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Lagrange's Theorem September 24th 2009, 09:23 AM #1 Junior Member Joined Sep 2009 Posts 34 Let G be a group and H a subgroup of G. Define, for a,b elements of G, a is an equivalence relation to b if a^-1b element of H. Prove that this defines an equivalence relation on G and show that [a] = aH = {ah,h...
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definite integral December 5th 2011, 01:15 PM #1 Member Joined Aug 2011 Posts 117 definite integral I would like to think i have a simple problem. Can you see if i am doing it right? $\int_2^{\infty}\frac {2} { v^2 - v }\,dv$ assign b = infinity? Then, bring the 2 to the outside and bring ...
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[SOLVED] High School Quadratic Inequalities October 1st 2009, 09:13 AM unstopabl3 [SOLVED] High School Quadratic Inequalities Q) Use the discriminant 'b^2=-4ac' to solve the following: i) Find the values of ' k ' for which the following equations have two separate roots. a) $kx^2+kx+2=0$ Answer is...
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A delicate elementary inequality up vote 11 down vote favorite 3 The following "piecewise-quadratic" inequality emerged in a joint work of Rom Pinchasi and myself. The inequality is surprisingly delicate, and all our attempts to simplify it made it false. By the end of the day, we were able to prove the inequality, bu...
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Math Forum: Teacher2Teacher - Q&A #5112 View entire discussion [<<prev] [next>>] From: Pat Ballew (for Teacher2Teacher Service) Date: Nov 15, 2000 at 00:53:31 Subject: Re: FOIL Method of multiplying polynomials FOIL is so often used that it seems to be trying to sweep back the tide, but I continue to try to tell te...
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Math Help January 6th 2007, 06:45 PM #1 my teacher give me a problem PRoof that 0.999999........ equals 1 The proof : 0.9999.........=p 9.9999.........=10p 9+0.999.......=10p 9+p =10p 9 =9p p =1 But I still don't believe that 0.99999........................ = 1 Nothing ...
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How to interpret this question September 9th 2013, 06:55 PM #1 Junior Member Joined May 2010 Posts 63 How to interpret this question (induction) I have the following question in my textbook, it appears at the end of a section that talks about Mathematical Induction: Use an induction argument to sho...
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An NP-hard $n$ fold integral up vote 17 down vote favorite 2 We are given rational numbers $[c_1, c_2, \ldots, c_n]$ and $v$ from the interval $[0,1]$. Consider the $n$-fold integral $$ J = \int_{\theta_1 \in I_1, \theta_2 \in I_2 \ldots, \theta_n \in I_n} d\theta_n\ldots d\theta_2 d\theta_1 $$ whose intervals are de...
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Cardinality April 22nd 2009, 02:15 PM #1 Cardinality Let A be a non-empty set. Consider F = {f : A → {0, 1}}, the set of all functions on A with values in {0, 1}. Consider the function g : P (A) → F , B → X_B , where X_B is the characteristic function of the subset B ⊆ A: X_B(a) = 1, if a∈B, and X_B(a) = 0, i...
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2nd Order homogeneous diff equation January 28th 2010, 09:38 AM CorruptioN 2nd Order homogeneous diff equation Hi Guys, I'm having a bit of trouble with a diff equation, I've never dealt with anything quite as complicated as it before and have no idea what to do. I've been given the equation $m x\prime...
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A problem on convex geometry up vote 11 down vote favorite 2 Consider a convex body $K \subset \mathbb{R}^n$ containing the origin in its interior. Although the body is not necessarily symmetric, let us say that two points in its boundary $\partial K$ are antipodal if the origin lies in the segment that joins them. Q...
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Area of an Ellipse without using Calculus Date: 11/28/97 at 11:56:35 From: Vinay Subject: How do you find the area of an oval How do you find the area of an oval? Date: 12/04/97 at 13:13:34 From: Doctor Mark Subject: Re: How do you find the area of an oval Hi Vinay, I'm hoping that by "oval" you mean "ellipse," ...
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eek April 11, 2004 This Week's Finds in Mathematical Physics (Week 205) John Baez This week I'd like to say more about number theory, but first - here's the most fun book on astronomy I've ever seen: 1) James B. Kaler, The Hundred Greatest Stars, Copernicus Books (Springer Verlag), New York, 2002. It's just what t...
