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Cylinder Problem October 11th 2011, 10:49 PM #1 Newbie Joined Oct 2011 Posts 1 Cylinder Problem I have a maths question that I can't solve. It reads as follows: "A small cylinder is placed on the top of two identical cylinders, which are touching each other as shown in the diagram. Find the radius o...
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sum prove If $U_n=\frac{1}{(2n+1)(2n+3)}$, prove that $<br /> U_{n-1}-U_n=\frac{4}{(2n-1)(2n+1)(2n+3)}<br />$ Thanks . $U_n = \frac{1}{(2n+1)(2n+3)}$ $u_{n-1}$ is the point when considering a value one less than $n$ thus the expression is found (for $n-1$) when we substitute $n=n-1$. $U_{n-1} = \frac{1}{(2(n-1)+1)(2 (...
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Equation Of A Tangent Q October 6th 2008, 11:15 AM #1 Newbie Joined Oct 2008 Posts 4 Equation Of A Tangent Q ok so here's the Q i am stuck on 1) Find the equations of all tangents to the graph of f(x) = x^2 - 4x + 25 that passes through the origin (0,0) so from my understanding, the tangent lin...
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problem of power series July 4th 2008, 08:26 PM #1 Newbie Joined May 2008 Posts 11 problem of power series 1)Prove that 1)1+ 1/2! + 1.3/4! + 1.3.5/6! + ……………………=e^1/2 2) 2) Evaluate the series 1 + 3/1! + 5/2! + 7/3! + ……………………………. Both problems rely on you using the power series $e^x = 1...
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Fatoring polinomials - what am I doing wrong? March 11th 2011, 06:43 PM Eloise1995 Fatoring polinomials - what am I doing wrong? Hi! Here is the problem I was trying to solve, and what I did: 3x^2+7x-6=0 Since 3*(-6)=-18, I need two numbrers, the product of which is -18, and the sum of which is 7. I cho...
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An Explanation of Pascal's Triangle Date: 27 Feb 1995 22:57:04 -0500 From: Anonymous Subject: Probability and Pascal's Triangle My 10th grade daughter is having trouble finding a simple explanation of Pascal's Triangle and its application. So far we've discovered that, in lieu of prozac, Pascal turned to math and c...
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Is lim R_i = O(colim Spec R_i) true for finite (co)limits? up vote 2 down vote favorite 4 $\DeclareMathOperator{\colim}{colim} \DeclareMathOperator{\Spec}{Spec}$ [Edit1] I should point out that the colimits below are in the category of schemes, since the statements are trivially false for colimits in the category of ...
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Global dimension of quantum $\mathbb{P}^{n}$ up vote 3 down vote favorite 2 Let $k$ be a field. Given a (not necessarily commutative) $k$ graded ring $A$, M. Artin and J.J. Zhang introduced a notion of "noncommutative projective scheme" $Proj(A)$ in this paper. It is defined as a $k$-linear abelian category $$ Tails(A...
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range projection of an unbounded idempotent affiliated to a finite von Neumann algebra up vote 4 down vote favorite To be slightly more precise: let $M\subset B(H)$ be a finite von Neumann algebra equipped with a faithful normal trace $\tau$, and let $L^0(M,\tau)$ be the completion of $M$ in the measure topology; this...
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When to use which? August 11th 2007, 09:33 PM wby When to use which? if 5 card are dealt from 52 cards, determine the probabilty of getting 3 red cards and 2 black face cards. The answer is 26C3(6C2)/52C5, but I got 52C5(1/2)^5(6/52)^2, how do you know when to use which? Thank you! August 12th 2007, 0...
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tricky integral February 21st 2011, 02:35 PM #1 Member Joined Oct 2010 Posts 76 tricky integral what do i do here? S 1/2sin^2(x) dx the S is meant to be the integrate zigzag thing so its integrate 1/2sin^2(x) dx? i am lost. i calculated the answer to be 1/2tan(x) using software but i don't get ...
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optimzation problem # 10 August 15th 2009, 06:07 PM skeske1234 optimzation problem # 10 a rectangle is inscribed under the curve y=e^(-x)^2, with its base along the x-axis. Find the rectangle of largest area, subject to the restriction that the base does not exceed 4 units. Now I want to maximize the area o...
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Secondorder Differential equation April 26th 2009, 02:01 PM #1 Secondorder Differential equation Aloha! I have given an inhomogen DE as: $<br /> n>=1$ $X_{n+2}-X_{n+1}+\frac{1}{4}X_{n} = n+4$ Trying to find the general $X^h_{n}$ solution to the associated homogen DE and the special solution $X^...
