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Simultaneous equations to matrix August 23rd 2012, 09:13 AM #1 Member Joined Oct 2011 Posts 170 Thanks 3 Simultaneous equations to matrix So I'm given this question. $4x + 2y + 4x = 3, 2y + z = 1, 2x + 2z = 1$ and it says Forumlate a single vector matrix equation from the three equations gi...
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Integration With Inverse Trig Function March 4th 2014, 06:09 PM #1 Integration With Inverse Trig Function I want you to look at question (b) in the picture provided and tell me where (1/3) outside the integral came from. Is there factoring involved I am to use the formula below. Let INT = integral ...
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electric potential March 4th 2007, 07:53 PM #1 Member Joined Nov 2005 Posts 111 electric potential Hi please I need help to do this problem: Given the electric field vector E=x(1-sin(Φ))+ycos(Φ) where x and y are unit vectors. Calculate the voltage (potential difference) between the points...
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Geometrical structure of critical points of harmonic functions up vote 2 down vote favorite 1 For a harmonic function $\Phi$ on a simply connected subset $\Gamma$ of $\mathbb{R}^3$, define a guide curve $\gamma: I \mapsto \Gamma$ of $\Phi$ as a simple regular $C^1$ curve such that • all point in $\gamma(I)$ are cr...
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[SOLVED] Application of Differentiation April 16th 2009, 05:29 AM #1 Senior Member Joined Jul 2008 Posts 347 Hey guys Two straight roads intersect at right angles. Two men, A and B, are 100 km from the intersection, one on each road. They drive towards the intersection at 30 km/h and 40 km/h respecti...
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Vector transferring from the left side of the equation to the right February 7th 2007, 04:25 AM #1 Newbie Joined Oct 2006 Posts 2 I have equation from the form a*b=c. where a is a row vector of [1*4] b is a column vector of [4*1] and c is a number. I want to get equation of the forum b=… How can I do ...
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Math Word Problems October 14th 2008, 06:27 PM #1 Newbie Joined Oct 2008 Posts 2 Math Word Problems My math homework's due tomorrow, and I've been trying to solve these questions for a while now but I just keep getting the wrong answer / different answers each time, compared to the answers in the bac...
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morphism between two elliptic curves over a local field up vote 2 down vote favorite Let $X,Y$ be two elliptic curves over $K:=K(R)$ which have good models over $R$, Char($K$)=$0$, where $R$ complete DVR with algebraically residue field $k$. If $L$ is a finite extension of $K$, such that $X \otimes L \cong Y \otimes ...
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Lp spaces set inclusion May 11th 2010, 10:49 PM willy0625 Lp spaces set inclusion I am stuck on trying to show for that a fixed measure space $(X,\cal{S},\mu)$ with $1 \leq r \leq p \leq s < \infty$ we have $L_{p} \subset L_{r} + L_{s}$. Cheers! May 12th 2010, 01:55 PM willy0625 I have attempted ...
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Paul Cohen Dead at 72Paul Cohen Dead at 72 Paul Cohen, one of the giants of twentieth century mathematics, has died of lung disease at 72. Cohen’s major claim to fame was his resolution of the Continuum Hypothesis. Here are the basic ideas: Suppose you have two finite sets and you want to show they contain the same n...
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Tensor product of spectral sequences? up vote 3 down vote favorite 3 I'm wondering about a cross product for spectral sequences. I've got an idea, and I wonder if it is written up anywhere, or if it even holds water. Let's start with three spectral sequences, $E, F$ and $G$. Assume that $G_1^{*,*} \cong E_1^{*,*}\oti...
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Techniques of integration (6) May 22nd 2009, 07:55 AM #1 MHF Contributor Joined May 2008 Posts 2,295 Thanks 7 Techniques of integration (6) Let $f: \mathbb{R} \longrightarrow \mathbb{R}$ be continuous and periodic with period $T > 0.$ For any real numbers $a<b$ evaluate $\lim_{n\to\infty} \int_a^b f(...
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Two Probability Questions Date: 06/08/99 at 00:30:29 From: prashant Subject: Probability Dear sir: I am a student at University of Mississippi medical center. I have a great interest in probability, so I keep solving questions I get from texts and friends. I have two questions I could not solve. Kindly help me solv...
