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Help with proof set A= set B October 10th 2012, 12:22 PM Ben91 Help with proof set A= set B So here's the question(Crying) : Let A = {n ∈ N : the last digit of 2^n is 8}, B = {n ∈ N : n+1 is divisible by 4}. Show that A = B. Now i understand what this question is saying and i understand ...
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Number theory Question 2 January 14th 2009, 02:38 AM #1 Member Joined Aug 2008 Posts 97 Number theory Question 2 Show that if p is not a Fermat prime, then there is a such that $<br /> <br /> \left(\frac {a}{p}\right)=-1<br />$ and [a]_p is not a generator of $(\mathbb Z/p)^*$. Here $<br />...
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euler phi-function March 29th 2009, 11:00 AM #1 Junior Member Joined Feb 2009 Posts 29 euler phi-function Hi, I need help with this proof: Prove that there are no integers n for which phi(n) = n/4 Appreciate any assistance I did that but I'm still stuck. Any ideas on how I should proc...
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definite integral #3 Starting with integration by parts (twice), we have: \displaystyle \begin{aligned} \int_{0}^{1}\left(\tan^{-1}(x)\right)^2\;{dx} &= x(\tan^{-1}{x})^2\bigg|_{ 0}^{1}-\int_{0}^{1} \frac{2x\tan^{-1}{x}} {1+x^2}\;{dx} \\& = \frac{\pi^2}{16}- \int_{0}^{1} \left[\ln(x^2+1)\right]'\tan^{-1}{x}\;{dx} \\&= ...
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bijection of e^x * ln x January 20th 2010, 11:50 AM #1 Newbie Joined Jan 2010 Posts 21 bijection of e^x * ln x Hey people. I need to prove that f(x)=e^x * ln x gets every value in R exactly once. I managed to prove that f(x) gets every value in R , i.e. , for each y in R there is x in (0,inf) such as...
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More questions:) January 11th 2008, 07:58 PM chaneliman More questions:) 1. How would u go about finding the inverse of the following funcions: (i can do the regular ones) a. f:R\{1} ~ R, f(x)= x+1/x-1 b. f:R\{2/3}~R, f(x)= 2x+3/3x-2 2. Let f:S~R be given by f(x)=x-3/2x-1 where S=R\{1/2} a....
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Integral of (x-7)(3-2x)^(3/2) October 25th 2009, 01:08 PM emonimous Integral of (x-7)(3-2x)^(3/2) Hey guys, I have this problem I have been trying to solve for the longest time. Not looking for a complete solution, maybe part of one would be nice. I'm trying to integrate $\int(x-7)\sqrt{3-2x}^3$ So...
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All-Optical Fiber Interferometer-Based Methods for Ultra-Wideband Signal Generation Journal of Electrical and Computer Engineering Volume 2012 (2012), Article ID 314872, 6 pages http://dx.doi.org/10.1155/2012/314872 Research Article All-Optical Fiber Interferometer-Based Methods for Ultra-Wideband Signal Generation ...
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Homework Help Posted by Esther on Friday, February 4, 2011 at 12:34am. The Everton college store paid 1519 for an order of 41 calculators. The store paid 9 for each scientific calculator. The other, all graphic calculators cost the store 55 each. How many of each type of calculators was ordered?. Thank you • Algebr...
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normal Sylow subgroups November 10th 2008, 12:20 PM #1 Member Joined Sep 2008 Posts 166 normal Sylow subgroups Let G be a finite group with $|G|=pqr$, where $p, q, r$ are primes with $p<q<r$. Prove that G has a normal Sylow subgroup for either p, q, or r. suppose to the contrary that neither of Sylo...
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Recursive formula for Negative Binomial(?) random variable July 21st 2009, 02:49 PM #1 Junior Member Joined Jul 2009 Posts 25 Recursive formula for Negative Binomial(?) random variable I am struggling with this homework problem any help would be greatly appreciated. Let X denote the random variable...
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Differential Equation May 14th 2008, 06:21 AM #1 Junior Member Joined May 2008 Posts 50 Differential Equation Hi everybody, Can anybody please help me solve the following differential equation: d^2y/dx^2 + 3(dy/dx) +5y = 0, y(0) = 2, dy/dx(0) = 0 Even a a simple guide to solving this woul...