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solve a trigonometric equation November 10th 2009, 03:38 PM #1 Junior Member Joined Sep 2009 Posts 74 solve a trigonometric equation could I get some assistance solving this equation? I'm afraid I'm just not getting anywhere with it $secx + cosx = -2$ using identities, I can turn that into ...
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trigonometric March 1st 2006, 11:56 PM xavior trigonometric To confirm 1. 5 + sin^2 A=sinA + 5 2. cos^4 A-sin^4 A=cos2A 3. cos^2 A (2tan^2 A + sec^2 A)= 2-cos2A March 2nd 2006, 01:40 AM ticbol Quote: Originally Posted by xavior To confirm 1. 5 + sin^2 A=sinA + 5 2. cos^4...
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Follow-up: Sampling a discrete distribution This is a follow-up to my last post, on a puzzle about "Sampling a discrete distribution" (see my comment there for the solution I originally thought of). As an anonymous commenter (Rex?) points out, a nice elementary solution that has been known for a long time. I admit to...
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Math Help Evaluate $<br /> <br /> \lim_{x\to0} \frac {(e^x)^2-1-x^2-\frac {x^4}{2}}{cosx-1+\frac {x^2}{2}-\frac {x^4}{4!}}<br />$ Thanks. Last edited by khatz; August 3rd 2009 at 06:12 PM. When you take this limit the way it is, you end up with the indeterminate case $\frac{0}{0}$ So you can now apply L'Hôpital's ru...
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Morphisms between tensor functors Todd Trimble Morphisms between tensor functors MathOverflow User Auguste Hoang Duc asked after a proof of proposition 1.13 in Tannakian Categories by Deligne and Milne, to the effect that given two rigid tensor categories $C$, $D$, the category $ [C, D]$ of tensor functors and morphis...
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constrained optimisation problem May 14th 2010, 06:46 PM lin.13579 constrained optimisation problem (a) Write down the objective function and the constraint equation for aconstrained optimisation problem which is to minimize the total surface area of a rectangular box with the constraint that its volume is f...
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Need help factoring November 19th 2009, 06:58 PM #1 Newbie Joined Nov 2009 Posts 4 Need help factoring Hi I was wondering if anyone could help me with this equation i have, im trying to factor this in my ti92+ calculator and im not seeing the textbook result my book shows. Im told to factor this ...
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under standing metric spaces and cauchy sequences... (analysis/topology) April 8th 2008, 05:10 PM #1 Member Joined Apr 2008 From Seoul, South Korea Posts 128 under standing metric spaces and cauchy sequences... (analysis/topology) hmm so i have this metric defined by x,y in R^k such that d_1(x,y)=max...
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integral test problems April 9th 2007, 09:38 AM #1 Senior Member Joined Jan 2007 Posts 477 integral test problems these problems use the integral test, I appreciate any help you can offer me with these ones. Thankyou. heres the equations, there are three of them: http://img127.imageshack.us/img127/9...
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Pareto - a ranking tutorial Zipf, Power-laws, and Pareto - a ranking tutorial Lada A. Adamic ...
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Probabilty of choosing 5 defective buses June 19th 2010, 03:46 PM #1 Probabilty of choosing 5 defective buses Shortly after being put into service, ssome buses manufactured by a certain company have developed cracks on the underside of the main frame. Suppose a particular city has 25 of these buses, and crack...
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Math Help March 15th 2007, 12:16 PM #1 Junior Member Joined Feb 2007 Posts 44 climber The surface of mountain is modeled by the equation h(x,y)=5000 -0.001x^2-0.004y^2. A mountain climber is at the point (500, 300, 4390). In what direction should the climber move in order to ascend at the greatest r...
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Precise definition of limits September 3rd 2007, 06:22 AM fruitcakelover Precise definition of limits Does anyone knows how to show: limit of f(x), x approaches a, equals L if and only if limit of f(x), x approaches a from the right = to limit of f(x), x approaches a from the left = L Using t...
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Finding the nth derivative February 6th 2011, 09:23 AM joatmon Finding the nth derivative Find the nth derivative of $f(x) = x^n$ by calculating the first few derivatives and observing the pattern that occurs. So, here's what I've done so far: $f'(x) = nx^{x-1})$ $f''(x) = n(n-1)x^{n-2}$ $f''(...
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Chi Square Test of Independence with MS Excel - ASP Free Chi Square Test of Independence with MS Excel One of the most important aspects of any type of research that includes surveys and scientific experiment is having an “unbiased” form of decision. Only when you arrive at an unbiased decision can your research be co...