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A fast, single pass method to calculate the median in MySQL After stepping off of the GROUP_CONCAT() solution for calculating quantiles I figured it would be nice to find a better way to calculate the median too. Solution I previously wrote on how to calculate the median using GROUP_CONCAT() , but I think tha...
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Constant Function Zero and Orthogonal Functions Date: 02/08/2002 at 10:56:01 From: Neeraj Subject: Constant function zero and orthogonal functions We're currently learning about orthogonal functions. Two functions are said to be orthogonal over a given interval if integrating their product (over that interval) equal...
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Math Help Find the number of positive integers not exceeding 1000 that are not divisible by 3 or 5 There are 333 numbers that are divisible by 3 since 333*3=999. Among those 333 numbers there are 66 numbers that are also divisble by 5 since 333/5 =66.6 So 333-66 = 267 numbers that are divisble only by 3. There are 20...
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Interval Notation Date: 4/1/96 at 2:8:0 From: Maida Kelly Subject: Interval Notation Hello. I have returned to college after many years and am taking a college level algebra course. I need to learn about interval notation in terms of domain and ranges. I would appreciate it if you could point me in the right dire...
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Simplifing binomial product... I think? I really need the answers to these binomial products.... (x+1)2-(x+1)(x-1)+(x-1)2= (2a+3)(a-1)+(a-1)2-(a-1)(a+1)= (m2-8)(m+2)-(m2+8m+2)(m-3)= Thanks btw all the 2's after the numbers are all ment to representing to the power of 2 thingiy $(x+1)^2-(x+1)(x-1)+(x-1)^2$ expand the ...
4
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Re-arranging an equation. December 20th 2010, 08:59 AM DanBrown100 Re-arranging an equation. Need help with a question guys, any help will be most appreciated. The pressure, p, and volume, V, of a gas undergoing a polytropic process are related by the equation: p1V1n = p2V2n where n is the polytr...
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What to expect when i simulate a recurrence relation? September 28th 2010, 10:21 AM #1 Newbie Joined Sep 2010 Posts 11 What to expect when i simulate a recurrence relation? I am working on an assignment, and I am having trouble with this recurrence relation: x(n+2) - 3x(n+1) + x(n) = 0 x(0) = 1 ...
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"Internal" versus "external" definitions of functions: equivalent foundations for mathematics? up vote 4 down vote favorite 2 This is a generalization of the question given at Definition of Function. I think it fairly clear that the Bourbaki and the ordered pair definition of functions are equivalent. A deeper questi...
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How to Increase the Sides to Double the Area of a Square Date: 01/28/2005 at 12:16:10 From: colby Subject: double the area of a square I am puzzled as to how you would double the area of a square. Do you multiply the sides by a decimal? I can't find the right number to multiply by, or the right solution. Date: 0...
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Math Help April 27th 2011, 12:07 PM #1 Newbie Joined Apr 2011 Posts 3 T test. Hello, I was told by my lecturer that I need to do some T-tests on my data in order to find out if it is significant or not. The data is basically student's grades and I am trying to prove that intrinsic students achieve h...
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Shift operator that generates separable orbit up vote 1 down vote favorite Suppose, that $f$ is bounded measurable function, $T_h(f)(x) = f(x+h)$ is the shift operator. How to prove, that if the whole orbit $T_h(f):\, h\in\mathbb{R}$ has a dense, countable subset $T_{n_k} (f)$ (in $L^{+\infty}$ norm) then $f=g$ almost...
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Divisibility by prime April 15th 2010, 11:50 PM sashikanth Divisibility by prime Let $\frac{m}{n} = 1 + \frac{1}{2} + \frac{1}{3} + \mbox{...} + \frac{1}{p-1}$ . $p$ is a prime number > 2 . Prove that $m$ is divisible by $p$. If $p > 3$, Prove that $m$ is divisible by $p^2$. I've done the first bit, I can't...
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find the number May 19th 2008, 01:12 PM sp0rtskid55 find the number Heres the problem: The tens digit of a two-digit number is 1 more than 3 times the ones digit. Subtracting 45 from the number reverses it. Find the original number. May 19th 2008, 01:16 PM angel.white Quote: well, If the 1's...