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Calculus AP need help! Posted by cynthia on Tuesday, February 28, 2012 at 1:57am. 1. f(x)=√5x+6, find f'(x) 2. f(x)=√4x^2+3x+4, find f'(x). i got stuck. f(x)=√5x+6=(5x+6)^1/2 f'(x)= 1/2(5x+6)^-3/2*(5). • Calculus AP need help! - Steve, Tuesday, February 28, 2012 at 11:09am Almost. How did you get from ^1/2...
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the encyclopedic entry of Perfect totient number In number theory , a perfect totient number is an integer that is equal to the sum of its iterated totients . That is, we apply the totient function to a number n , apply it again to the resulting totient, and so on, until the number 1 is reached, and add tog...
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Simple Exact Algorithm for Transistor Sizing of Low-Power High-Speed Arithmetic Circuits VLSI Design Volume 2010 (2010), Article ID 264390, 17 pages http://dx.doi.org/10.1155/2010/264390 Research Article Simple Exact Algorithm for Transistor Sizing of Low-Power High-Speed Arithmetic Circuits ^1Faculty of Electrical ...
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Third degree ploynomial question : 2 February 28th 2009, 11:03 AM champrock Third degree ploynomial question : 2 if a,b,c are the roots of the equation: x^3 + 2x^2 + 3x + 3 = 0 then the value of [a/(a+1)]^3 + [b/(b+1)]^3 + [c/(c+1)]^3 is? ---------- I know that this equation has one real root and t...
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[SOLVED] stuck on area/integrals can someone help me i know i m doing something wrong.. where did i start to go wrong? Enclosed area $= \int\limits_0^1 {\sqrt x } ~dx + \int\limits_1^3 {\sqrt {\frac{{3 - x}}{2}} } ~dx \hfill \\$ Now, $\int\limits_0^1 {\sqrt x } ~dx = \left[ {\frac{2}<br /> {3}x^{\frac{3}<br /> {2}} } ...
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the encyclopedic entry of subset's In differential geometry , Hilbert's theorem (1901) states that there exists no complete regular surface $S$ of constant negative Gaussian curvature $K$ immersed in $mathbb\left\{R\right\}^\left\{3\right\}$ . This theorem answers the question for the negative case of which s...
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Complex fractions July 17th 2008, 06:41 AM #1 Newbie Joined May 2008 From New York Posts 19 Complex fractions Can someone please help me with these math problems and explain them? I don't know what to do. 2x-18 divided by x squared - 16 w squared + 5w divided by w squared - 25...
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Concrete Mix Design Concrete is made from different proportions of cement, fine aggregate (sand), coarse aggregate, and water. Cement usually comes in 94 lb sacks, water is measured by gallons (volume), and coarse and fine aggregate by weight. These are all over the place. There are two main methods of measuring con...
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-Derivations of BCI-Algebras Abstract and Applied Analysis Volume 2012 (2012), Article ID 872784, 12 pages http://dx.doi.org/10.1155/2012/872784 Research Article On -Derivations of BCI-Algebras Department of Mathematics, University of Tabuk, P.O. Box 741, Tabuk 71491, Saudi Arabia Received 29 January 2012; Revised ...
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A Note on Some Best Proximity Point Theorems Proved under Abstract and Applied Analysis Volume 2013 (2013), Article ID 189567, 3 pages http://dx.doi.org/10.1155/2013/189567 Research Article A Note on Some Best Proximity Point Theorems Proved under P-Property ^1Department of Mathematics, Imam Khomeini International ...
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Local Characterizations of Besov and Triebel-Lizorkin Spaces with Variable Exponent Journal of Function Spaces Volume 2014 (2014), Article ID 417341, 8 pages http://dx.doi.org/10.1155/2014/417341 Research Article Local Characterizations of Besov and Triebel-Lizorkin Spaces with Variable Exponent Department of Mathem...
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primitive root March 8th 2010, 07:58 AM #1 Banned Joined Mar 2010 From India Posts 10 primitive root For which prime p does the congruence (x^2 + 4x + 5) mod p =0 have a solution? some hint about this. 1) if p = 2 then $x^2+4x+5=x^2+1=(x+1)^2\!\!\!\pmod 2$ and we have a double root; ...