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quadratic equation by factoring March 6th 2010, 09:09 PM likewhoa quadratic equation by factoring 2xsquared + 19x + 24 = 0 can someone help me with this question I need some kind of direction. Im thinking you have to multiply the 2squared with the 24 and try to come up with 2 numbers that would equal to 19?...
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Math Help Is it true that $\sum_{n=1}^{\infty} {a_{n}}^2$ is convergent if $\sum_{n=1}^{\infty} {a_{n}}$ is convergent? Justify your answer. Any hints? Remember that if $\vert a \vert \leq 1$ then $a^2 \leq \vert a \vert$. Now also remember if the series is convergent what is $\lim_{n \to \infty} \ a_n$? Although now...
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Scientific Papers - Vi 1913] LAMINAR MOTION OF AN INVISCID FLUID 201 from the second of which we may infer that if q be finite, p+ U must change sign, as we have already seen that it must do when q — 0. In every case then, when k is small, the real part of n must equal ...
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Differential Equations-Separation of variables February 5th 2008, 05:44 PM yellowrose Differential Equations-Separation of variables I need some help with this problem please: solve by separation of variables. dydx=y(1-y^2) 1/(y(1-y^2)dy=dx How do I get it into y= form after taking the integr...
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[SOLVED] 2 questions April 21st 2009, 11:08 PM noob mathematician [SOLVED] 2 questions Let X be the number of 1's and Y the number of 2's that occur in n rolls of a fair die. Compute Cov(X,Y). Do I use $Cov(X, Y)= E[XY] -E[X]E[Y]$? A fair die is rolled. Let X and Y denote, respectively, the number of r...
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More Linear Algebra: Finding Orthonormal Bases Many students who take linear algebra courses at university, often forget they were likely exposed already to many of its concepts and principles ...but in a different guise or a different subject. Take, for instance, the concept of an "orthonormal basis". The term soun...
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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: Auto composition yields exponential Replies: 5 Las...
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Log Questions January 27th 2008, 11:26 AM #1 Newbie Joined Jan 2008 Posts 18 Log Questions Hi, I'm needing help with solving two equations using logarithms: 1) 15000=702.712(1.067)^x I know by "plugging and chugging" into x, the it's somewhere around 48. However, I'd like to know how to so...
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Difference between Standard Deviations? September 12th 2011, 11:59 AM Niles_M Difference between Standard Deviations? Hi In some of my statistics books, they use two versions of the standard deviation for a data set {x} with N measurements. The first version is $<br /> \sigma^2 = \frac{1}{N}\sum_i{(x_i...
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Non-cohomological proof that the pullback of an ample bundle by a finite morphism is ample up vote 5 down vote favorite 2 It is a standard fact that for any finite morphism of proper Noetherian $A$-schemes ($A$ being Noetherian), the pullback of an ample line bundle is ample. The usual proof of this fact is via Serre'...
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fractional part and integration January 6th 2010, 08:27 AM Shanks fractional part and integration Let $\{x\}$ be the positive fractional part of real number $x$, for example, $\{\pi\}=0.1415926...$ . Prove that the set $S=\{\{nv\}:n\in Z^+\}$ is dense in [0,1] if $v$ is positive irrational number. And f...
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3.2 Channel Expansions and Contractions [Next Section] [Previous Section] [Table of Contents] Full Equations Utilities (FEQUTL) Model for the Approximation of Hydraulic Characteristics of Open Channels and Control Structures During Unsteady Flow U.S. GEOLOGICAL SURVEY WATER-RESOURCES INVESTIGATIONS REPORT 97-4037 3....
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Math Forum Discussions W^3 Posts: 29 Registered: 4/19/11 Re: Matrices of rank at least k Posted: Nov 29, 2012 1:15 PM Let S = {a in R^k : |a| = 1}. Suppose u_1, ..., u_k are linearly independent in R^m. Then for all a in S, |sum a_ju_j|> 0 (the sum will always be over j in {1, ..., k}). By continuity and compactness,...
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Simultaneous non-linear equations. {5xy(x² + y²) = -160 {x² + 5xy +y² = -12 ??? Last edited by mr fantastic; September 19th 2011 at 07:28 PM. Reason: Re-titled. What do you have to do? Solve the system? ... The first thing I noticed is that you recognize two equal parts in both equations, the $5xy$ part and $x^2+y^2...