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How to do quadratic formula? June 25th 2013, 08:37 PM #1 Member Joined Feb 2009 Posts 77 Thanks 2 How to do quadratic formula? I have an equation 2x^2+x-1 How do I rewrite in parenthesis? Like (x+ )(x- ) Etc. I got x = .5 and -1 using quadratic formula Thanks Re: How to do quadrat...
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Surface Area of Blocks Glued Together Date: 09/09/2001 at 23:15:33 From: Jodi Meyers Subject: Trig? Three cubes whose edges are 2, 6, and 8 centimeters long are glued together at their faces. Compute the minimum surface area possible for the resulting figure. I have tried this so many ways that I am not sure where ...
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Confirm/refute $f(x)$ where $f(x) = $x-th Mersenne prime ($M_p$) where $x$ is [1,2,3,4,5,6,7...] up vote 0 down vote favorite 1 While tinkering with numbers, I found $n=f(x)$ where $n = \sigma(\sigma(n)-n)$ and $x \neq p$ where $p$ is a Mersenne prime exponent, but I need help input in regard to improving accuracy. F...
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Function of random variables May 3rd 2009, 09:12 AM #1 Newbie Joined Dec 2008 Posts 5 Function of random variables can some one help in this question If X is Normal( $\mu,$$\sigma^2$) and Y is Exponentioal ( $\lambda$) What is the distribution for: Z=X+Y Z=X-Y Z=X*y Z=x/Y i...
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Math Help February 12th 2010, 10:18 AM #1 Banned Joined Jan 2010 Posts 32 angle ? Around 255 BC Eratosthenes, a Greek mathematician, estimated the circumference of the earth. He discovered that on a certain day, in the city of Syene, one could see the sun's reflection at the bottom of a deep well. A...
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Bounds on pseudosquares up vote 3 down vote favorite Suppose $n\in\mathbb{Z}^+$ is a nonsquare in $\mathbb{Z}$ but is a square mod $2^2,3^2,4^2,5^2,\ldots,k^2.$ How small can $n$ be? On the ERH, there are no small pseudosquares: $L_p>e^{\sqrt{p/2}}$. Heuristically, more is true: $\log L_p\gg p/\log p.$ I am looking f...
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FIN2100 T/F: The recent trend is for the federal government and corporations to shift more responsibility to the individual with respect to providing for their financial future True Assume you bought a 5 year certificate of deposit (CD) last year which pays 5%. If you decide to cash out of your CD before 5 years, the...
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Non Separability of the the Loeb Space up vote 3 down vote favorite 1 Let $X_i$, $i=1,2\ldots$ be finite sets of integers such that $|X_i|\rightarrow \infty$. Let $X$ be an ultraproduct of $X_i$. Let $\mu$ the Loeb measure associated with the the normalized counting measures on $X_i$. Let $B$ be the completion w.r.t $...
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Details for the action of the braid group B_3 on modular forms up vote 15 down vote favorite 7 I'm reading Terry Gannon's Moonshine Beyond the Monster, and in section 2.4.3 he hints at (but does not explicitly describe) a way to extend the action of $SL_2(\mathbb{Z})$ on modular forms to an action of the braid group $...
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Problems on Slope September 15th 2008, 08:10 PM PandaPanda Problems on Slope Here's the problem: Quote: Problem: Recall that you can use two points on a line to determine an equation for the line. Suppose two points in a coordinate plane have coordinates (x1, y1) and (x2, y2). Quote: A. Writ...
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Can you cover the Boolean cube {0,1}^n with O(1) Hamming-balls each of radius n/2-c*sqrt(n)? up vote 13 down vote favorite 1 (where c>0 and the balls need not be disjoint?) This is an embarrassingly simple question, yet somehow I couldn't find an answer (not even, "this is a well-known open problem") after spending s...
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orders of products of permutations up vote 31 down vote favorite 10 Let $p$ be a prime, $n\gg p$ not divisible by $p$ (say, $n>2^{2^p}$). Are there two permutations $a, b$ of the set $\{1,...,n\}$ which together act transitively on $\{1,2,...,n\}$ and such that all products $w(a,b)=a^{k_1}b^{l_1}a^{k_2}...$ of length ...
