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Projective planes that contain the Fano plane up vote 4 down vote favorite I am interested in the following question: Given a projective plane of order $n=2^a$, is its incidence matrix must contain the incidence matrix of the Fano plane? If not, is it true that for any $n$ of the form $n=2^a$ there exists a projectiv...
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Number Theory GCD Linear Combination July 13th 2008, 05:33 PM #1 Junior Member Joined Jun 2008 Posts 27 Number Theory GCD Linear Combination Hi again (as you can tell, I've been working on this stuff all day, sorry for posting so much!) Right now I'm working on a Linear Combinations problem. He...
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Linear Programming Problem!! March 13th 2008, 01:41 PM #1 Newbie Joined Oct 2007 Posts 18 Linear Programming Problem!! Consider the following linear programming problem: Maximise Z = 100x1 + 200x2 Subject to 3x1 + 2x2 ≤ 120 x1 + 4x2 ≤ 80 2x1 + x2 ≤ 100 x1, x2 ≥ 0 Solution is Z=...
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Real Numbers Date: 08/08/97 at 14:36:30 From: Hari Seldon Subject: Real numbers What exactly is a real number? When I first started algebra, I used them all the time, because they were the only numbers I knew. Then I learned about complex numbers, and how they could be used in various ways. Then I learned about thin...
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Find the basis and it's dimension May 3rd 2009, 10:22 AM orendacl Find the basis and it's dimension Find a basis for W = {|a b| _____|c d| :a+d=b+c} and state the dimension of W. Showing my work: I thought one way to solve this would be to exhange values in the matrix: Then establish ...
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SCIENTIFIC NOTATION REVIEW Do you know this number, 300,000,000 m/sec.? It's the Speed of light ! Do you recognize this number, 0.000 000 000 753 kg. ? This is the mass of a dust particle! Scientists have developed a shorte...
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Is the singular homology of a real algebraic set always finitely generated? up vote 12 down vote favorite 2 Here is a precise statement of my question: Let $p\in \mathbb{R}[x_1, \ldots, x_n]$ be a polynomial, and let $Z(p)\subset \mathbb{R}^n$ be the set of zeros of $p$. Must the singular homology $H_i (Z(p); \mathbb...
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Homework Help Posted by Chanell on Sunday, April 10, 2011 at 4:21pm. if x+y=11, y+z=14, and x+z=13, what is the value of x+y+z ? • geometry - Henry, Tuesday, April 12, 2011 at 2:41pm Eq1: X + Y = 11. Eq2: Y + Z = 14. Y = 14 - Z. Eq3: X + Z = 13. X = 13 - Z. In Eq1, substitute (13-Z) for ...
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They never saw it coming Issue 33 January 2005 Motion camouflaging and nature's stealth fighters The word "stealth" is often associated with high-tech bombers built to be invisible to enemy radar. This technology works through the aircraft's surface being specially designed and having a covering of radar-absorbent ...
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Homework Help Posted by Blegh on Saturday, November 3, 2012 at 2:29pm. We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year calculus course. What's the minimum sample size needed to construct a 95% confidence interval for a proportion with a ma...
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Math Forum Discussions Virgil Posts: 9,012 Registered: 1/6/11 Re: Distinguishability of paths of the Infinite Binary tree??? Posted: Dec 29, 2012 2:21 AM In article <577c1bed-657f-4aa2-a66c-9d8f225fdcff@gu9g2000vbb.googlegroups.com>, Zuhair <zaljohar@gmail.com> wrote: > On Dec 29, 4:06 am, Virgil <vir...@ligriv.com>...
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Number of functions October 22nd 2008, 11:34 AM #1 Number of functions Let S={1,2,3,4}. Find the number of functions $f: S \to S$ such that $f(f(x)) = 1$ for all $x \in S$. Last edited by alexmahone; October 23rd 2008 at 03:34 AM. Last edited by Moo; October 22nd 2008 at 12:28 PM. And also: $f:...