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Greatest common divisor proofs March 14th 2009, 11:30 PM #1 Newbie Joined Mar 2009 Posts 8 Here are some GCD questions I am struggling with: 1. Prove that, for a,n positive integers: (a) n is divisible by gcd(a,a+n). (hint use the division identity M=aq+r) (b) Hence show that GCD(a,a+1)=1 ...
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trig help November 27th 2008, 02:07 PM #1 Newbie Joined Nov 2008 Posts 6 trig help This is what the problem says: solve the equation for solutions in the interval [0,2pi] showing all steps would be appreciated. 2sin²(x) - cos(x) - 1 = 0 Last edited by ThePerfectHacker; November 30th 2...
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Weighted-Average Cost of Capital (WACC) The rate used to discount future unlevered free cash flows (UFCFs) and the terminal value (TV) to their present values should reflect the blended after-tax returns expected by the various providers of capital. The discount rate is a weighted-average of the returns expected by the...
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Argument Property for Certain Analytic Functions Abstract and Applied Analysis Volume 2012 (2012), Article ID 391038, 8 pages http://dx.doi.org/10.1155/2012/391038 Research Article Argument Property for Certain Analytic Functions Department of Mathematics, Yangzhou University, Yangzhou 225002, China Received 18 Sep...
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give an equation for the plane that is parallel to the plane.... December 5th 2010, 04:08 PM #1 Junior Member Joined Oct 2009 Posts 72 give an equation for the plane that is parallel to the plane.... give an equation for the plane that is parallel to the plane 5x-4y+z=1 and that passes through the point ...
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Right Angle Relationships February 12th 2011, 04:58 PM #1 Right Angle Relationships Hello, I am stuck on how to solve this problem: Write each expression as an algebraic (nontrigonometric) function expression in u, $u>0$ $\sin(2\sec^{-1} \frac{u}{12})$ Hello, ~berserk! Write the expression as a...
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Substitution for diff. eq. May 17th 2010, 11:46 AM #1 Newbie Joined Apr 2010 Posts 11 Substitution for diff. eq. Hi Having a bit of trouble with what the substition would be to solve this diff. Any ideas? Thanks. dy/dx = (xy)/(x^2 - y^2) divide the right hand side by x^2 $\frac{dy}{dx...
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the encyclopedic entry of Triangle_inequality In mathematics , the triangle inequality states that for any triangle , the length of a given side must be less than or equal to the sum of the other two sides but greater than or equal to the difference between the two sides. In Euclidean geometry and some other geo...
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Existence and Uniqueness of Solutions for Initial Value Problem of Nonlinear Fractional Differential Equations Abstract and Applied Analysis Volume 2012 (2012), Article ID 615230, 14 pages http://dx.doi.org/10.1155/2012/615230 Research Article Existence and Uniqueness of Solutions for Initial Value Problem of Nonline...
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Is an answer possible with the given information? September 15th 2009, 10:59 AM #1 Newbie Joined Sep 2009 Posts 1 Is an answer possible with the given information? P(A U B) = .7 P(A U compliment of B) = .9 Find P(A) I've racked my brain and cannot come up with an answer. This is all I've ...
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iffusion Δt/h^2 framerate:fps Diffusion on 512×512 square. Implicit scheme and relaxation algorithm. Diffusion equation For the diffusion equation ∂[t ]u = Δu , u|[t=0] = exp(-(r - r[o ])^2/ a^2), the finite-difference scheme on square grid with the space step h and time step dt is u[x,y]^t+1 = u[x,y]^t + {[u[x+1,y]...
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Physics Forums - View Single Post - Perturbation Theory - Shift of Ground State Perturbation Theory - Shift of Ground State I can guarantee that there's a section on time-independent perturbation theory in your textbook. You want to rewrite your Hamiltonian in the form [tex]\hat{H} = \hat{H}_0 + \lambda \hat{H}^{(1)...
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Include uncertainty in a financial model April 1, 2014 By simonraper Here’s a post that appears on my new website, ragscripts.com. On-line resources for analysts are often either too general to be of practical use or too specialised to be accessible. The aim of ragscripts.com is to remedy this by providing start to ...
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Empirical Bayes October 20th 2010, 10:35 AM #1 Member Joined Mar 2010 Posts 98 Empirical Bayes So, I'm taking an inference course. Working through some (optional) homework, the theme of the current problems seems to be (1) find a Bayes estimator of theta and then (2) show that "blah" is an empirical ...