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Posts about Meta-Programming on Michid's Weblog Union types 12 06 2011 Comments : Tags: , Categories : In his recent blog post Miles Sabin came up with an ingenious way of expressing union types in Scala. A union type is the union of some types: its values are the union of the values of each of the individual types. ...
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self-complementary graph September 19th 2006, 08:05 PM #1 Newbie Joined Sep 2006 From Edmonton, AB Posts 8 A simple graph G is self-complimentary. Show there exists an integer k such that the order of G = 4k or 4k+1. I'm feeling a tad lost on this. I understand the idea of self-complimentary. G a...
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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: monotonic function Replies: 14 Last Post: Nov 29, ...
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Eqn of tangent line help October 5th 2009, 01:42 PM #1 Newbie Joined Feb 2008 Posts 10 Eqn of tangent line help I'm having trouble finding a value of x for f(x) whose tangent line has the slope 4/3. I am not given any information regarding points on the graph. The following is the original function ...
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Generating spatially-aware degree-preserving random graphs? up vote 0 down vote favorite In the study of biological neural networks, researchers sometimes compare hypotheses vs. a degree-preserving random null model. One major criticism against this approach is that connections in neural networks are greatly affected ...
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Chebyshev and Central Limit Theorem August 2nd 2009, 08:08 PM morganfor Chebyshev and Central Limit Theorem Let S be the number of heads in 1,000,000 tosses of a fair coin. How does on use (a) Chebyshev's inequality and (b) the Central Limit Theorem to estimate the probability that S lies between 499,500 and...
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Double summation August 23rd 2009, 11:02 AM Stonehambey Double summation Hi :) I'm having some difficulty with the following problem. Evaluate $\Sigma^5_{i=1}\Sigma^4_{j=i}(2i+j+2)$ The book I'm reading doesn't have an example where the two numbers above the sigmas are different, but does have an ...
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Chain Rule Inside of Chain Rule October 22nd 2009, 08:21 PM #1 Newbie Joined Oct 2009 Posts 2 Chain Rule Inside of Chain Rule I recently just took a Derivative Mastery Test...and although i passed, there was one problem that just stumped me and i could use some help so i dont make this mistake again. ...
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Example 8.21: latent class analysis Latent class analysis is a technique used to classify observations based on patterns of categorical responses. Collins and Lanza's book," Latent Class and Latent Transition Analysis ," provides a readable introduction, while the UCLA ATS center has an online statistical computing...
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Posts about Median Absolute Deviation on qkdb In statistics, the median absolute deviation (MAD) is a robust measure of the variability of a univariate sample of quantitative data. It can also refer to the population parameter that is estimated by the MAD calculated from a sample. For a univariate data set X[1], X[2],...
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Laplace Transform Questionn April 1st 2011, 09:57 PM #1 Super Member Joined Dec 2008 Posts 509 Laplace Transform Questionn Hi I got a couple of questions that i am having trouble with: 1)Use Laplace transform to solve the following initial value problems: $y''-2y'+2y=c$ y(0) = 20 and ...
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Simulataneous equations January 9th 2009, 07:54 AM #1 Newbie Joined Jan 2009 Posts 3 Simulataneous equations Ok I'm not entirely sure if this is possible, but would like some verification either on whether it isn't possible and if it is possible then a solution or a nudge on what to do would be great. ...
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Euclidean Algorithm December 4th 2011, 06:00 AM farmeruser1 Euclidean Algorithm Use the Euclidean Algorithm to find the multiplicative inverse of 17 in Z31: So Ive done MOST of the calculations, a=17 p=31 ..... I then get 1=(11)17-(6)31 [note 31=0 in Z31] so 1=(11)17 Butt 11 in Z31 is -20? so ...
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Raytrace of a Star Sapphire Date: 12/11/96 at 21:04:33 From: Charles Subject: Angle from one 3-dimensional vector to another in terms of rotating on x,y,and z axis. Hello, I am a HS graduate with no college math who is _very_ rusty on pre- calc and geometry/trig. My problem comes from an attempt to create a raytra...