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Homework Help Posted by sierra on Monday, April 23, 2007 at 1:16pm. Need help solving problems using the Trigonometric Identities: 8cos^4 thet=cos4theta+4cos2theta+3 I am a bit unsure how to solve it. I am aware that the first step I must take is to simplify the problem and then use the Product to Sum formula Nasty ...
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Math Help Square both sides: $(x^2 - 16)^2 = (2x-1)^2$ $x^4 - 32x^2 + 256 = 4x^2 - 4x + 1$ $x^4 - 36x^2 + 4x + 255 = 0$ You now need to solve this. If you can picture the graphs, you'll know that there is one solution (the most positive) when equating $x^2 - 16 = 2x - 1$ $x^2 - 2x - 15 = 0$ $(x-5)(x+3) = 0$ So, (x-5) ...
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What prevents a cover to be Galois? up vote 8 down vote favorite 4 Let $f:X\rightarrow Y$ be a ramified cover of Riemann surfaces or algebraic curves over $\mathbb{C}$. My question is can one in terms of the ramification data of $f$, determine whether the cover is Galois or not. I am Specially interested in the follow...
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FP2 - question on simultaneous equations August 14th 2009, 10:37 AM pepsi FP2 - question on simultaneous equations Posted on Friday, 14 August, 2009 - 06:24 pm: hi..thanks Question: Find the two values of k for which the equations (1) 6x + 3y = 9 (2) kx + 8y = 6 do not have a unique soluti...
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Randomly Cutting a Rope into Two Segments Date: 05/14/98 at 20:12:26 From: William Luh Subject: Probability of cutting ropes A rope 20m long is randomly cut into two segments, each of which is used to form the perimeter of a square. (a) Find the probability that the larger square has an area greater than ...
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help with integral August 7th 2009, 07:08 AM #1 Newbie Joined Aug 2009 Posts 1 help with integral hey guys, I need to prove that the following integral converges int ( sqrt(x) * cos(x^2) dx , x = 0 to infinity ) Using Wolfram I found that the solution can be expressed in the closed form ...
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Can anyone solve me this maths equation, please? January 19th 2009, 01:29 AM lewuk09 Can anyone solve me this maths equation, please? V = 240 ( 1 - e -(rt)L ) given R = 1 ohm given L = 200mH calculate the time when the voltage is expected to be 140v been trying for ages just cant crack it Janu...
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How do you solve for x when 2sin(2x-60°)=1? April 7th 2009, 08:43 PM #1 Newbie Joined Apr 2009 Posts 12 How do you solve for x when 2sin(2x-60°)=1? How do you solve for x for this equation: 2sin(2x-60°)=1? where -2π ≤ x ≤ 2π [π=pi] I am unsure of where to start for this one $2 \sin (2...
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units/ones digit August 2nd 2010, 10:30 AM #1 units/ones digit Hi all, if given a number like $56^{34}$, how would I find the units digit without multiplying the number out? What about for expressions such as $(867)\times (563)\times (y-2)$? What is the method? We are interested in 56^34 (mod 10). ...
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Problem with inequalities Well, I'm not done yet. Am I on the right track? $\sqrt{x^2-9x+20}\leq\sqrt{x-1}\leq\sqrt{x^2-13}$ $x^2-9x+20\leq{x-1}$ $x-1\leq{x^2-13}$ $x^2-10x+21\leq{0}$ $0\leq{x^2-x-12}$ $(x-7)(x-3)\leq{0}$ $0\ leq{(x-4)(x+3)}$ Hi Nathan02079! Are you supposed to be solving the inequality for x? Or just...
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Very Basic Number Help please... October 6th 2012, 08:42 AM #1 Newbie Joined Oct 2012 From London, England Posts 3 Very Basic Number Help please... Hi, I am new to this forum and really really hoping you can help me! I am only university age (in the UK) but with an A Level in Maths, I spend some...