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Finding the capacity July 21st 2012, 03:27 PM donnagirl Finding the capacity Two oil tanks,X and Y, have the same capacity. The amount of oil in tank X is 1/2 of its capacity, and the amount of oil in tank Y is 1200 gallons less than its capacity. If there are 7800 gallons of oil in the two tanks combined, w...
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Finding a and b (derivatives) November 30th 2008, 04:46 AM #1 Newbie Joined Nov 2007 Posts 23 Finding a and b (derivatives) What are the values that a and b can take so that f(x)= ax^2 + bx -sin3x has a local maximum when x=0 ? Thanks in advance To have a local max at zero $f'(0)=0$ and $f...
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Find eigenvalues and eigenvector November 26th 2011, 12:37 PM #1 Junior Member Joined Apr 2010 Posts 58 Find eigenvalues and eigenvector I am to find the eigenvalues and corresponding eigenvectors of the following matrix: [3 -1 -1] [-12 0 5] [4 -2 -1] Here is what I have so far: det...
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Disquisitiones Mathematicae Posted by: matheuscmss | June 24, 2014 Dynamics of the Weil-Petersson flow: proof of Burns-Masur-Wilkinson ergodicity criterion II Last time, we showed the first part of Burns-Masur-Wilkinson ergodicity criterion: Theorem 1 (Burns-Masur-Wilkinson) Let ${N}$ be the quotient ${N=M/\Gamm...
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Trig substitution calc 2 October 1st 2010, 07:15 PM highc1157 Trig substitution calc 2 Dear MHF experts (btw, you guys rock!! lol), $\displaystyle \int \frac{x^2}{\sqrt{25-x^2}}\,dx$ (someone else's calculations for this, last step is correct, i took the derivative and it equals the original integral) ...
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False identity? May 2nd 2010, 02:14 PM #1 Junior Member Joined Jan 2010 Posts 66 False identity? Hello, all! I need to prove the following identity: $\frac{cos(x-y)}{sin(x-y)} = \frac{1 + tan\hspace{5 pt}x\hspace{5 pt}tan\hspace{5 pt}y}{tan\hspace{5 pt}x + tan\hspace{5 pt}y}$ I am able to ...
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Complex Analysis: Maximal Modulus Principle question September 12th 2011, 11:17 AM #1 Newbie Complex Analysis: Maximal Modulus Principle question Re: Complex Analysis: Maximal Modulus Principle question I've been thinking of this problem but I just can't complete a proof, here's a possible route (hopefully) tow...
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Strategies for the Math Section Brightstorm is like having a personal tutor for every subject See what all the buzz is about Check it out Strategies for the Math Section 1,450 views So the math section of the PSAT also causes a lot of anxiety with students. So what I’ve done is, I’ve moved over here to the math lab...
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quadrilateral with vertices Determine the area of the quadrilateral whose vertices are (1,3), (6,5), (9,1) and (3,-3). Maybe you can use this method: http://www.mathhelpforum.com/math-he...ngle-help.html See post #4. $\dfrac{1}{3} \text{ : } \dfrac{6}{5} \text{ : } \dfrac{9}{1} \text{ : } \dfrac{3}{-3} \text{ : } \df...
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Need help solving this word problem.. Implicit Differentiation? October 22nd 2008, 04:10 PM Manizzle Need help solving this word problem.. Implicit Differentiation? I believe this problem needs to be solved using implicit differentiation, but i am not sure how to set the problem up.. any help is greatly apprecia...
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Divergence Theorem limits May 2nd 2011, 06:26 AM adam_leeds Divergence Theorem limits F = 2xz i + yz j + ${z}^{ 2}$ k over the upper half of the sphere ${x}^{2 } + {y}^{2 } + {z}^{2 } = {a}^{ 2}$ I thought it was dz d\theta z between a and 0 and \theta between \pi and 0 , but im wrong (Crying) May 2nd 2011...
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Definition of determinant and connection to linear dependance of columns July 12th 2011, 10:14 PM #1 Newbie Joined Jun 2011 Posts 7 Definition of determinant and connection to linear dependance of columns Hi, In my book on linear algebra (first year university) the author starts off explaining the c...
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Prove that n^2 - 1 September 14th 2010, 03:09 PM dblaisewatson Prove that n^2 - 1 Hey everyone, I have this problem for homework and got started on it when n is odd (easy). But can't figure out how to solve it when n is even: Let n be an integer greater than or equal to 3. Prove that n^2 -1 is not prime. ...
