums/multiplied sines/cosines July 10th 2011, 01:10 AM gabber808 Period of sums/multiplied sines/cosines Hello I am trying to revise some rules regarding the period of sines (or cosines) when (a) they are added , and (b) they are multiplied. I haven't had too much luck Googling this topic. Fo...
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Evaluating indefinite Integral November 26th 2012, 05:38 PM kspkido Evaluating indefinite Integral Could someone please work me out in these problem, I did a substitution on Ln(x) but ended up with (u^2+1)/(u+1)... here is the question find the indefinite integral of ((ln x)^2+1)/(xln(x)+3).... November 26t...
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Finding Derivatives September 23rd 2009, 05:31 PM #1 Finding Derivatives Find the derivative: $\frac{dv}{dt}$ if $v=t-\frac{1}{t}$ My answer is $-\frac{2}{t}$ I can show work later if needed if this is wrong. Just need to be sure I did this one right before I go on and do others. dv/dt = 1 + 1...
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Linear Correlation Linear Correlation Coefficient Correlation coefficients measure the strength of association between two variables. The most common correlation coefficient, called the Pearson product-moment correlation coefficient, measures the strength of the linear association between variables. In this tutorial,...
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order of an element of a group April 29th 2010, 02:17 PM #1 Newbie Joined Feb 2010 From Bangladesh Posts 10 order of an element of a group I need the Proof: a, b are two elements of a group G such that ab=ba. If o(a)=m & o(b)=n and m,n are relatively prime to each other,then o(ab)=mn. ...
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hcf's and lcm's January 2nd 2009, 12:32 PM #1 hcf's and lcm's Let $q_1=\frac{m_1}{n_1}$ and $q_2= \frac{m_2}{n_2}$ be positive rational numbers. We define the lowest common multiple of $q_1$ and $q_2$, lcm $(q_1,q_2)$, to be the smallest positive rational number q such that $q=Mq_1=Nq_2$ for some positive int...
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Prove that sets are denumerable June 28th 2010, 03:48 AM #1 Junior Member Joined Jun 2010 Posts 32 Prove that sets are denumerable Hi! Problem: Prove that the sets $\mathbb{N} \times \mathbb{N} = \left\{ (i,j): i,j \in \mathbb{N} \right\}$ and $\mathbb{Q}$ are denumerable. (If someone want...
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[SciPy-User] raising a matrix to float power David Goldsmith d.l.goldsmith@gmail.... Sun Jul 11 12:23:20 CDT 2010 On Sun, Jul 11, 2010 at 8:26 AM, Andrew Jaffe <a.h.jaffe@gmail.com> wrote: > Hi, > > On 11/07/2010 00:26, Alexey Brazhe wrote: > > Hi, > > I failed to find a way to raise a matrix to a non-integer power ...
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Complex structure on $L^2(\mathbb R)$ generalizing the Hilbert transform. up vote 15 down vote favorite 8 The Hilbert transform on the real Hilbert space $L^2(\mathbb R)$ is the singular integral operator $$ \mathcal H(f)(x) := \frac{1}{\pi} \int_{-\infty}^\infty \frac{1}{x-y} f(y) dy. $$ It satisfies $\mathcal H^2=-...
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I have problems of understanding two statistical concepts July 2nd 2010, 01:19 AM #1 Junior Member Joined Apr 2010 Posts 56 I have problems of understanding two statistical concepts The followings are the definitions of Law of Iterated Expectations and Covariance from textbook. Law of Iterated Expec...
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What is the localization of Q[x]/(x) at 0 up vote 1 down vote favorite 1 Q is a rational field. Q[x] is polynomial ring over Q 。(x) is maximal ideal of Q[x]. Take Q[x]/(x) as a module over Q[x]. Then what is Q[x]-module Q[x]/(x) localize at 0?? I think the result is Q[x]/(x) \ otimes_{Q[x]}Q(x) but on the other hand,...
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Prove the perpendicular bisector of a chord passes through center May 1st 2012, 02:35 PM Ragnarok Prove the perpendicular bisector of a chord passes through center Hello, I need some help again. I need an algebraic proof of this theorem: The perpendicular bisector of a chord of a circle passes through the c...
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What is Z-Score? - Baltimore Sports and Life What is Z-Score? How do you rank the best players in any sport? With so many variables involved, players who excel in different areas of the game, players at different positions, it’s hard to tell. In baseball, do you value hitters over pitchers? Maybe pitchers more than hi...
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Finding the inverse of a matrix May 5th 2011, 04:24 AM #1 Member Joined Jul 2008 Posts 212 Finding the inverse of a matrix So I'm trying to find the inverse of the matrix: [2 4 2] [2 5 2] [0 2 -1] I've gotten up to this bit: [1 0 5 | -1/2 -2 0] [0 1 -2| 1/2 1 0] [0 0 -3| 1 ...