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Linear Approximation of 3cos^2(3) to estimate the value of |cos(3) May 13th 2011, 07:08 PM #1 Junior Member Joined Apr 2011 Posts 68 Linear Approximation of 3cos^2(3) to estimate the value of |cos(3) hey guys can you help me with this: Use a linear approximation of 3cos^2(3) to estimate the value of...
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number theory number theory It is one of the oldest parts of mathematics, alongside geometry, and has been studied at least since the ancient Mesopotamians and Egyptians. Perhaps because of its purely mathematical nature (at least until the development of cryptography and cryptanalysis in the twentieth century, numbe...
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Extending a partial order while preserving an automorphism up vote 9 down vote favorite 2 It is well known that if $(P, \leq)$ is a partial order then $\leq$ can always be extended to a linear order. This is sometimes called Szpilrajn´s theorem although it had been previously proved by Banach, Kuratowski and Tarski. ...
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Thermo/Stat Mech Power Page MAPLE/Mathematica/Spreadsheet Resources ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ ┃ For a start ... ...
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integration: by parts July 11th 2007, 06:33 AM ^_^Engineer_Adam^_^ integration: by parts $\int e^x(\cos{x})dx$ substituted it to dv = e^(x) dx v = e^(x) u = (cos(x)) u = -sin(x) dx and this one goes infinity for me help needed for what to sub ... i dunno how the integrator got a s...
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What Does Negative Temperature Mean? [Physics FAQ] - [Copyright] Original by Scott I. Chase. Below Absolute Zero—What Does Negative Temperature Mean? Questions: What is negative temperature? Can you really make a system that has a temperature below absolute zero? Can you even give any useful meaning to the expressi...
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unbounded complexity up vote 1 down vote favorite If a language L is decidable, does that imply that the is a computable function f such that L is in O(f(n)) ? For example what would be the complexity class of the language of "provably halting Turing machines that halt in an even number of steps" computational-compl...
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some electrostatics questions September 7th 2010, 09:20 PM #1 Member Joined Mar 2008 From ??? Posts 169 some electrostatics questions these are some questions which I coudnt get Q1 : A thick shell with inner radius R and outer radius 3R has uniform volume charge density ''sigma" it has a sph...
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simple calculus question August 15th 2012, 07:57 AM farhadb simple calculus question Hi guys, I have a simple calculus question, (so simple it's actually embarrassing(Worried)) So I'm reading this article that says: $\mbox{if we have: } p(D_i,D_i^* \mid \Psi) = \frac{1}{4w_i} sech^2(\frac{D_i^* - D_...
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Another center of mass problem July 7th 2009, 02:29 AM #1 Another center of mass problem Hi! Attached picture below. Problem: Calcuate center of mass of the slender rod. Solution attempt: Since the density varies, I did: With $dm = \rho \cdot A \cdot dx$ , because I guess the area is the same ...
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Fibonacci sequence induction proof October 1st 2010, 08:46 AM #1 Newbie Joined Oct 2010 Posts 3 Fibonacci sequence induction proof Hi! I have a assignment involving the fibonacci sequence, and I wonder if anyone could give me a hand with it: The fibonacci sequence is given as: $f_{n} = f_{n-1...
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s theorem L\"ob's theorem Löb’s theorem Löb’s theorem In this short article we will provide an example where one’s intuition can be faulty, and that strict formalization is always needed when one does mathematics in order to avoid possible hidden intuitive inconsistencies. A striking example is the erroneous but int...
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The Intermediate Value Theorem Date: 09/14/98 at 05:42:14 From: BOOK Subject: Intermediate Value Theorem I don't understand about the "Intermediate Value Theorem" at all. Can you please explain it to me? Also for the function: f(x) = 1/(x-3) + 2, x not equal to 3 verify that f(0) < f(5), find the value of f(...
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Vector Spaces Date: 06/11/99 at 00:04:19 From: Brian Reid Subject: Vector spaces Is V = {(x,y) in R^2 | y = 3x+1} a vector space if addition and multiplication by a scalar are defined by: (x,y) + (x',y') = (x+x',y+y'-1) k(x,y) = (kx,k(y-1)+1) Part (b): give reasons for your answer in (a). My son is taking m...