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Circle problem March 27th 2008, 10:08 AM mathlete Circle problem find a formula for the following function the top half of a circle with center (a,b) and radius r need some help with this one thanks... March 27th 2008, 10:23 AM iknowone Every point $(x,y)$ on the graph of a circle of radius $r$ ...
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Sample session with cdd+ Next: Is it possible to Up: Computing the Delaunay complex Previous: Computing the Delaunay complex &nbsp Contents Sample session with cdd+ Consider a simple two dimensional case: The first step is to write down the system of linear inequalities in 3.2: for each For our example, we h...
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Gradient of a function, cylindrical, spherical and Cartesian coordinates March 13th 2010, 02:08 PM #1 Gradient of a function, cylindrical, spherical and Cartesian coordinates Let $\vec A$ be a constant vector and let $f(\vec r)=\vec A \cdot \vec r$. Calculate the gradient of $f$ in Cartesian, cylindrical and sphe...
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Question in Advanced Algebra some things to help you narrow down the search: consider first the group of units of Z30 = {1,7,11,13,17,19,23,29}. a group can only have ONE idempotent, its identity. for if a*a = a, then: a-1*(a*a) = a-1*a (a-1*a)*a = e e*a = e a = e. so 1 is the only idempotent that is also a unit. this ...
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Turning Points June 14th 2009, 11:21 PM Joel Turning Points Having real trouble putting these together. Yor help would be appreciated Let f(x) = x³ + 3bx² + 3cx + d a) Show that y =f (x) has two distinct turning points if and only if b² > c b) If b² > c, show that the vertical distance betwe...
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solve the differential equation by separation of variables dy/dx = (cos x)e^(y+sinx) March 29th 2010, 03:54 PM -DQ- solve the differential equation by separation of variables dy/dx = (cos x)e^(y+sinx) dy/dx = (cos x)e^(y+sinx) i mean i put the y's and x's on the same side but couldn't proceed from it. guida...
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Computing the approximate population of a bloom filter up vote 12 down vote favorite 10 Given a bloom filter of size N-bits and K hash functions, of which M-bits (where M <= N) of the filter are set. Is it possible to approximate the number of elements inserted into the bloom filter? Simple Example I've been mullin...
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Can someone check a proof involving cases, please? January 9th 2012, 10:25 AM #1 Newbie Joined Aug 2011 Posts 18 I seem to think my proof of the following theorem has been made more complicated/lengthy than necessary. Any thoughts will be highly appreciated =) Prove that for all real numbers a and b,...
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multiple integrals February 4th 2009, 07:18 PM #1 Junior Member Joined Feb 2008 Posts 63 multiple integrals Find the volume enclosed by the following regions: x^2 + y^2 = 1; y^2 + z^2 = 1; z^2 + x^2 = 1: Google "Steinmetz solid" for information and proofs. You are given three circul...
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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. Math Forum » Discussions » sci.math.* » sci.math.independ...
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Gauss-Jordan Reduction April 3rd 2011, 05:40 PM brumby_3 Gauss-Jordan Reduction Solve the following set of homogeneous equations by Gauss-Jordan reduction of the matrix of coefficients (without the column of zeros from the right-hand side. 5x+5y-5z=0 3x+4y-7z=0 2y-8z=0 -2y-3y+6z=0 I know to...
4
[ -0.0439453125, 0.01495361328125, 0.0157470703125, 0.0162353515625, 0.046630859375, -0.041015625, 0.01007080078125, -0.059814453125, -0.0537109375, 0.04296875, 0.016845703125, -0.0185546875, 0.0277099609375, 0.00170135498046875, -0.076171875, 0.0023193359375, -0.0869140625, -0.01452...
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3cosx+4tanx+secx=0 February 24th 2011, 11:08 AM #1 3cosx+4tanx+secx=0 hello, i'm trying to work out this problem to solve for Theta... $3cos\Theta+4tan\Theta+sec\Theta=0$ I decided it would make sense to get all trig functions to be in terms of sec. So after manipulating the equation i came up...
4
[ -0.033935546875, 0.04296875, 0.0146484375, 0.059814453125, -0.06689453125, 0.045654296875, -0.029541015625, -0.0128173828125, 0.09326171875, -0.06787109375, 0.11376953125, -0.0693359375, -0.003021240234375, 0.07568359375, -0.0128173828125, -0.007232666015625, -0.035888671875, 0.061...
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Quadratic Equation Hidden, ax^2+bx+c=0 November 6th 2009, 01:50 AM learner123 Quadratic Equation Hidden, ax^2+bx+c=0 Hey all, I need help with this equation. It is a hidden equation which I have tried to solve on my maths booklet. The steps that must be followed are: ax^2 + bx + c = 0 I have ...