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[ 0.01953125, -0.031982421875, 0.119140625, -0.0201416015625, 0.04150390625, 0.00543212890625, 0.008544921875, -0.0439453125, -0.0155029296875, 0.003173828125, 0.08642578125, -0.05712890625, 0.1279296875, -0.058349609375, -0.05859375, 0.0869140625, 0.09130859375, 0.0079345703125, 0...
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Appendix A This appendix contains outline proofs and derivations for the theorems and formulas given in early part of Chapter: The Scaling Function and Scaling Coefficients, Wavelet and Wavelet Coefficients . They are not intended to be complete or formal, but they should be sufficient to understand the ideas behind wh...
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fourier series/ trig calculus problem help September 21st 2013, 10:54 PM action44 fourier series/ trig calculus problem help 1) In deriving the coefficient of Fourier series (i.e., the related Euler equations), we take advantage of the orthogonality of the trigonometric system which indicated, among other thing...
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Find the equation of the exponential function, am I doing it wrong? December 4th 2012, 02:55 PM #1 Junior Member Joined Oct 2012 From Oregon Posts 33 Find the equation of the exponential function, am I doing it wrong? If I'm doing it wrong, where am I doing it wrong? Here is my work f(3) = ...
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[SOLVED] Convertence November 3rd 2007, 07:01 PM #1 Member Joined Nov 2006 From Florida Posts 228 [SOLVED] Convertence Let $a_n$ be a sequence of real numbers such that $|a_{n+1}-a_n|<\frac{1}{2^n}$ for $n=1,2,\dots$ prove that the sequence converges. My first thought was to show that $a_n$ was ...
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Write a recurrence relation August 31st 2009, 07:32 AM #1 Junior Member Joined Aug 2009 Posts 28 There are 2n points marked on a circle. We want to divide them into pairs and connect the points in each pair by a segment (chord) such that these segments do not intersect. Let $Q_{n}$ be the number of w...
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Ch A Page 255: Sustainable Energy - without the hot air | David MacKay • The tube of air created in a time t has a volume Avt, where A is the cross-sectional area of the tube, which is similar to the area of the front view of the car. (For a streamlined car, A is usually a little smaller than the frontal ...
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A Novel Weighted Support Vector Machine Based on Particle Swarm Optimization for Gene Selection and Tumor Classification Computational and Mathematical Methods in Medicine Volume 2012 (2012), Article ID 320698, 7 pages http://dx.doi.org/10.1155/2012/320698 Research Article A Novel Weighted Support Vector Machine Base...
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IntroductionSAR Signal ModelingTwo Dimensional Overlapped Subaperture Polar format Algorithm (PFOSA) [9]Stepped-Chirp based PFOSA (SCPFOSA)Simulation ResultsConclusionReferencesFigures Sensors Sensors 1424-8220 Molecular Diversity Preservation International (MDPI) 10.3390/s8053438 sensors-08-03438 Article A Two Dimensi...
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D.e mixing problem April 27th 2010, 08:51 AM #1 Newbie Joined Apr 2010 Posts 1 D.e mixing problem 300 gallon tank contains 100 gallons of brine with a concentration of 1 pound of salt per gallon.a brine containing one half point of salt per gallon runs into the tank at rate of four gallons per minute...
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Negative Index & Binomial Theorem August 4th 2008, 03:39 PM #1 Newbie Joined Jul 2008 Posts 2 Negative Index & Binomial Theorem hey everyone, I'm teaching myself calculus, because I felt it would be useful, even if I'm not going to use it in accounting. I am learning about the binomial theorem and differ...
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the encyclopedic entry of division-algorithm The division algorithm is a theorem in mathematics which precisely expresses the outcome of the usual process of division of integers . The name is something of a misnomer , as it is a theorem , not an algorithm , i.e. a well-defined procedure for achieving a...
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nth derivative formula April 27th 2009, 03:29 PM #1 Member Joined Feb 2009 Posts 106 nth derivative formula find an explicit formula for the $nth$ derivative of $1/x$ so, i know $f^{0}(x)=1/x$ $f^{1}(x)=-1/x^2$ $f^{2}(x)= 2/x^3$ $f^{3}(x)=-6/x^4$ i'm not sure i see the pattern.. ...