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Finding x- and y-intercepts of a parabola. August 1st 2011, 10:00 AM David Green Finding x- and y-intercepts of a parabola. I am asked to use algebra to find the x and y intercepts from the following equation; y = - x^2 + 3x + 8 2 Note; - x^2 above means - x^2 and - 2, I can't get the minus sign in...
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Help with evaluating sine October 10th 2009, 05:26 PM #1 Junior Member Joined Apr 2009 Posts 38 Help with evaluating sine I have the function $f:[-\pi,\pi] \rightarrow R, f(x) = \sin 3(x+ \frac{\pi}{4})$ and I need to find the endpoints by subbing in $-\pi$ and $\pi$ $f(-\pi) = \sin 3(-\pi ...
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Taylor series for multivariable November 5th 2010, 09:20 PM #1 Senior Member Joined Feb 2008 Posts 297 Taylor series for multivariable Find the Taylor series for $f(x,y)=\log(4x-3y)$, up to and including the quadratic terms about the point $P=(1,1)$ Can someone check my working: $f(1,1)=0$ ...
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Showing that a function satisfies an ODE February 22nd 2011, 12:49 PM #1 Newbie Joined Jan 2011 Posts 16 Showing that a function satisfies an ODE Hi, I have the following problem and I am stuck... Thanks for any help you can give me! The problem says: The atmospheric pressure p>0 decreases with...
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Some stuff :P April 19th 2006, 12:42 PM #1 Member Joined Apr 2006 Posts 85 Some stuff :P Like this (Everything in bolded is the questions, and just give the answer. If you have time, steps too, but it is not required) : (Write the following in algebraic expression) Find the sum of the squares o...
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Ciência e Engenharia dos Materiais (CAP06) - Solution Capitulo 06 THE SCIENCE AND... (Parte 1 de 2) 6 Mechanical Properties and Behavior 6–24A850-lb force is applied to a 0.15-in. diameter nickel wire having a yield strength of 45,0 psi and a tensile strength of 5,0 psi. Determine (a) whether the wire will plastical...
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Prime Divisibility Proof March 17th 2011, 02:01 PM #1 Member Joined Nov 2010 Posts 86 Prime Divisibility Proof Let m,n be elements of the Natural numbers. Prove that if m divides n and p is a prime factor of n that is not a prime factor of m, then m divides n/p The following facts can be used: ...
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Explicit indecomposable monomorphism of finitely generated non-indecomposable Abelian groups. up vote 0 down vote favorite This question is a follow-up of the question I asked here. Can you write down an explicit example of a monomorphism of finitely generated Abelian groups which is an indecomposable object in the c...
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Find the basis of kernal and image of a transformation October 31st 2012, 01:55 PM tttcomrader Find the basis of kernal and image of a transformation Suppose that n is a positive integer, and let the transformation $T:C(x) \rightarrow C(x)$ be defined by $T(P(x))=xp'(x)-np(x) \ \ \ \ \ p(x) \in C(x)$ where C(x) ...
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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: Area of circle to its circumference is a constant ...
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Intuition for Levi-Civita connection via Hamiltonian flows MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. A Euclidean metric on a manifold $X$ defines a function on the symplectic space $T^*X$ whose Hamiltonian flow gives ...
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Finding Zeroes April 6th 2010, 01:17 PM #1 Member Joined Nov 2009 Posts 169 Finding Zeroes Let $N \in \mathbb{N}$. Show that for $s \in \mathbb{C}$ the function $f(s) = \sum_{k=0}^N \frac{(-1)^k {N \choose k}}{k+s}$ has no zeroes. I tried, but its hard to see what is the numerator in that case, sinc...
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Driving a car September 5th 2013, 08:34 AM #1 Newbie Joined Sep 2013 From Horten Posts 4 Hey people! I got a problem here I'm stuck on: A car is driving at night along a level, curved road. It starts in the origin, the equation of the road is y = x^2, and the car's x-coordinate is an increasing f...