4
[ -0.07177734375, 0.028076171875, -0.031005859375, 0.064453125, -0.041748046875, 0.0810546875, -0.031982421875, 0.047607421875, -0.00098419189453125, 0.06298828125, 0.047607421875, -0.07861328125, -0.02734375, 0.08447265625, -0.00439453125, 0.0400390625, -0.09228515625, -0.0067138671...
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lim (1+1/x)^x as x->infinity July 19th 2010, 12:42 PM MechEng lim (1+1/x)^x as x->infinity Good afternoon, I am working on a problem that asks to find the following limit: $<br /> lim_{x\rightarrow\infty}(1+\frac{1}{x})^x<br />$ This should be equal to e, but I am having some difficulty rememberin...
5
[ 0.0216064453125, -0.041259765625, 0.01611328125, 0.00970458984375, 0.08154296875, -0.10498046875, 0.037841796875, 0.0284423828125, -0.0174560546875, 0.04296875, -0.00701904296875, -0.02685546875, 0.052001953125, 0.032470703125, 0.0198974609375, 0.0220947265625, 0.0040283203125, -0....
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Rotation, torques, precession Rotation, moment of inertia, torques, angular momentum, gyroscopes and precession: this page gives more detail to support the multimedia tutorial Rotation. This demonstration, also shown in the multimedia tutorial on rotation, illustrates rotational kinetic energy. The brass object init...
4
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Lagrange's Theorem Associated Topics || Dr. Math Home || Search Dr. Math Lagrange's Theorem Date: 01/24/2002 at 0...
5
[ -0.0634765625, 0.040771484375, 0.07958984375, 0.0225830078125, 0.044677734375, 0.01104736328125, 0.07421875, 0.02978515625, -0.039794921875, 0.02880859375, -0.0133056640625, 0.12890625, 0.0081787109375, -0.09912109375, -0.040771484375, 0.006134033203125, -0.08154296875, 0.009948730...
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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: Complex Matrix indexing Replies: 0 Complex Mat...
4
[ -0.0107421875, 0.0123291015625, -0.07421875, -0.0291748046875, 0.0098876953125, -0.0269775390625, 0.0137939453125, -0.07177734375, -0.0498046875, -0.00927734375, 0.0093994140625, 0.0264892578125, 0.058349609375, -0.01416015625, -0.037841796875, 0.07861328125, -0.06298828125, 0.0166...
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Cross and Dot Products January 29th 2009, 05:31 PM veronicak5678 Cross and Dot Products Find the cross product axb and verify it is orthogonal to both a and b a = <e^2t, 1, e^-t> b = <e^t, 2, e^-t> I calculated the cross product to be <-e^-t, e^t - 1, 2e^2t - e^t> and tried dotting it with a and b....
5
[ -0.08447265625, -0.003173828125, -0.0257568359375, -0.11083984375, -0.01190185546875, 0.0052490234375, 0.0028533935546875, 0.003387451171875, 0.0218505859375, 0.0289306640625, 0.060546875, -0.061279296875, 0.03564453125, -0.0169677734375, 0.03857421875, 0.0625, -0.036865234375, -0....
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Stigmatic Optical Systems : Optometry & Vision Science Astigmatism is a term bandied about in optometry frequently and in the vision sciences generally. In the case of a thin lens, I believe there is little disagreement over the meaning of the word; a thin lens is astigmatic if it has a nonzero cylinder. But what preci...
4
[ -0.000713348388671875, -0.050048828125, -0.0771484375, -0.0164794921875, -0.00994873046875, -0.0625, 0.134765625, 0.11279296875, 0.01025390625, 0.03955078125, 0.0224609375, -0.0458984375, -0.00005412101745605469, -0.0244140625, -0.06396484375, -0.0625, 0.00885009765625, 0.010070800...
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Lucas Number Proof By Induction July 26th 2008, 12:48 AM Kiwi_Dave Lucas Number Proof By Induction I am having some trouble proving the relationship $F_n$$L_n$= $F_{2n}$ where $F_n$, $L_n$ are the Fibronachi and Lucas numbers respectively. Oh, and how should I have written this in Laytex? Septemb...
5
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Policy: Policy: Copyright(c), 1990, 1995 Fred Cohen - All Rights Reserved If we consider a network as an information system, we can clearly use the same policy criteria for a network as a system. Networks introduce significant technical issues that are not considered to be as important in information systems because...