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Homework Help Posted by rachel on Monday, November 21, 2011 at 9:41pm. solve by substitution. 0.5x+0.25y=36 y+18=16x • algebra 1 - Anonymous, Tuesday, November 22, 2011 at 8:59am y + 18 = 16 x y = 16 x - 18 ______________ 0.5 x + 0.25 y = 36 x / 2 + y / 4 = 36 Multiply both sides with...
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Reflection of light June 4th 2013, 05:44 AM #1 Newbie Joined Jun 2013 From Zurich Posts 2 Reflection of light I have the following problem that i have to solve: A light ray emitted from Point A is reflected at a mirror and then passes through the Point B. The plane of the mirror is given by ...
5
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Group Velocity vs Phase Velocity When we left off, I told you I had come up against a paradox when applying the principle of least action to the trajectory of an electron. I started by doing it for baseballs. But I didn't do what Feynman does, where he minimizes the action between the starting and ending point. I assum...
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Linear Density April 2nd 2006, 09:30 AM #1 Super Member Joined Mar 2006 Posts 705 Thanks 2 Linear Density I came across this problem just now: The mass of the part of a rod that lies between its left end and a point x meters to the right is 5x^{2} kg. The linear density of the rod at 8 meters is...
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Hide and seek on a spherical planet August 23rd 2010, 07:50 AM #1 Junior Member Joined Jul 2010 Posts 52 Hide and seek on a spherical planet A single inhabinant lives on a surface of a spherical planet on which he can move freely with velocity u. A spaceship approaches the planet with velocity v. Show th...
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Question on canceling fractional quantities October 3rd 2012, 08:17 AM #1 Member Joined Jul 2012 From United States Posts 87 Thanks 3 Question on canceling fractional quantities This is more of an algebra question than calculus, but it involves derivatives so I thought I'd post it here. I ha...
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Proving integers? September 1st 2012, 04:55 AM #1 Newbie Joined Aug 2012 From here and there Posts 4 Proving integers? Let n>1 be an integer. Prove that φ (n) | n if and only if n is of the form 2^a 3^b where a≥1 and b≥0 are integers. Re: Proving integers? $\varphi(2^a3^b)=2^a3^{b-1} | 2^a3^b$ ...
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The (Not So) Simple Pendulum Posted by: Ron D. in clocks Pendulums are the defining feature of pendulum clocks, of course, but today they don’t elicit much thought. Most modern “pendulum” clocks simply drive the pendulum to provide a historical look, but a great deal of ingenuity originally went into their desi...
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Related Rates Problems October 30th 2007, 05:23 PM #1 Related Rates Problems 1. A spotlight on the ground shines on the wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.6 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the ...
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question on using derivative to find orginal problem March 15th 2007, 05:37 PM #1 Junior Member Joined Mar 2007 Posts 37 question on using derivative to find orginal problem If you have a third degree polynomial such that Q(1) = 1 Q'(1)=3 Q''(1) = 6 and Q'''(1)=12 what is the original polynomial? Is ther...
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Help with using the quotient rule on a derivative? May 31st 2010, 05:16 PM #1 Newbie Joined May 2010 Posts 11 Help with using the quotient rule on a derivative? I don't know why, but for some reason I absolutely cannot get the answer to this derivative: h(x) = sqrt(x)/x^3+1 I got as far as writ...
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Are these two integral answers equivalent? June 30th 2013, 09:11 AM wondering Are these two integral answers equivalent? $\int sec^2xtanxdx$ I let u=tanx du=sec^2xdx $\int udu$ $\frac{u^2}{2} + C$ $\frac{1}{2}tan^2x + C$ The answer key let u=sec^2x Their answer is $\frac{1}{2}se...
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proving identities please i need help with this problem. cosB/1-tanB + sinB/1-cotB = sinB + cosB how can i prove this identity? working on the left side ... $\frac{\cos{\beta}}{\cos{\beta}} \cdot \frac{\cos{\beta}}{1-\tan{\beta}} + \frac{\sin{\beta}}{\sin{\beta}} \cdot \frac{\sin{\beta}}{1-\cot{\beta}}$ $\frac{\cos^2{...