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Functions holomorphic on a region minus a Cantor set up vote 9 down vote favorite 3 Let $X$ and $Y$ be simply connected open regions of $\mathbb{C}$, and let $Z \subset X$ be a Cantor set. Assume we have a homeomorphism $f$ from $X$ to $Y$, which is holomorphic on $X \setminus Z$. Is $f$ necessarily holomorphic on $X$...
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minimizing squares... August 11th 2008, 04:07 PM #1 Newbie Joined Jul 2008 Posts 19 minimizing squares... Given a triangle $\triangle ABC$ and a straight line $l$, find the point $P$ on $l$ such that $(PA)^2 + (PB)^2 + (PC)^2$ is the smallest. Hello, Let $A_h,\,B_h$ and $C_h$ be the orthogonal p...
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Please Help - Solving, Graphing, and Factoring August 15th 2007, 02:09 PM #1 wonderwall09 Guest Please Help - Solving, Graphing, and Factoring I have 3 algebra problems that I have no idea how to work. It's the beginning of the school year and our teacher gave us a diagnostic worksheet to see what we know, but sh...
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How do you prove that [3,4)~[3,4)\{pi} ? Can anyone provide a proof, plz? I need to understand how the proof works, 10x in advance...(Happy) Let $a = \pi-3$ and let $A = \left\{3+\frac{a}{2^n}\;\middle\vert\; n\in\mathbb{N}\right\}$ where $\mathbb{N}=\{0,1,2,\dots\}$. In particular, $\pi\in A$. Then we can construct ...
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Network Graphs ┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │This is an introduction to Network Graphs, with examples and exercises. The odd-numbered exercises are a...
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Logarithmic Equivalent of the Inverse Hybolic Cosine Function Date: 10/28/97 at 06:58:22 From: Stephen Gurnell Subject: Logarithmic equivalent of the inverse hybolic cosine function Dr. Math, First, thank you very much for your recent help and swift replies. I have recently attempted a question which I think I hav...
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Proof: Recursion Equality February 17th 2009, 08:05 AM #1 Newbie Joined Feb 2009 Posts 3 Proof: Recursion Equality Proofs, doncha love 'um? Anyway, down to business. Define the function Q(n), (n is a Positive Integer) by Q(0)=2, Q(1)=6, Q(x)=6Q(x-1)-5Q(x-2) Prove by Induction Q(n...
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Can models of set theory contain extra ordinals? up vote 7 down vote favorite 3 In the paper "Complete topoi representing models of set theory" by Blass and Scedrov, they consider a general notion of Boolean-valued model of set theory, and one of the conditions they impose is that the model contain "no extra ordinals ...
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Finitely generated Galois groups up vote 12 down vote favorite 6 It is well-known that for a given natural number $n$ there is only finite number of extensions of $\mathbb Q_p$ of degree $n$. This result appears in many introductory books on algebraic number theory. However, these books do not mention that this follow...
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inverse funtions Determine if: f(x) = 1/ x-2 and g(x)= 2x +1/x are inverse functions by computing their composistions. Hi, you get the inverse function if you change the variables. If $f:y=\frac{1}{x-2}$ then the inverse funtion of f is $f^{-1}:x=\frac{1}{y-2}$ $(y-2)\cdot x=1$ $y-2=\frac{1}{x}$ $y=\frac{1}{x}+2$ $y= ...
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Piecewise function of a pyramid surface up vote -1 down vote favorite Can't find it anywhere but I'm looking for a function dependent on x and y that describe any point on the surface of a square pyramid. For example: f(x,y) = 1 if 0 < x < 1-y < 1 0 else Gives me the following surface, the first pictur...
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Some partial derivatives July 28th 2009, 12:46 AM #1 Junior Member Joined May 2009 Posts 39 Some partial derivatives I've been asked to find the partial derivative with respect to x for the function: $<br /> f(x,y) = 2xe^{x+y^2} - e^y + sinh(2x + y)<br />$ I've learnt about treating y as though...
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Archimedes Spiral August 10th 2010, 01:19 PM #1 Member Joined May 2010 From WI - USA Posts 129 Archimedes Spiral Good afternoon, I am working on finding the length of Archimedes Spiral $r=\theta$ for $0\leq\theta\leq2\pi$. I think I may be doing something wrong. This is what I'm getting: $r...