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Distinguishing two local versions of the axiom of choice up vote 9 down vote favorite 1 Two equivalent formulations of the axiom of choice are: 1. Every family $(X_i)_{i \in I}$ of pairwise disjoint nonempty subsets of a set $X$ has a choice function. 2. Every family $(X_i)_{i \in I}$ of nonempty subsets of a set $...
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The Derivative Chapter 4 The Derivative In our investigation so far, we have defined the notion of an instantaneous rate of change, and called this the derivative. We have also identified this mathematical concept with the slope of a tangent line to the graph of a function. Recal...
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Numerically negative exceptional divisor on a surface. up vote 1 down vote favorite 1 Suppose $S$ is an algebraic surface (possibly projective) over an algebraically closed field $k$. Suppose $D_i$ are irreducible smooth curves (rational, if you want) with negative self-intersection and simple normal crossings such th...
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Poincaré duality for intersection cohomology up vote 7 down vote favorite 1 Let $X$ be a projective complex algebraic variety of dimension $d.$ Does it make sense to ask if properties like $$ (x,y)=(-1)^i(y,x) $$ holds, for $x\in IH^i(X,\mathbb Q)$ and $y\in IH^{2d-i}(X)?$ And if it makes sense, is it true? Edit: For...
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(URGENT) integration by parts January 15th 2009, 03:30 PM #1 Member Joined Jan 2009 Posts 91 (URGENT) integration by parts let I = integral e^(ax) sin (bx) dx use integration by parts to show that I = e^(ax) * (a sin (bx) - b cos (bx)) / (a^2 + b^2) + C i have tried every possible combinati...
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Divisible or Remainder?? Does 9 divide 5^(23) + 1? If not, what is the remainder? How is this done? Note $23 = 16+4+2+1$ (all powers of $2$). So $5^{23} = 5^{16}\cdot 5^4\cdot 5^2\cdot 5^1$. $5^1 \equiv 5 \mod{9}$ $5^2 \equiv 7 \mod{9}$ $5^4 =\left(5^2\right)^2 \equiv 7^2 \equiv 4 \mod{9}$ $5^8 =\ left(5^4\right)^2 \e...
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Are extensions of profinite groups profinite? up vote 2 down vote favorite 1 Assume $X$, $E$ and $G$ are topological groups and $1\to X\to E\to G\to 1$ a short exact sequence of continuous group homomorphisms. Under which of these conditions is $E$ a profinite group? (i) $G$ profinite, $X$ finite (ii) $G$ profinite,...
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Solving Trig Problems Date: 08/18/97 at 04:44:07 From: Venessa Subject: Solving trigonometry I'm studying in high school and got these problems from past year questions: 1. Find the value of Tan [(x+1)/(x-1)]^(-1) + Tan (x)^(-1). 2. Given that sin[x]^2 + 6 sin[x]cos[x] + 9 cos[x]^2 = A + B sin[2x] + C cos[2x], ...
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BetterLesson Lesson: Function rules from a table 3274 Views 58 Downloads 3 Favorites Lesson Objective I can write function rules from a table Lesson Plan ┌─────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────────────────────────────────────────────...
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Dreadful Plumbing with Downward Nominal Rigidity Dreadful plumbing with downward nominal rigidity Actually more or less readable version here . This is the pointless math post which accompanies this and especially this post at angrybearblog. Here I am assuming that transition out of the liquidity trap is predicta...
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Coiling Rope in a Box up vote 17 down vote favorite 3 What is the longest rope length L of radius r that can fit into a box? The rope is a smooth curve with a tubular neighborhood of radius r, such that the rope does not self-penetrate. For an open curve, each endpoint is surrounded by a ball of radius r. For a box of...
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Subsystems of Peano arithmetic and incompleteness theorem up vote 4 down vote favorite 2 I think everyone is familiar with Goedel's incompleteness theorems. In particular they imply that PA (Peano arithmetic) can not prove its own consistency. Now my question is what is the largest subsystem of PA that "can" prove its...