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Unit square integral Compute the following double integrals taken on an unit square: $\int_0^1\int_0^1\sqrt{x^2+y^2}\,dx\,dy$ $\int_0^1\int_0^1\frac{dx\,dy}{\sqrt{1+x^2+y^2}}$ $\int_0^1\int_0^1\frac{dx\,dy}{1-xy}$ $\ int_0^1\int_0^1\frac{dx\,dy}{(2-xy)\ln(xy)}$ $\int_0^1\int_0^1\frac{1-x}{\{-\ln(xy)\}^{5/2}}\,dx\,dy$ ...
5
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[SOLVED] Prove the identity, Stuck? August 7th 2009, 06:38 AM #1 Newbie Joined Aug 2009 From Cape Town Posts 2 Hi, I tried doing this equation over and over, but I can't seem to get it! I've had sleepless nights for the past week...lol. So, please help me and put me out of my misery, I beg you... ...
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Connected Hausdorff spaces and graphs March 11th 2010, 04:29 PM Drexel28 Connected Hausdorff spaces and graphs I came up with the following question, and would appreciate if I could get some validation/invalidation. If $X$ is connected Hausdorff and $\varphi:X\mapsto Y$ continuous then is $\Gamma_\varphi\su...
5
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Algorithm for finding the volume of a convex polytope up vote 14 down vote favorite 11 It's easy to find the area of a convex polygon by division into triangles, but what is the optimal way of finding the volume of higher-dimensional convex bodies? I tried a few methods for dividing them into simplices, but gave it up...
5
[ 0.00555419921875, 0.0045166015625, 0.029541015625, -0.05810546875, -0.087890625, -0.1611328125, 0.000957489013671875, -0.027099609375, -0.035888671875, 0.029541015625, -0.1181640625, -0.0380859375, -0.0169677734375, 0.037841796875, 0.000530242919921875, -0.0400390625, 0.103515625, ...
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Finding the Velocity Vector and Speed after t seconds September 27th 2009, 09:15 AM #1 Member Joined Sep 2009 Posts 79 Finding the Velocity Vector and Speed after t seconds This is to do with mechanics, which as far as I know is pre-calc, not pre-algebra. Question: A particle has an initial velocity...
5
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Closed-form solution of a recurrence relation. July 4th 2011, 01:43 AM #1 Junior Member Joined Jan 2010 Posts 52 Thanks 17 Closed-form solution of a recurrence relation. Suppose you have a recurrence relation like: ${x_{n + 2}} - 3{x_{n + 1}} + 2{x_n} = n{\rm$(1) With ${x_0} = {x_1} = 1$ ...
5
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power series: interval of convergence October 5th 2010, 12:03 AM #1 Member Joined Oct 2010 Posts 127 power series: interval of convergence A function (f) is defined by f(x) = 1 + 2x + x^2 + 2x^3 + x^4 + ... that is, its coefficients are c2n = 1 and c2n+1 = 2 for all n > or = to 0. Find the interval o...
4
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Cyclically 130 March 19th 2013, 01:58 AM geniusgarvil Cyclically 130 Consider all quadruples of real numbers (x1,x2,x3,x4), such that x1≤x2≤x3≤x4 and each of the four numbers plus the product of the other three equals 130. If S is the sum of all possible values of x4, what is S, rounded to the nearest i...
4
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Help with this D.E please April 2nd 2009, 06:49 PM #1 Newbie Joined Dec 2008 Posts 3 Help with this D.E please 1/v dv=-ke^(s/h) ds Where k is a constant Im trying to get v as a function of s by sep. of variables and am fairly confused by the algebra. Any help would be appreciated. What is ...
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collection of subsets November 28th 2008, 08:55 AM #1 Junior Member Joined Sep 2008 Posts 42 collection of subsets Let B be the collection of subsets of R of the form [a,b) for a<b, nulset, and the whole set R. Show that if A and C are elements of B then A intersect B is in B. and Show that ...
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When p is a prime prove that p | {p \choose k} June 15th 2011, 08:24 AM #1 Junior Member Joined Jun 2010 Posts 59 When p is a prime prove that p | {p \choose k} If p is a prime where $1 \le k < p$, then prove that $p | {p \choose k}$ This is a standard problem (I googled it and I find other hom...
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Solving differential equations with conditions November 12th 2012, 03:45 AM #1 Newbie Joined Nov 2012 From Canada Posts 17 Solving differential equations with conditions y’+ 2xy = 0; y= ce^(-x^2); y=0.5 when x = 0 I have to verify given function is a solution to differential equation. And Find C...