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problem of Integral proof You have to take into account that for $|x|<1$ is... $\frac{x^{4}\cdot (1-x)^{4}}{1-x^{2}}= (1-x)^{4}\cdot (x^{4} + x^{6} + x^{8} + \dots)$ Kind regards $\chi$$\sigma$ It seems that you're not expected to use a) to evaluate the integral. The simplest way anyway is probably to expand the numer...
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Radian Question. January 13th 2011, 02:02 PM #1 Newbie Joined Sep 2010 Posts 8 Radian Question. Just got done reading the chapter... Want to make sure I have this right.... IF Circumference = 2(pi)r Let cir = 360 deg. So that 360 deg = 2(pi)r And 180 deg = (pi)r IF r = 10 then ...
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Simple linear regression August 5, 2009 By Todos Logos We use the regression analysis when, from the data sample, we want to derive a statistical model that predicts the values of a variable (Y, dependent ) from the values of another variable (X, independent ). The linear regression , which is the simplest a...
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Profit & Loss August 17th 2008, 10:20 PM #1 Junior Member Joined Aug 2008 From India Posts 44 Profit & Loss A man sells 5 eggs for 10 rupees and gains 20% profit.How much eggs did he buy for Rs.10? Yes,this is the quetion as a whole.Thank You. Last edited by devi; August 17th 2008 at 11:52 P...
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Lebesgue Integral August 21st 2009, 06:34 AM #1 Member Joined Aug 2009 Posts 78 Lebesgue Integral If f is measurable function such that $\int_B f =0$ for all measurable sets $B \subset A$ ,show that f =0 almost everywhere on $A$. For n=1,2,3,..., let $B_n = \{x\in A:f(x)\geqslant1/n\}$. Then $B_n$ i...
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Girard's Theorem Girard's Theorem: On a Sphere, &nbsp Area(Triangle) = Radius^2 x AngleExcess Make Translucent NOTE: Drag mouse to rotate model. Hold shift key or use mouse wheel to zoom it. Proof Consider the white triangle \(\sf T \) on the sphere shown above. Girard's Theorem gives a formula for the area of \...
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First order ODEs Greetings, I have a few differential equation questions and I began to take this course at the beginning of this semester so I might have been doing obvious mistakes.These questions are from Ross, Differential Equations 1st edition chapter 2.2. 3. $2r(s^2+1)dr+(r^4+1)ds=0$ 14. $(\sqrt(x...
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Find the necessary conditions for these two second degree equations to both be true • /r/CasualMath Find the necessary conditions for these two second degree equations to both be true (self.CasualMath) submitted by A_Monocle_For_Sauron sorry, this has been archived and can no longer be voted on The two equations are...
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Find the exact value of s in the given interval that has the given function value February 25th 2013, 09:02 PM #1 Junior Member Joined Feb 2013 From San Diego Posts 37 Thanks 3 Find the exact value of s in the given interval that has the given function value a) [pi, 3pi/2 ] ; sin(s) = -(sqrt of 2...
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Effect of large cardinals on the value of $\omega_1^L$ in $L$ up vote 7 down vote favorite I have three three questions, the first two of which probably have the same answer and the third of which is more vague. For a set $A$ let $L_\alpha(A)$ be the constructible universe up to $\alpha$, built from $A$ as a set (and...
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matrix orthogonal May 9th 2008, 01:53 AM #1 Junior Member Joined Apr 2008 Posts 72 matrix orthogonal This is probably easier than I think it looks but..im stumped... Here goes A is an n x n orthoganal matrix...show that a^t(transpose of a) is also orthoganal Thanks in advance It follow...
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The Hundred Penny Box Description: After reading The Hundred Penny Box, students compare how people save money in financial institutions. Students analyze the advantages of regular saving and how savings grow with compounding. Personal Finance Concepts: Saving, savings, interest, interest rate, compounding Related Su...
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Motorcycle and Walking Rates and Times June 16th 2011, 11:16 AM #16 MHF Contributor Re: Motorcycle and Walking Rates and Times Last edited by Ackbeet; June 16th 2011 at 06:27 PM. Reason: Split out Wilmer's comments. Re: Motorcycle and Walking Rates and Times see the example in #9. there you must carry B ba...