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Lecture 13: Electromagnetic Waves, Polarization PROFESSOR: Today's lecture is going to be about electromagnetic radiation which is one of the highlights in 8.03 and one of the great victories of 19th century physics. So far we've dealt with electromagnetic waves, well excuse me, with mechanical waves. And we've dealt w...
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Natural Log and Log Hello, Can someone please help me solve this? a. ln(1/e) b.logsqrt10 $<br /> \ln\left(\frac{1}{e}\right) = \ln(e^{-1})= -1\times \ln(e) = -1\times 1 = -1<br />$ $<br /> \log_{10}(\sqrt{10})=\log_{10}(10^{\frac{1}{2}})= \frac{1}{2}\log_{10}(10) = \frac{1}{2}\times 1 = \frac{1}{2}<br />$
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Combinations Help June 18th 2010, 01:28 PM #1 Newbie Joined Jun 2010 Posts 8 Combinations Help In how many ways can 12 prices be awarded evenly among four people? I am not sure how to start this question. Also, one more: From a deck of 52 cards, how many different four-card hands could be ...
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Integrate a function which includes the integral of itself September 14th 2009, 07:04 AM #1 Newbie Joined Sep 2009 Posts 2 Integrate a function which includes the integral of itself I've got the formula for the acceleration of a vehicle. Basically it looks like this: $a = c_1 - c_2*v^2 - c_3$ Whe...
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Generalisations of Riemann-Roch for surfaces up vote 2 down vote favorite 3 Let $X$ be a smooth projective algebraic surface (over $\mathbb{C}$ ). For all $L\in \mathrm{Pic}(X)$, we have $$\chi(L)=\chi(\mathcal{O}_X)+\frac{1}{2}(L^2-L\cdot \omega_X).$$ This is the famous Riemann-Roch theorem in the flavour I like the ...
4
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Factorisation December 3rd 2009, 09:06 PM Paymemoney Factorisation Can someone tell me if i have factorized correctly: Equation is this: $x^4-6x^2+1$ First i completed the square: $x^4-6x^2+1$ $x^4-6x^2+1-9x^2$ $(x^2-3)^2-(3x)^2$ $(x^2-3-3x)(x^2-3+3x)$ Now i use the difference of two...
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Number theory- mobius,multiplicative,primitive root August 24th 2010, 06:32 AM #1 Newbie Joined Aug 2010 Posts 9 Number theory- mobius,multiplicative,primitive root 1 i) When do we say that a function f:N-->C is multipicative? ii)Define mobius funtion 'mu' and show it is multiplicative. iii...
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Need help solving two stochastic differential equations November 22nd 2011, 02:00 AM Eloqent Need help solving two stochastic differential equations Hello, I'm new here, so I guess I should introduce myself. I'm a student at a math. finance course. We have some homework where we have to solve two stochastic diff...
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Math Forum Discussions fom Posts: 1,968 Registered: 12/4/12 Re: Notation Posted: May 25, 2013 10:48 PM On 5/25/2013 8:36 PM, William Elliot wrote: > On Sat, 25 May 2013, fom wrote: > >> On 5/24/2013 10:57 PM, William Elliot wrote: >>> V is the ZFC universe. >>> L is the constructible universe. >>> L_omega0 is the ome...
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Additivity of projective dimensions, or, help me lower my blood pressure up vote 8 down vote favorite 2 Sorry for the shameless title. I'm rather stuck on a lemma in commutative algebra - namely, I have both a proof and a counterexample! I have tried rather strenuously and frustratingly to find the error here, without...
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Math Forum Discussions Re: Integral test Posted: Dec 11, 2012 1:44 AM On 11/12/2012 00:57, Rotwang wrote: >> One of my students asked me today a question that I was unable to >> answer. Let _f_ be an analytical function from (0,+oo) into [1,+oo) and >> suppose that the integral of _f_ from 1 to +oo converges. Does it...
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solve given a yh1 May 15th 2009, 11:52 PM pberardi solve given a yh1 Hello, I cannot for the life of me remember how to do this. Can someone help please? Solve the following differential equation xy''+y'=12x^2 given that yh1 = 1 is a solution of the homogeneous equation. Thanks. May 16th 2009, 01:...