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Two Problems on Tangents Date: 07/09/98 at 21:22:00 From: Kimberly Wah Subject: 2 tangent segments from a point to a circle There are two tangent segments from a point to a circle. Say that the angle that the two tangents form is 80 degrees. How would a person go about proving that the arc closest to the angle forme...
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Algebra help please! September 15th 2005, 09:30 PM #1 Newbie Joined Sep 2005 Posts 2 Algebra help please! I've been having some problems with these, if someone could help that's be nice. Perform the indicated operations and simplify. x^2 - x - 6 x^2 - 3x - 4 x^2 + 4x + 3 * x^2 - 4x + 3 ...
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5 dice probability April 18th 2007, 05:35 PM #1 Newbie Joined Apr 2007 Posts 2 5 dice probability I need to know the fomula to find what the probability of rolling 5 dice one time each and getting a 5 of a kind, 4 of a kind, 3 of a kind, pair, and a straight. I believe the forumula for 5 of a kind is...
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Determining Cone's Original Dimensions from a Slice Date: 05/18/99 at 11:33:33 From: Mike Branson Subject: Truncated cones revisited Dr. Math, You have helped us tremendously with the truncated cone problem I presented you several weeks ago. Thank you. I have another question for you along the same lines...
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Determin an equation from a rational fucntion graph March 24th 2009, 06:25 AM jepal Determin an equation from a rational fucntion graph Please Help!! Basically the graph is showing: vertical asymptote (V)on x=3 and horizontal asymptote(H) on x=2 and a point in the graph (1.5,0) So this is ...
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Gaussian processes, sample paths and associated Hilbert space. up vote 8 down vote favorite 3 Given a Gaussian process on some topological space $T$, with a continuous covariance kernel $C(\cdot,\cdot)\colon T\times T\to R$, we can associate a Hilbert space, which is the reproducing kernel Hilbert space of real-valued...
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Chapter 4 Newton's Laws Chapter 4: Newton's Laws Forces  We are now concerned with the causes of motion (dynamics)   Force ( F or F ): an action exerted on an object which may change its state of rest or motion.  Examples: o Push o P...
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Posers and Puzzles : 12 Marbles Original post by Hegemon , 21 May '05 23:12 1. A Lost Bobby London Joined : 21 Sep '04 Moves : 18171 2. Originally posted by Hegemon There are 12 marbles al...
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Two-Variable Data Analysis Multiple Choice Practice Problems for AP Statistics By Duane C. Hinders — McGraw-Hill Professional Updated on Feb 5, 2011 Review the following concepts if necessary: Problems 1. Given a set of ordered pairs (x, y) so that s[x] = 1.6, s[y] = 0.75, r = 0.55. What is the slope of the lea...
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exact equationtype of differential equation that can be solved directly without the use of any of the special techniques in the subject. A first-order differential equation (of one variable) is called exact, or an exact differential, if it is the result of a simple differentiation. The equation P(x, y)y′ + Q(x, y) = 0 ...
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Definition of a Tensor Date: 05/20/2001 at 10:00:41 From: M Innes Subject: Clear concise definition of a tensor If a vector can be described as "any quantity having magnitude and direction" why can't a tensor be defined as "any..." in just a couple of lines? Many thanks. Date: 05/20/2001 at 17:32:42 From: Doctor ...
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Solving a square equation? March 15th 2011, 01:31 PM #1 Hi! I´m doing maths at the moment and I´m having trouble solving the following question: 4 (x+7)^2 = 36 I started of by just taking the root of both so it became: 2 ( x + 7) = 6 And now I don´t know what to do, I´m trying to solv...
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(A)periodicity and (In)dependence on the boundary condition for optimization problem related to ODE up vote 2 down vote favorite The question is pair to MO117505 and translates some problem on error-correction codes to similar problem about differential operators. (See also If “force” is periodic does it imply “veloci...
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Finding values of b November 29th 2010, 07:10 AM #1 Finding values of b Not sure if this post should go here so if it would be better else where would a Mod please move this Here is the question i am working on and it seems simple enough but i just wanted a second opinion For what value(s) of b is $b^a$...