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Integral test December 24th 2008, 09:21 PM #1 Integral test Hello everyone! While doing some problems I came upon this one. What is disconcerting is that I have found (in general) that the more useful a theorem is the more difficult it is to prove. So I would appreciate if someone would tell me if this looks ...
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How to deduce (8.1) in Lusztig's "Equivariant K-theory and representations of Hecke Algebras" up vote 3 down vote favorite Let G be a connected complex algebraic group G and X=G/B, where B is the Borel subgroup. $ M=G\times C^{*}$, where $C^*$ acts on X trivially. Let $K_M(X)$ be the equivariant K-theory. Let $s\in S$...
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Sinusoidal function help June 19th 2010, 11:53 AM #1 Newbie Joined Jun 2010 Posts 1 Sinusoidal function help A small windmill has its center 10 meters above the ground and blades 4 meters in length. In a steady wind, a point P at the tip of one blade makes a rotation in 24 seconds. If the rotation b...
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Nyquist Plot Examples What follows are several examples of Nyquist plots. In general each example has five sections: 1) A definition of the loop gain, 2) A Nyquist plot made by the NyquistGui program, 3) a Nyquist plot made by Matlab, 4) A discussion of the plots and system stability, and 5) a video of the output of t...
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Prove That -(-a) = a Date: 09/11/2001 at 22:21:28 From: Eduardo Subject: Why does - (-a) = a Why does -(-a) = a? How do you prove this using the properties of real numbers? Date: 09/12/2001 at 08:26:08 From: Doctor Rick Subject: Re: Why does - (-a) = a Hi, Eduardo. We can start with how -a is defined. It is "the...
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Dimensions of a Cardboard Box Associated Topics || Dr. Math Home || Search Dr. Math Dimensions of a Cardboard Box ...
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Determine whether the given function satisfies the wave equation October 13th 2010, 11:59 PM #1 Senior Member Joined Oct 2009 Posts 295 Thanks 9 Determine whether the given function satisfies the wave equation $w(x,t)=e^{x-ct}$ Thank you for the help on the last problem, but for this one I'm sti...
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University Combinatronics (Enumeration) and Basic Probability September 15th 2010, 01:09 AM aarnold University Combinatronics (Enumeration) and Basic Probability Hi! First post here. This is actually for a university level course in Discrete Mathematics. This assignment question regards the topic of enu...
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Seeing topological (geom.) properties of the space via corresponding C^*-algebra up vote 9 down vote favorite 4 Compact Hausdorff spaces bijectively correspond to C^*-algebras with identity. One needs to consider the algebra of continuous functions C(X) to go in one direction and spectrum to go in the other. ( See e.g...
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Collecting integral problems February 2nd 2008, 07:39 PM Krizalid Collecting integral problems Yes, post an interesting integral or a problem related to integration (like a sum, double sum, etc which can be computed applyin' integration), 'cause I want to collect problems and their solutions to make a PDF. ...
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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: The CMWC4827 RNG, an improvement on MWC4691. Repli...
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Income Tax and Capital Budgeting Decisions Posted on March 24, 2014 by Shamsa Rafique Income Tax and Capital Budgeting Decisions: Learning Objectives: 1. Include income taxes in a capital budgeting analysis. In our discussion of capital budgeting decisions in this chapter, we ignored income taxes for two reasons...
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&#39;vector-bundles&#39; Answers By New Users Since $H^2(S^6;\mathbb Z) = H^4(S^6;\mathbb Z) = 0$, we get $c_1(TS^6) = c_2(TS^6) = 0$. As for $c_3(TS^6)$, it equals the Euler class $e(TS^6)$, which is the Euler characteristic of $S^6$ (which equals $2$) times the generator of $H^6(S^6;\mathbb Z) = \mathbb Z$. Yes, tha...
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linear mass density? September 22nd 2013, 07:47 PM #1 Newbie Joined Sep 2013 From USA Posts 4 linear mass density? If I need to find the work in lifting a chain and I am given linear mass density, how would I go about it? I am used to being given simply the density. I have a feeling I would need...
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Relative rates of change. December 8th 2009, 10:05 AM #1 Member Joined Sep 2009 Posts 80 Relative rates of change. I'm stuck on this problem: ( u = mu, since I don't know how to do the symbol) "A spherical cell is growing at a constant rate of 400 um^3/day (1 um = 10^-6 m). At what rate is its radiu...
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Find Centre of symmetry of conic February 1st 2013, 05:24 PM #1 Junior Member Joined Jan 2013 From australia Posts 39 I have the following conic and i want to find its centre of symmetry: 3y^2+2x+18y=-31 I tried the following way but it didn't seem to work, could somebody tell me where i went wro...
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GWAPower: a statistical power calculation software for genome-wide association studies with quantitative traits Abstract Background In designing genome-wide association (GWA) studies it is important to calculate statistical power. General statistical power calculation procedures for quantitative measures often requir...
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