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intergral by interpreting it in terms of areas June 28th 2010, 04:29 PM bigwave intergral by interpreting it in terms of areas I am fairly new to this so... $\int_{-3}^0(1+\sqrt{9- x^{2}})dx<br /> \Rightarrow<br /> \int_{-3}^{0}1dx + \int_{-3}^0\sqrt{9- x^{2}}dx<br /> \Rightarrow<br /> 3 + \int_{-3}^0\sqrt{...
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The first eigenvalue of the laplacian for complex projective space Take the 2-minute tour × MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. What is the exact value of the first eigenvalue of the laplacian for complex projective space viewed as $SU...
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Math Forum Discussions Virgil Posts: 9,012 Registered: 1/6/11 The Linearity found that WM claimed but could not find! Posted: Mar 20, 2013 8:15 PM WM claimed to have a bijective linear mapping (isomorphism of vector spaces, or at least modules) from the set of all infinite binary sequences to the set of all paths in ...
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logarithmic equation from points May 27th 2006, 05:49 PM #1 Newbie Joined May 2006 Posts 12 logarithmic equation from points i need to derive a logarithmic equation in the form y=aloge(x+b)+c given that it passes through the points (0,0) (12,20) (30,30) it is a positive log with a horizontal asym...
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Fol 13 November 16th 2011, 12:54 AM logics Fol 13 Enderton 2.2.19 An $\exists_2$ formula is one of the form $\exists x_1 \cdots x_n \theta$, where $\theta$ is universal. (a) Show that if an $\exists_2$ sentence in a language not containing function symbols (not even constant symbols) is true in $A$, th...
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How do you do this proof of perfect integer? November 15th 2009, 10:11 AM mathgirl13 How do you do this proof of perfect integer? I'm completely stuck on this proof. I know the idea of how to do it, find the factors, add them, and show its the same, but I have no idea what the factors should be. Here's the quest...
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Taylor polynomial of third degree and error estimation October 24th 2010, 01:16 PM #1 Member Joined May 2010 Posts 241 Taylor polynomial of third degree and error estimation It seems that I'm a little bit lost about this exercise. It says: Find the taylors polynomial of third degree centered at the origi...
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Are there oriented $4k+2$ manifolds such that $im(H_{2k+1}(M; Z/2)\to H_{2k+1}(M, \partial M; Z/2))$ has odd dimension? up vote 7 down vote favorite 2 The following fairly specific question comes up in a bordism computation I'm trying to do: Are there compact $\mathbb Z$-oriented $4k+2$ dimensional manifolds with bou...
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Solving Harmonic Motion Problems with a period/seconds in decimals March 12th 2011, 09:19 AM MajorJohnson Solving Harmonic Motion Problems with a period/seconds in decimals An object is attached to a coil spring, the object is propelled downwards fromits rest prosition at time t = 0. Write an equation for the di...
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Math Forum: Ellipse, Parabola: Formulas for area, perimeter, length, etc. Preliminaries The circumference C of an ellipse must be computed using calculus. To do this, we set up a Cartesian coordinate system. We put the origin at the center of the ellipse, the x-axis along the major axis, whose length is 2a, and the y-...
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Trigonometry Word Problem ... Question 3 June 12th 2009, 12:16 PM #1 Member Joined Jun 2009 Posts 86 Trigonometry Word Problem ... Question 3 The following questions are for a final class project. Obviously these questions are very hard, and I am unsure how to completely answer these with the proper and ...
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Units and Cylinder Volume Date: 02/06/2003 at 20:59:10 From: Dan Subject: Cylinders My 7th-grade daughter brought home a question: A cylindical storage tank has a radius of 15ft and a height of 30ft. Find the volume of the tank. to find volume: Pi x r^2 x H My answer was 21205.75 It was wrong. I am total...
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abstract algebra: subgroups question March 6th 2013, 11:21 AM #1 Newbie Joined Dec 2012 From Los Angeles Posts 12 abstract algebra: subgroups question If G is a finite Abelian group, H, K ≤ G, and if x ∈ H K with o(x) = p a prime, show that H or K must contain an element of order p. Re: abstract alg...