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tis question is so confusing.hu can solve? xiaoz (a)The arc lamp to the shadow, and the man's head to the shadow form two similar triangles. The ratio of height to base for the man's triangle is $\frac{1.8}{2.5}$ The ratio of height to base for the arc-lamp triangle is $\frac{x}{10+2.5}$ Because the triangles are simil...
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Calculating Height in the Air Date: 11/14/2001 at 17:16:31 From: Bobby Weidner Subject: Math I need to know the formula for calculating the height of an object, like how high in the air the object is. Date: 11/17/2001 at 22:52:30 From: Doctor Jeremiah Subject: Re: Math Hi Bobby, I learned how to do this when I w...
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Negative Average Growth Rate October 22nd 2012, 04:04 PM #1 Newbie Joined Oct 2012 From PA Posts 3 Need someone to check my math. I followed the formula for average growth rate in the post here. I have five years of data. The values for the first and last years are: 2007: 1,292 2011: 1,097 ...
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Posts from October 2011 on Math Jokes 4 Mathy Folks Archive for October, 2011 On Mischief Night, I spent a long time explaining our Halloween decorations to my neighbor. But I understood why he was confused. After all, they didn’t look like Halloween decorations. There was the WITCH of Agnesi taped to our front door…...
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long trigo integral: August 2nd 2007, 06:57 PM #1 Senior Member Joined Jul 2006 From Shabu City Posts 381 long trigo integral: $\int {\csc^5{x}}dx$ Solutions: $\int {\csc^3{x}}(1+\cot^2{x})dx$ $\int {\csc^3{x}}dx + \int {\cot^2{x}}{\csc^3{x}}dx$ solving for int of $\int {\csc^3{x}}...
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How do you calculate a Riemann sum involving square roots? January 30th 2010, 01:45 PM #1 Super Member Joined Nov 2008 Posts 597 How do you calculate a Riemann sum involving square roots? I know how to calculate Riemann sums however whenever there is a square root involved with the sigma notation, I am c...
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Structured Finance Cash Flow Collateralized Debt Obligations Advanced Financial Economics Introduction Econ 426 Discussion Outline Course Mechanics - Learning Objectives - Course Outlin...
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Factoring a 3-Variable Polynomial Date: 08/13/99 at 06:01:33 From: Daniel Baumgartner Subject: Factorization in complex field Is it possible to factor the polynomial k1*x^2 + k2*y^2 + k3*z^2 + k4*xy + k5*xz + k6*yz into (g1*x + g2*y + g3*z)(h1*x + h2*y + h3*z) over the complex field for every choice of...
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Vectors and Planes February 13th 2013, 02:29 AM #1 Junior Member Joined Nov 2012 From United Kingdom Posts 28 Thanks 1 Vectors and Planes I apologize if this isnt in the right place, my actual subject is mechanics. I've know how to do some of this question but stuck on other parts. Consider ...
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Hoping I'm getting the hang of this: ∫∫ x^2 + 3y^2 July 20th 2008, 03:50 PM #1 Junior Member Joined Jul 2008 Posts 51 Hoping I'm getting the hang of this: ∫∫ x^2 + 3y^2 z=x^2 +3y^2 ; x=0, y=1, y=x, z=0 I drew a diagram and figured out that y should be between 1 and x From the diagram, it looks ...
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Complex Numbers January 16th 2008, 09:35 PM OzzMan Complex Numbers I need to find the rectangular form of i ^ (-3) + i ^ (-2) i = imaginary number The answer in my book says -1 + i but i do not know how they got it January 16th 2008, 09:40 PM mr fantastic Quote: $i^{-3} = \frac{1}{i^3} = \fr...
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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: Product, Filters and Quantales Replies: 31 Last Po...
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Double Integration with polar co-ordinates February 18th 2010, 09:37 AM #1 Newbie Joined Feb 2010 Posts 8 Double Integration with polar co-ordinates Let D be the disk of radius 6 centered at the origin. Find the double integral of the function f (x, y) = e^(x^2 +y^2) over D When I do this i get ...