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modular arithmetic October 8th 2011, 05:30 AM Duke modular arithmetic What are the solutions to x^2+1=0 in Z_3, Z_2 and C. Is the answer as simple as: no solutions in Z_3 and Z_2 and x=i,-i in C? October 8th 2011, 05:45 AM Deveno Re: modular arithmetic short answer: no. slightly longer answer: x^2+1...
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logs again simplify log(base4/9)(27/16) without a calculator i've tried everything i could think of without a calculator, so here i am. $\frac{27}{16} = \frac{3}{4}\cdot\frac{9}{4}$ $= \frac{3}{4}\left(\frac{4}{9}\right)^{-1}$. So $\log_{\frac{4}{9}}\frac{27}{16} = \log_{\frac{4}{9}}\left[\frac{3}{4}\left(\frac{4}{9}\...
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Hard question February 9th 2010, 10:33 PM #1 Senior Member Joined Jul 2009 From Singapore Posts 338 Hard question A region of the xy plane is defined by the inequalities $0\leq y\leq \sin x$, $0\leq x\leq \pi$ Find: (a) the area of the region (b) The first moment of area about the x-...
5
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area bounded by curves October 21st 2009, 03:45 AM zerocool18 area bounded by curves hello , ive been stuck on this problem all night now. my heads starting to hurt lol. anyway im supposed to determine the area of the region by the graphs of the equations y=sin^2(pix) , y=0 , x=0 , x=1. heres a link to ...
5
[ -0.0155029296875, -0.0133056640625, 0.040283203125, 0.04931640625, -0.04931640625, -0.038818359375, -0.06787109375, 0.037841796875, -0.01043701171875, 0.00823974609375, 0.047119140625, 0.01397705078125, 0.0419921875, 0.0869140625, 0.003692626953125, -0.0035552978515625, 0.00120544433...
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TRIG QUESTION :) ( yes another ) October 25th 2007, 07:47 PM #1 Newbie Joined Oct 2007 Posts 20 TRIG QUESTION :) ( yes another ) Determine θ in decimal degrees, 0° ≤ θ ≤ 90°. Round results to an appropriate number of significant digits. sec θ = 1.5 answer = 48 degrees how do i get to this ...
4
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heat equation problem October 11th 2011, 03:29 AM #1 Newbie Joined Jan 2011 Posts 24 heat equation problem Hi! I've got the following problem: $f:\mathbb{R}\rightarrow\mathbb{R}$ a $C^2$-function such that $f$ is convex and $f(0)=f'(0)=0$. $g\in C^{\infty}([0,\infty),\mathscr{S}(\mathbb{R}^d))$...
5
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critical number? determine the value of a for which the function f has no critical number: f(x)= (a2+a-6)cos2x+(a-2)x+cos1 What do you find when you equate the derivative to zero? Is the last term actually cos(1)? yes the last term is actually cos(1) and how do you take the derivative and set it equal to zero? is a j...
4
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Trigonometric Function November 6th 2007, 10:24 PM #1 Newbie Joined Oct 2007 Posts 8 Trigonometric Function Ok I'm asked to find the other Trig. Functions given one value. Here's the question: sec = -2 tan > 0 So sec = 1/x, so I get 1/(-1/2) = -2. If I'm understanding it correctly, x = ...
4
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Simple expression manipulation. March 8th 2009, 04:58 AM #1 Senior Member Joined Jul 2006 Posts 364 Simple expression manipulation. I'm only concerned about the expressions highlighted in red. How did they get from the first to the second? I would have expected something like, $2 (\vec{u} \cdot \v...
4
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A Unique Common Triple Fixed Point Theorem for Hybrid Pair of Maps Abstract and Applied Analysis Volume 2012 (2012), Article ID 750403, 9 pages http://dx.doi.org/10.1155/2012/750403 Research Article A Unique Common Triple Fixed Point Theorem for Hybrid Pair of Maps ^1Department of Mathematics, Acharya Nagarjuna Uni...
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Three-Dimensional Filamentation Analysis of SDSS DR5 Survey ISRN Astronomy and Astrophysics Volume 2012 (2012), Article ID 171829, 7 pages http://dx.doi.org/10.5402/2012/171829 Research Article Three-Dimensional Filamentation Analysis of SDSS DR5 Survey ^1Department of Astronomy, University of Science and Technology...