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Compute the Limit: Question 3 September 24th 2011, 08:22 PM sparky Compute the Limit: Question 3 Is the following correct? $\text{Calculate } \lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1}$ $= \lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1 } \cdot \frac{\sqrt{x^2+8}+3}{\sqrt{x^2+8}+3}$ $...
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Why Heisenberg can't stop atomic collapse TL;DR A heuristic argument to show that hydrogen atoms are stable and have a minimum energy level is wrong. I will assume undergraduate level quantum mechanics in the discussion. Introduction There's a popular argument used to explain why atoms are stable. It shows there is ...
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Help understanding what this theorem means March 29th 2011, 04:35 PM paupsers Help understanding what this theorem means Theorem. If $p$ is a prime and $(a,p)=1$, then the congruence $x^n$$\equiv$$a (mod p)$ has $(n, p-1)$ solutions or no solution according as $a^{(p-1)/(n,p-1)} \equiv 1 (mod p)$ or not....
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Newton-Raphson Method Date: 06/24/2009 at 10:17:12 From: William Subject: Failure of Newton-Raphson Are there any equations that cannot be solved using the Newton-Raphson method (irrespective of the initial estimate)? I thought 0 = arctan(x) might not be solvable but one just needs to choose an initial value within ...
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Field Extensions March 16th 2006, 08:16 AM DMT Field Extensions Say: $\alpha = \sqrt{2 + \sqrt{2}}$ And let: $\beta = \sqrt{2 - \sqrt{2}}$ How do I show that $\beta$ is an element of the field extension: $Q(\alpha):Q$ (the problem is to show that this field extension is normal, whic...
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Evaluate the Integral March 8th 2009, 06:53 PM #1 Newbie Joined Mar 2009 Posts 20 Evaluate the Integral ∫sin³(x/2) from 0 to pi/3. I have.. ∫sin²(x/2)sin(x/2) ∫[1-cos²(x/2)]sin(x/2) ∫sin(x/2) - cos²(x/2)sin(x/2) ∫sin(x/2) - ∫cos²(x/2)sin(x/2) I don't know where to go from there...
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compact surfaces question May 11th 2013, 11:28 AM #1 Newbie Joined Dec 2012 From Los Angeles Posts 12 compact surfaces question Let M be a closed, orientable, and bounded surface in R3 a) Prove that the Gauss map on M is surjective b) Let K[+](p)= max{0, K(p)} Show that the integral over the ...
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Homework Help Posted by Kenzie on Monday, November 5, 2012 at 11:52pm. 3x-1/x^2-10x+26 Find all (real) zeros of the function Find all (real) poles of the function The function has... A horizontal asymptote at 0? A non-zero horizontal asymptote? A slant asymptote? None of the above • College Algebra - Reiny, ...
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Order of Operations - GMAT Math Study Guide Definitions • Order of Operations - The sequence (or order) by which computations (or operations) are performed on an expression, term, equation, etc. Order of Operations The order of operations refers to the order in which fundamental mathematical operations must be do...
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Domain and Range of x^x Date: 08/24/98 at 21:19:37 From: Larry Subject: Domain and range What is the domain and range of x^x? Date: 08/24/98 at 23:15:02 From: Doctor Jaffee Subject: Re: Domain and range Hi Larry, The value of x can't be 0, because 0^0 is undefined. Consequently, y can't be 0 either because the o...
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Lower bound on the dimension of a subspace of $\mathbb Z_2^r$? up vote 4 down vote favorite This question may be very trivial, I apologize if it is so. I have subspace $V\subset \mathbb Z_2^r$ with the property that for every choice of a subset $I$ of $k$ elements in $\{1,2,\dots r\}$, the projection of $V$ onto the...