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Path integrals outside QFT up vote 8 down vote favorite 8 The main application of Feynman path integrals (and the primary motivation behind them) is in Quantum Field Theory - currently this is something standard for physicists, if even the mathematical theory of functional integration is not (yet) rigorous. My questi...
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Change of Basis October 30th 2010, 01:24 PM #1 Member Joined Jun 2010 Posts 205 Thanks 1 Change of Basis So I've done a few change of bases and they're hard but I'm getting the hang of them. Now I have this: $\displaystyle \int \int_{R} \sin(9x^{2} + 4y^{2}) \,\, dA$ where $R$ is the region in the ...
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Problems..... Help we can cross multiply, do you know how? we get: $\frac {4x + 1}{3} = \frac {x - 5}{2}$ $\Rightarrow 3(x - 5) = 2(4x + 1)$ can you continue? a similar trick can be used for the first, but i wouldn't do it. it's simple enough not to use this trick. remember, our objective is to get x by itself on one s...
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Compactness Theorem for First Order Logic up vote 5 down vote favorite 4 Hi all, I am interested in proofs without using Goedel's completeness theorem. • Does anyone have a reference to a proof of this theorem that uses Skolem Functions? • How come Enderton's (Introduction to Logic) has a half a page proof (which...
4
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Loan Repayment February 6th 2010, 03:06 AM MickG Loan Repayment Hi, This is a query relating to the calculation method for the repayments of loan. Example:- Using the PMT Function on a Loan of £7500, Over 4 years Monthly repayments @ 8.7%. The Function instructions uses the Yearly interest rate divides by 12...
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Word problems August 13th 2009, 09:18 AM Vicky1997 Word problems 1. The cooling system of Alex's car holds 10 quarts. It is now filled with a mixture that is 60% water and 40% antifreeze. Hearing a weather forecast for severe cold, Alex decides to increase the strenth of the antifreeze mixture to 50%. To do ...
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Calabi-Yau manifolds and polygonal linkage configuration spaces: related? up vote 6 down vote favorite 2 I was reading about Calabi-Yau manifolds, about which I know little, and was wondering if these (or related complex manifolds, perhaps K3 surfaces) can be viewed as configuration spaces (or moduli spaces) of articu...
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Subset of order > 1/2 of order G February 24th 2009, 01:29 AM Chandru1 Subset of order > 1/2 of order G If G is a finite goup and let $A \subseteq G$. if $|A|> |G|/2$ then prove that for every $g \in G$ there exists [tex]h,k \in A [/Math] such that $hk=g$ (Headbang) February 24th 2009, 09:13 AM ThePerfectHacke...
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Additive and multiplicative Inverse November 11th 2010, 09:31 PM #1 Junior Member Joined May 2010 Posts 26 Additive and multiplicative Inverse Hi All, Having a real hard time in particular getting a grasp on multiplicative inverse. In a standard tut question is see is : Compute the additive and...
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Disk method. March 3rd 2010, 02:36 PM #1 Newbie Joined Feb 2010 Posts 4 Disk method. find the volume of the solid generated by revolving each region about the y-axis the region in the first quadrant bounded above by the parabola y=x^2, below by the x, axis, and on the right by the line x=2. Wor...
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[ 0.050537109375, -0.002471923828125, 0.0054931640625, -0.0771484375, -0.006500244140625, -0.0556640625, -0.10302734375, 0.0859375, 0.013916015625, -0.000217437744140625, -0.02099609375, 0.06640625, 0.0247802734375, 0.056884765625, -0.01708984375, 0.002899169921875, 0.017578125, -0.0...
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Help with partial fractions? June 11th 2011, 04:34 PM Lancet Help with partial fractions? I'm familiar with the cover up method of dealing with partial fractions. That being said, this is what I'm looking at: $\frac{1 - v}{(v+1)^2}$ Obviously, the cover up method won't work here, as we would end up wit...
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[ -0.060546875, 0.18359375, -0.0203857421875, 0.05224609375, 0.0184326171875, -0.00933837890625, -0.140625, -0.053466796875, -0.00909423828125, 0.0145263671875, -0.00469970703125, -0.00139617919921875, -0.05419921875, 0.0830078125, -0.031494140625, -0.024169921875, 0.031005859375, 0....
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