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Integrals - ln, sqrts April 20th 2010, 04:32 AM #1 Member Joined Jul 2009 Posts 168 Integrals - ln, sqrts My English-Math language isn't too good, so I'll try to use math to explain: $\int \sqrt{x} \ln{(1+\sqrt{x})} dx$ $t:=ln(1+\sqrt{x}) \Rightarrow dt=\frac{1}{2\sqrt{x}(1+\sqrt{x})} <br /> \R...
5
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Mixed-Effects Tobit Joint Models for Longitudinal Data with Skewness, Detection Limits, and Measurement Errors Journal of Probability and Statistics Volume 2012 (2012), Article ID 614102, 19 pages http://dx.doi.org/10.1155/2012/614102 Research Article Mixed-Effects Tobit Joint Models for Longitudinal Data with Skewne...
4
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Another Quadratic Equation June 15th 2009, 07:08 AM #1 Junior Member Joined May 2009 Posts 68 Another Quadratic Equation I buy a number of cheap calculators for a total of $240, mark each of them up by $2 and sell all but four of them for a total of $240. How many calculators did I buy? Okay, so thi...
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open/closed/interior May 6th 2009, 10:20 PM #1 Junior Member Joined Feb 2009 Posts 28 open/closed/interior For the question above, I can only answer part a) The set is not open or closed since it doesn't contain the neighborhood at 1 and int(S) = {(x,y) in R2 : x^2 + y^2 < 1} \ {(0,0)}. Is it ri...
5
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Solving Exponential Functions February 20th 2008, 12:11 PM #1 Newbie Joined Feb 2008 Posts 16 Solving Exponential Functions I know several methods in finding the value o x, but i can't figure this one out: 5^(x+2) - 5^(x) = 24 So that says 5 to the power of x plus 2 minus 5 to the power of x eq...
4
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Parametric Curve and Travelling Object, help July 3rd 2007, 10:58 PM #1 Newbie Joined Jun 2007 Posts 3 Parametric Curve and Travelling Object, help Hi everyone, I received this problem in my Calculus 2 class today as a bonus problem and I don't know how to proceed on it: --- A bead is sliding o...
5
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Geometric Programming Approach to an Interactive Fuzzy Inventory Problem Advances in Operations Research Volume 2011 (2011), Article ID 521351, 17 pages http://dx.doi.org/10.1155/2011/521351 Research Article Geometric Programming Approach to an Interactive Fuzzy Inventory Problem Department of Mathematics, Silda Cha...
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The Chess960 Numbers Decoded Convert to and from Chess960 numbers mathematically, without lookup tables 0 NNxxx Qxxxxx Bxxx Bxxx 1 NNxxx Qxxxxx Bxxx xBxx 2 NNxxx Qxxxxx Bxxx xxBx 3 NNxxx Qxxxxx Bxxx xxxB 4 NNxxx Qxxxxx xBxx Bxxx 5 NNxxx Qxxxxx xBxx xBxx 6 NNxxx Qxxxxx xBxx xxBx 7 NNxxx Qxxxxx xBxx xxxB...
5
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[SOLVED] Natural Log Limit November 30th 2009, 06:24 AM #1 Member Joined Jul 2008 Posts 119 [SOLVED] Natural Log Limit Evaluate $\lim_{t\to-5} \ln(t+5)^2$ Since $\ln(0)^2$ is undefined, I used L'Hopital's Rule twice to get $\lim_{t\to-5} \ln(t+5)^2 = \lim_{t\to-5}\frac{2 \ln(t+5)}{t+5} = \f...
5
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integral tables December 12th 2009, 05:54 PM #1 Newbie Joined Dec 2009 Posts 3 integral tables I need to integrate this integral from -infinity to infinity, ∫▒〖(x^3 e^x)/(e^x+1)^2 dx〗 The question says I can look it up in integral table but I cannot find tables with this type of integral in it....
5
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Using a Reduction Formula December 6th 2009, 01:51 PM #1 Super Member Joined Jun 2009 From United States Posts 676 Thanks 19 Using a Reduction Formula I want to prove equation (1). Note that the equation (2) can be proven by the reduction formula for $\int sin^n(x)dx$, but I'll just write the for...