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Showing a parametric equation is smooth? April 22nd 2008, 09:01 AM #1 Newbie Joined Apr 2008 Posts 4 A parametric equation, say r(t), is smoothly parametrized if: 1. its derivative is continuous, and 2. its derivative does not equal zero for all t in the domain of r. Now that sounds simple e...
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E.W.Dijkstra Archive: A somewhat open letter to Uri Leron (EWD 1049) A somewhat open letter to Uri Leron Dear Colleague, you end your letter of March 30, 1989, with: “I finish with a puzzle, that somehow seems to me related to your Sylvester's theorem (EWD1016). Consider two finite, equinumerous sets of points in th...
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Matrix eqn April 9th 2008, 10:59 AM #1 Junior Member Joined Feb 2008 Posts 61 Matrix eqn Matrix A = (3 -5 1 -1 4 -1 2 0 0 2 -1 -1 3 0 -3 1) Express A as the sum of a symmetric matrix U and a skew-symmetric matrix V such that A = U+V Two unkowns in this Q? How can i solve this? ...
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F test Talk0 34,135pages on this wiki Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social | Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology | Statistics: Scientific method · Re...
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How many permutations are there? March 22nd 2010, 02:16 PM #1 Junior Member Joined Jan 2010 Posts 50 The English alphabet has 26 letters, 5 of these are vowels. How many permutations of English letters are there in which all vowels are in consecutive places? My answer: There are C(26,5) + C(2...
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Parabolic induction for GL(2,Z/pn) up vote 2 down vote favorite 1 Fix a finite extension $F$ of $\mathbb{Q}_p$. Consider its ring of integers $\mathfrak{o}$ with maximal ideal $\mathfrak{p}$. Set $R_n = \mathfrak{o}/\mathfrak{p}^n$. Let $\mathrm{B}$ be the upper triangular matrices. Consider a character $\mu : \mathrm...
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Convergence of power series March 28th 2011, 05:30 PM #1 Junior Member Joined Feb 2010 Posts 42 Convergence of power series basic complex analysis (so z is complex): Prove that the power series $\sum_{k=0}^{\infty} z^{k}$ converges at no point on its circle of convergence |z| = 1 Attempt: ...
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Ambiguity in probability questions February 26th 2013, 06:26 PM Paze Ambiguity in probability questions I feel that many probability questions are very ambiguous concerning the choice of words. For example: In a talent show there are 12 contestants. The judges will choose 5 contestants and place them in the...
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Minima problem April 4th 2009, 06:11 AM #1 Member Joined Nov 2008 Posts 171 Minima problem THe number of minima of the polynomial 10 x^6 - 24 x^5 + 15 x^4 + 40 x^2 + 108 is ? (I took derivative and found a polynomial of degree 5. But making its roots and then testing each one for minima is going to ...
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Covering problem (board and dominoes) September 28th 2010, 08:48 AM doug Covering problem (board and dominoes) We cut off some squares from the bottom row (rank) of a 2k x 2k board. We should prove that we can cover the board with 2 x 1 dominoes if and only if the number of the cut black and white squares ar...
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Electrical Engineering Archive | November 19, 2011 | Chegg.com Electrical Engineering Archive: Questions from November 19, 2011 • Anonymous asked 1 answer • Anonymous asked 1 answer • Anonymous asked 1 answer • Anonymous asked 1 answer • Anonymous asked 1 answer • Anonymous as...
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Cofactors, adj, 2x2 matrix February 26th 2010, 04:58 PM #1 Cofactors, adj, 2x2 matrix I really need some clarification about cofactors and adj of a 2x2 matrix say the matrix is a b c d what would the cofactors be? what would the adj be? this is what i think but for some reason i think...
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Please help with optimization problem April 11th 2008, 02:50 PM #1 Newbie Joined Mar 2008 Posts 17 Please help with optimization problem If 2100 square centimeters of material is available to make a box with a square base and an open top, find the largest possible volume of the box. First find an eq...