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Schrodinger's equation over a randomized grid up vote 4 down vote favorite 1 I am interested in solutions to $$ \frac{d}{dt} \Psi = -iH \Psi $$ for $H$ hermitian and time independent. This boils down to evaluating $$ \Psi(t) = e^{-iHt}\Psi_0 $$ at points of interest $t_n$. I want to quickly compute $\Psi(t)$ up to a l...
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quick differentiation question about sin^2(x) June 24th 2010, 08:04 AM #1 Newbie Joined Jun 2010 Posts 10 quick differentiation question about sin^2(x) Ignorant question here, but I was looking at this example i have, needing to take the derivative: f'(x) = sin^2(x) + cos(x) = 2sin(x)*d/dx(sin x...
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Semicircle and isosceles problem March 11th 2010, 12:44 PM josephk Semicircle and isosceles problem A semicircle and an isosceles triangle have the same base and the same area. Find the two identical angles of the isosceles triangle. March 11th 2010, 01:33 PM TKHunny What have you done? What do you know a...
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Effective Nuclear Charge Java Security Settings: This web page employs Java, which requires specific security settings for correct operation. If the applets on this page do not run correctly, consult the Virtual Chemistry Experiments FAQ or the Physlet Physics web site for establishing the correct security settin...
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Proving that limit of sequence does not exists April 7th 2013, 02:29 PM #1 Newbie Joined Mar 2013 From . Posts 3 Proving that limit of sequence does not exists Hello, I have some probelm regarding my homework. I proved that the sequence $(-5)^{n}$ doesn't have limit and now I need to prove ...
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Inverting a power series? ... Cornish Fisher up vote 0 down vote favorite 1 Hello In the derivation of the cornish fisher expansion, the following equation is obtained: $$ \sum_{n=2}^{\infty} b_n H_{n-1}(x_\alpha) = \sum_{j=1}^{\infty}\frac{(x_\alpha - z_\alpha)^j}{j!}H_{j-1}(x_\ alpha), $$ where $H_n(x)$ are the Her...
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Confidence in temperature May 25th 2011, 04:18 AM #1 Newbie Joined May 2011 Posts 2 Using column temp, we can compute the sample mean temp = 19:74, sample size = 150 and the sample standard deviation stemp = 6:035. (a) Construct a 91% confidence interval for the population mean of temp. ...
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finding x December 14th 2010, 07:09 AM tysonrss finding x 2(3x + 4) = 4x + 16 find x 2y = 1/2(3y + 5) find y d + 2 = 1/2(4d - 6) find d 4q - 2 = 2(3q - 6) find q Can someone offer help? December 14th 2010, 07:10 AM e^(i*pi) The Distributive law is used here. Can you expand the brac...
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Homework Help Posted by rachel on Saturday, March 3, 2012 at 8:31pm. Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same lon...
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limits and continuity November 24th 2005, 12:39 AM freya81 limits and continuity 1a)Do these functions have limits.If the limit exists, find it with justification, if not explain why not i) f(x,y) =x²-y²/x²+y² ii) f(x,y) =x³-y³/x²+y² iii) f(x,y) =xy/|x|+|y| iv) f(x,y) =1-√(1-x²)/x²+ xy+y² v...
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Seating People in a Row Date: 12/16/95 at 18:58:1 From: Anonymous Subject: Permutation and Combination Find the numbers of ways in which 4 boys and 4 girls can be seated in a row of 8 seats if they sit alternately and if there is a boy named John and a girl named Susan amongst this group who cannot be put in adjacen...
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expected value of positive discrete RV April 25th 2009, 08:22 PM #1 Junior Member Joined Jun 2008 Posts 38 Thanks 1 expected value of positive discrete RV I'm required to show that if $X\geq 0$ then $\sum_{n=1}^{\infty}\mathbb{P}(X\geq n) \leq \mathbb{E}[X] \leq 1 + \sum_{n=1}^{\infty}\mathbb{P}(X\ge...
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Limits Help September 11th 2008, 03:49 PM sleepiiee Limits Help 1.) lim as x--> infinity (x - cube root of x) 2.) lim as x-->0+ ln(2x) Anyone know how to solve these limit equations? Thanks. September 11th 2008, 04:10 PM mr fantastic September 11th 2008, 04:18 PM skeeter $x - x^{\frac{1}{3}} =...