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proving convergence October 8th 2007, 07:46 AM #1 Newbie Joined Sep 2007 Posts 22 proving convergence Let A be a bounded subset of R with infinitely many elements. If s = supA is NOT an element of A, prove that there exists a strictly increasing sequence (xn), xn inA such that limi...
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Show that this ratio of factorials is always an integer up vote 28 down vote favorite 13 show the formula always gives an integer $$\frac{(2m)!(2n)!}{m!n!(m+n)!}$$ I don't remember where I read this problem, but it said this can be proved using a simple counting argument (like observing that $\frac{(3m)!}{m!m!m!}$ i...
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Factorial division problem February 21st 2010, 11:44 AM #1 Junior Member Joined May 2009 From Tokyo, Japan Posts 46 Factorial division problem As a last part of a solution of a second year algebra problem, I have to prove the identity: a!b! | (a+b)! a factorial times b factorial divides a+b...
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Treatise On Analysis Vol-Ii 9 MEASURABLE FUNCTIONS 147 12. (a) Let (//)o 5=^/1 be a sequence of real numbers, and let m be an integer fS/z. Let Lm be the set of indices / with the following property : there exists an integer p such that 0 fg;? <; w and tt + tl+1 -\ ----- h fi+P-i ^ 0. Show that Y tt *> 0. (Obs...
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analyzing a function January 5th 2008, 05:41 AM #1 Newbie Joined Dec 2007 Posts 9 hi! this is the given function: f(x) = |x+5|+ (|x^2+5x+6|/x) i divided it up into sections: f(x) = (x+5)+ (x^2+5x+6)/(x)) when -5<x<-3 x>-2 f(x)= -(x+5)+ (-(x^2+5x+6)/(x)) when x<-5 -3<x<-2 i wa...
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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: Abs and variables Replies: 3 Last Post: Jun 28, 19...
5
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Finding two linearly independent solutions (power series) April 24th 2013, 03:57 PM LinearOperator Finding two linearly independent solutions (power series) for (x^2+2)y'' +3x-y = 0 about the ordinary point x = 0 my guess was y = sum c_nx^n I think that I did my sum correctly but if someone can double ...
4
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Optimization Problem February 3rd 2009, 03:04 PM #1 Newbie Joined Dec 2008 Posts 19 Optimization Problem Hi, I had a problem that I just had no idea how to do. I was told it was an optimization but I am still confused. The problem states : Let S denote the set of points with the coordinates (x,y) suc...
5
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kinematics question October 13th 2006, 03:20 PM scorpion007 kinematics question A balloon is rising vertically at a constant speed of 21 m/s. A stone is dropped from the balloon when it is h metres above the ground. The stone strikes the ground 10 seconds later. Assuming that air resistance is negligeble, wh...
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[SOLVED] quadratic residues congruence problem November 19th 2009, 02:23 PM #1 Senior Member Joined Feb 2008 Posts 410 [SOLVED] quadratic residues congruence problem list all solutions of...the ten congruences $x^2\equiv a\mod 11^2$ where $a=1,3,4,5,9$. We know that each congruence has two solutions...
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Generating Function of Catalan Numbers Date: 04/04/2000 at 04:57:41 From: Chris Subject: Combinatorics - generating functions I don't know if you can be any help, but I was given a problem to solve, which the professor has said is a little beyond where we are but he wanted to know if anyone could answer it. I have w...
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[ -0.0625, 0.0045166015625, 0.0888671875, 0.046142578125, -0.06591796875, 0.0223388671875, 0.0035400390625, -0.0159912109375, -0.0228271484375, -0.05126953125, -0.0179443359375, -0.061279296875, -0.0001697540283203125, -0.09375, -0.072265625, 0.0595703125, 0.01434326171875, -0.094726...
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Filling Cylindrical Holes Date: 05/18/99 at 13:30:44 From: Daymon Raue Subject: volume of cylinder Dear Dr. Math, I'm filling holes with cement. There are 42 holes they have a 9" diameter and are 4' deep. We want to figure out how much cement it will take in yards. If you please figure this out and tell me the answ...
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[ 0.0205078125, 0.018310546875, 0.018310546875, 0.0111083984375, -0.0703125, -0.05078125, -0.05224609375, 0.09375, 0.00811767578125, -0.0224609375, -0.0927734375, -0.027099609375, 0.0712890625, 0.07177734375, 0.0023956298828125, 0.07275390625, -0.037353515625, 0.042236328125, -0.11...
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