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Graphs where every two vertices have odd number of mutual neighbours up vote 9 down vote favorite 2 There was a rather cute question last week about graphs where every pair of distinct vertices has an odd number of mutual neighbours. The question was to show that such a graph must have an odd number of vertices, and ...
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Math Help November 3rd 2008, 08:03 PM #1 Member Joined Aug 2008 Posts 225 Sequences A_n = (1 + (3/n) )^4n I don't know hot to find if this converges. I feel like I should break up the exponent, but I don't know how that would help. This uses a couple of neat tricks. Let this limit equal A...
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Curves which do not dominate other curves up vote 13 down vote favorite 3 Let $g>1$ be an integer. Does there exist a (smooth projective) genus g curve $X$ which doesn`t dominate a curve of positive genus and genus smaller than $g$? Surely such curves exist. Just take a curve with simple jacobian. I`m wondering whet...
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how to solve this? Solve: y''=yy'/x And show that y=c3 is a solution of the problem too. where y'=dy/dx How to solve it? The second question is easy: if y is a constant, then both y' and y'' are 0 so the equation becomes 0= 0. Well I have a stab at it that might lead somewhere. But I can't finish it. Perhaps it will ...
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Global Spec and Vector Bundles up vote 0 down vote favorite Can anybody explain why the vector bundle corresponding to a locally free sheaf F is global spec of sym of the dual of F and not just F? How does a section get identified with a polynomial in the dual? ag.algebraic-geometry See en.wikipedia.org/wiki/S...
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integral closures in separable extensions are finitely generated integral closures in separable extensions are finitely generated Theorem 1. Let $B$ be an integrally closed Noetherian domain with field of fractions $K$. Let $L$ be a finite separable extension of $K$, and let $A$ be the integral closure of $B$ in $L$...
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Pn(x) Polynomial fitting November 24th 2012, 09:55 PM #1 Newbie Joined Nov 2012 From Malaysia Posts 2 Pn(x) Polynomial fitting [Hello, out there! I am Samuel. Please, I need your assistance to fit the following set of data points with a polynomial (could be Newtons divided difference polynomial)...
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Yet More Optimization November 15th 2006, 12:46 PM Jacobpm64 Yet More Optimization Find the coordinates of the point on the parabola $y = x^2$ which is the closest to the point (3,0). I'm just wondering if I did this correctly: a point on the curve would be $(x,x^2)$ So, i found the distance betwee...
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Urgent! Need help with Differential Compound Interest Rate Problem! November 7th 2012, 06:22 AM jojoyce Urgent! Need help with Differential Compound Interest Rate Problem! I've been thinking about this problem for an hour and it's due in 2 hours! Find the amount in a savings account after one year if the in...
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Subspace, Basis February 11th 2010, 05:17 PM millerst Subspace, Basis I posted a question, which I have attempted all except for c. Could someone tell me if I did the question correctly? And how do I begin (c). Thanks, there is a PDF file attached. February 11th 2010, 07:07 PM NonCommAlg Quote: in p...
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Are These 2 Linear Equations Correct? November 4th 2012, 01:49 AM #1 Junior Member Joined Oct 2012 From Australia Posts 26 Are These 2 Linear Equations Correct? The First One: 8(5-3x)-4(2+3x)=3 Expansion: -24x -12x 40-8 =3 Combine:-36x 32 =3 Shift: -36x = 3-32= -29 Solution: x= -2...
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Martin Ankerl Dev102.com has a few postings about interesting job interview question. His fifth challenge is this neat task: You are asked to sort a collection of records. The records are stored in a file on the disk, and the size of the file is much bigger than available memory you can work with. Assume a record ...
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Why I hate physics In my next-to-last post on this subject, I left the question hanging in the air: how does a reaction proceed when the Gibb's Free Energy is positive? I am now going to try to answer this. The reaction in question is the decomposition of methane in the presence of CO2: CH4 + CO2 ===> 2CO + 2H2 As I...