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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: Algebra 1 the vos Savant way Replies: 0 Algebr...
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Newton's Method and Continued Fractions Date: 10/06/1999 at 01:58:37 From: Robert Kaluhiokalani Subject: Comment about sqrt() and Decimal to Fraction Conversion Dear Math Doctors, First, in the response given to 'Square Roots Without a Calculator' http://mathforum.org/library/drmath/view/51890.html I was intri...
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linear transformation/linear combination question April 28th 2013, 08:14 AM flametag3 linear transformation/linear combination question Let B = { $u_1, u_2, u_3$} and B' = { $v_1, v_2, v_3$} Be the two bases for $R^3$ given that the transition matrix from B' to B is P = $\begin{bmatrix}1 & -1 & 2\\0...
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integral of inverse hyperbolic September 5th 2010, 09:37 PM shadow85 integral of inverse hyperbolic I have to find the integral of (x^2)(arccothx) dx I have used integration by parts with u = arccothx du = 1/(1-x^2) dv = x^2 v = 1/3*x^3 which i get: (1/3)(x^3 * arccothx) - integral...
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si PathScan - the Path-Scan significance test for mutations in groups of putative cancer genes use PathScan; my $pmobj = PathScan->new ($list_of_gene_lengths); my $pval = $pmobj->path_scan ($actual_hits, $background_mutation_rate); This package calculates the so-called path-scan statistic P-v...
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Positive integer not divisible by 7 January 14th 2011, 06:02 AM Hellbent Positive integer not divisible by 7 Hi, Is there a simple explanation for this? The positive integer $n$ is not divisible by $7$. The remainder when $n^2$ is divided by 7 and the remainder when $n$ is divided by $7$ are each equa...
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quick question... January 22nd 2011, 07:06 AM #1 Senior Member Joined Aug 2009 Posts 349 quick question... well actually i have two quick questions. i am doing a problem and i wanted to make sure my thought process was correct. 1. when you have an integral, lets say inside the integral is 3*e^((1/2)...
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combing terms in summation calculating beta hat zero October 8th 2013, 05:52 PM kingsolomonsgrave combing terms in summation calculating beta hat zero Attachment 29417 What happend here? when I manupulate it so that xbar squared is the sum of xi squared and the n goes in the denominator I still have sig...
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[SOLVED] Expressing in the form? Hello, Mark! Quote: Express $\sqrt{44-24\sqrt{2}}$ in the form $a + b\sqrt{2}$ $\text{We have: }\;\sqrt{44-24\sqrt{2}} \;=\;a + b\sqrt{2}\;\;\text{ where }a\text{ and }b\text{ are rational numbers.}$ Square both sides: . $44 - 24\sqrt{2} \:=\:(a+b\sqrt{2})^2 \:=\:a^2 + 2ab\sqrt{2} + 2b^...
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Does the Monoid Axiom hold for k-spaces? up vote 7 down vote favorite 1 In “Algebras and Modules in Monoidal Model Categories” Schwede and Shipley introduced the monoid axiom. If a cofibrantly generated monoidal model category $M$ satisfies this axiom and some smallness hypotheses, then the category $Mon(M)$ of monoid...
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Math Forum Discussions Re: problem on record-breaking values in probability Posted: Mar 1, 2013 2:10 AM On 02/27/2013 10:24 PM, David Bernier wrote: > On 02/27/2013 04:05 PM, James Waldby wrote: >> On Wed, 27 Feb 2013 07:10:08 -0500, David Bernier wrote: >>> On 02/27/2013 05:49 AM, David Bernier wrote: >>>> On 02/27/2...
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first partial derivatives February 17th 2009, 02:00 PM #1 Member Joined Nov 2005 Posts 172 first partial derivatives Find the first partial derivatives of $f(x,y) = \frac{2x-4y}{2x+4y}$ at the point (x,y) = (2, 2). \frac{\partial f}{\partial x}(2,2) =__ \frac{\partial f}{\partial y}(2,2)=__ ...