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Isomorphism between R-{0} and C-{0} October 14th 2011, 03:51 PM #1 Isomorphism between R-{0} and C-{0} In the exercises of Section 1.6 Dummit and Foote (Abstract Algebra) - Exercise 4 reads as follows: Prove that the multiplicative groups $\mathbb{R}$ - {0} and $\mathbb{C}$ - {0} are not isomorphic. Wou...
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Help finding the general solution September 16th 2010, 03:07 PM Rhode963 Help finding the general solution So I've got to find the general solution to the following differential equation: $(3y^2)y' + y^3 = e^-^x$ I've been hinted that it is a problem that can be put into a form of a Bernoulli equation,...
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Option Pricing Models Option Pricing Models and the "Greeks" Black-Scholes model and the Cox, Ross and Rubinstein binomial model are the primary pricing models used by the software available from this site (Finance Add-in for Excel, the Options Strategy Evaluation Tool, and the on-line pricing calculators.) Both mod...
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Completing a probability table and finding expected value. May 5th 2010, 05:37 AM #1 Member Joined Mar 2010 From Mumbai Posts 91 Thanks 2 16. The manager of a casino plans the following game. Each player will be given a box containing five coins of which one is “gold” (valued Rs 100), one is “silv...
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what is the derivative of r = t squared/8 + 1 ? February 18th 2010, 12:37 AM #1 Newbie Joined Jan 2010 From England Posts 13 what is the derivative of r = t squared/8 + 1 ? Hello, Among my collection of Maths books, I have found a great AS Maths book which is, at last, really clearly explaini...
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Asymptotic evaluation of an integral.. September 18th 2006, 10:30 AM #1 Newbie Joined Sep 2006 Posts 7 Asymptotic evaluation of an integral.. Let be the integral: Int(-oo,oo)dx f(x)exp(iux) I would like to know if there is any method to evaluate it for u-->oo -Stationary phase method:=can'...
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Simplifying differential solutions - cotx e^4x September 18th 2012, 04:09 AM froodles01 Simplifying differential solutions - cotx e^4x Question is f(x) = e^4x cotx Fine, I'll use product rule; dy/dx = V du/dx * U dv/dx Let U = e^4x du/dx = 4e^4x V = cot x dv/dx = -cose^2 x so dy/dx = cotx 4e...
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Discontinuity and Vertical Asymptotes January 29th 2009, 05:47 PM #1 Newbie Joined Sep 2008 Posts 13 Discontinuity and Vertical Asymptotes So I have a problem that I have all parts figured out except for the final part of the question. The function is f(x)=(x^2 - 1) / (2x^2 - 2x). The function ...
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Math Help December 9th 2009, 06:40 PM #1 Junior Member Joined Oct 2008 Posts 43 Subring? Ok. End of semester is up and my professor is pounding new information down our throats in an effort to exhaust the outlined curriculum. We've barely covered definitions of rings, subrings, ideals, etc. We'...
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Math Forum Discussions - Re: PolynomialQuotient slow Date: Jan 2, 2013 9:14 PM Author: Daniel Lichtblau Subject: Re: PolynomialQuotient slow On Monday, December 31, 2012 6:45:13 PM UTC-6, Roman Pearce wrote: > Something seems wrong here with the performance of PolynomialQuotient. Is there blowup because the leading c...
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Posts from September 20, 2011 on Programming Praxis Problem 3 at Project Euler asks the reader to solve this problem: The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143? Given the amount of factoring code on this website, I find that problem quite simple. B...
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Solving Multivariable Diophantine Equations Date: 05/03/98 at 17:32:06 From: Jin Subject: Diophantine equations How would I go about solving this multivariable diophantine equation? x^2 + y^2 - 2xz = 0 For example, I see that (1,3,5) works, but I'd like to know how to solve it. Date: 05/07/98 at 10:54:26 From...
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Evidence from one coin flip Earlier today, on Hacker News someone posted a link to Tom Moertel's blog post "On the evidence of a single coin toss", where he poses a question about probabilities: if he claims he had a perfectly-biased always-heads coin, and you toss it once and it comes up heads, should that sway your ...
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