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Homework Help Posted by Linda on Thursday, April 17, 2014 at 8:45pm. How do I solve these inequalities: e^3x>e^x-1 -6log (subscript of 4) x > -24 & how do I solve these: 8^x+1=3 e^x+2=50 8logx=16 I really don't understand how to solve these so can someone please explain them to me? • Algebra 2 - Reiny, Thurs...
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Two very irritating area problems. (polar, and restricted area) May 24th 2010, 06:43 AM reaz Two very irritating area problems. (polar, and restricted area) hi guys 1. A curve is given in polar coordinates of r = cos ^ 2 fi , 0 <= fi <= 2 pi How big area does the place/area have which is enclosed by the...
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Please tell me why? December 5th 2006, 12:27 AM #1 Member Joined Nov 2006 Posts 123 If U= <-3,-2,2> and V=<-2,2,3> , then Why U X V = <-10,5,-10> ? Would you please explain to me by showing its working steps? Thank you very much. Note : U and V are vectors. If $V_1 = (a_1,\ b_1,\ c_1)$ and ...
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Trying to work through a Fibonacci problem using Binet's Formula August 5th 2012, 08:22 PM #1 Newbie Joined Aug 2012 From Salem, Oregon Posts 10 Trying to work through a Fibonacci problem using Binet's Formula I am trying to show that the square of any Fibonacci Number differs by one from the product...
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Sum Equals Product up vote 3 down vote favorite Sum Equal Product There are many articles in re this issue on the Web, although many are restricted to special cases (e.g., John Cook’s sum of tangents = product of tangents), and even some involving mixed numbers. There is one excellent article in re: sum equal produc...
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Please help! January 2nd 2008, 10:12 AM #1 Junior Member Joined Oct 2007 Posts 30 x/4 + y/3 = 1 and (x^2)/16 + (y^2)/9 = 1 intersect at points A and B. Find the coordinates of a third point C on the graph of the second curve such that the area of triangle ABC is equal to 3. Thank you very much for ...
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Analysis: Absolute Continuity & Differentiation April 21st 2010, 11:09 AM southprkfan1 Analysis: Absolute Continuity & Differentiation Let A $\subset$[0, 1] be a Borel set such that 0 < m(A $\cap$ I) < m(I) for all interval I $\subset$ [0, 1]. Let F(x) = m([0, x] $\cap$ A), where m is lebesgue measure. Show ...
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[ 0.06201171875, 0.01904296875, 0.01422119140625, -0.04931640625, 0.048095703125, 0.005035400390625, 0.09765625, 0.1103515625, -0.01007080078125, 0.0087890625, 0.0159912109375, -0.0235595703125, 0.1298828125, 0.006988525390625, -0.045166015625, -0.0150146484375, 0.0791015625, -0.0101...
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Parametrization of the curve January 30th 2013, 11:05 PM happymatthematics Parametrization of the curve Attachment 26774 please read the question above. I don't know what I'm doing. x^2+y+1-xy=2 x^2-1+y-xy=0 (x-1)(x+1)-y(x-1)=0 (x-1)(x+1-y)=0 . . oh... can't find any clue ...
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[ -0.0615234375, -0.00156402587890625, -0.053955078125, -0.015869140625, 0.01031494140625, -0.00811767578125, 0.029052734375, 0.031494140625, -0.0986328125, -0.01116943359375, 0.0654296875, 0.01019287109375, 0.035400390625, 0.03515625, -0.04931640625, -0.0255126953125, -0.08203125, -...
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Float Precision–From Zero to 100+ Digits How much precision does a float have? It depends on the float, and it depends on what you mean by precision. Typical reasonable answers range from 6-9 decimal digits, but it turns out that you can make a case for anything from zero to over one hundred digits. In all cases in t...
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[ -0.027587890625, 0.03173828125, -0.1298828125, -0.08837890625, -0.08056640625, -0.0225830078125, -0.0185546875, 0.0869140625, -0.0218505859375, 0.0140380859375, -0.002410888671875, -0.0498046875, -0.00079345703125, 0.053466796875, -0.050048828125, -0.11376953125, -0.033447265625, -...
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