5
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Scheme implementation overview PointSets and points over a ring: For algebraic schemes \(X/S\) and \(T/S\) over \(S\), one can form the point set \(X(T)\) of morphisms from \(T\to X\) over \(S\). sage: PP.<X,Y,Z> = ProjectiveSpace(2, QQ) sage: PP Projective Space of dimension 2 over Rational Field The first line is a...
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Approximate Analytical Solutions for Mathematical Model of Tumour Invasion and Metastasis Using Modified Adomian Decomposition and Homotopy Perturbation Methods Journal of Applied Mathematics Volume 2014 (2014), Article ID 654978, 13 pages http://dx.doi.org/10.1155/2014/654978 Research Article Approximate Analytical ...
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Self intersection Show that the following curve is not closed and that it has exactly one self- intersection γ(t)=(t²-1.t³-t) Let $a,b$ be the times where the curve intersects with $a e b$then $x=a^2-1$ and $y=a^3-a$ and $x=b^2-1$ and $y=b^3-b$ Subtracting the x equations gives $0=a^2-b^2 \implies a=\pm b$ Since $ae b...
5
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Question 5 November 6th 2006, 07:47 PM CaptainBlack Question 5 ImPerfectHacker has requested that I set a problem this week so here it is: Problem of the Week 5 Given any four distinct points $A,\ B,\ C,\ O$, show that the three angles between the bisectors of $\angle AOB$, $\angle BOC$ and $\angle COA...
5
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Final Review Before Last Test May 15th 2010, 07:29 AM eradicator2010 Final Review Before Last Test We are having our last test in Trig on Monday and he gave us a last minute review to do over the weekend. The problem is I missed lots of school (I had mono) and am behind. I got all the notes but it makes no s...
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algebra equation December 9th 2008, 09:05 PM #1 Newbie Joined Dec 2008 Posts 1 algebra equation Hello all, I'm currently in an online math course do not understand any of these review questions. We were pretty much just told to do these without any guidance, example, or review. I was wondering if som...
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Help me to solve this equation with Solve command GROUPS: Hello, I'm trying to solve an equation as in attached image. However, Mathematica version 9 couldn't solve the equation and return with error message: "Solve::nsmet: This system cannot be solved with the methods available to Solve" dang The...
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Arresting Strategy Based on Dynamic Criminal Networks Changing over Time Discrete Dynamics in Nature and Society Volume 2013 (2013), Article ID 296729, 9 pages http://dx.doi.org/10.1155/2013/296729 Research Article Arresting Strategy Based on Dynamic Criminal Networks Changing over Time ^1Department of Mathematics, ...
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Fractional Differential Equations with Fractional Impulsive and Nonseparated Boundary Conditions Abstract and Applied Analysis Volume 2014 (2014), Article ID 364348, 11 pages http://dx.doi.org/10.1155/2014/364348 Research Article Fractional Differential Equations with Fractional Impulsive and Nonseparated Boundary Co...
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Beat Phenomenon Analysis of Concrete Beam with Piezoelectric Sensors International Journal of Distributed Sensor Networks Volume 2012 (2012), Article ID 296124, 10 pages http://dx.doi.org/10.1155/2012/296124 Research Article Beat Phenomenon Analysis of Concrete Beam with Piezoelectric Sensors Faculty of Infrastructu...
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Why is Fibonacci =< golden ration^n-1 September 9th 2009, 12:31 PM #1 Newbie Joined Sep 2009 Posts 23 Why is Fibonacci =< golden ration^n-1 How can it be proved by induction that the Fibonaaci series is always: Fn <= ( (1 +sqrt 5)/2 )^(n−1). F0 = 0, F1 = 1, Fn+2 = Fn+1 + Fn, for n = 0, 1, 2...
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Finding this limit using Algebra August 30th 2009, 07:05 PM usmelikchees Finding this limit using Algebra Lim .... .... x-2 x->-2 ....x^2-4 I got 4 using algebra, but I did the thing where you put -1.999 instead of -2 into the function and got 1/2, and I tried an online limit calculator and got infinity...
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circle geometry questions---please help!! July 1st 2007, 09:18 PM #1 shosho Guest circle geometry questions---please help!! i need some help with a question on circle geometry any help would be great POints A,B,C,D,E,F lie on teh circumference of a circle Prove that <ABC+<CDE+<EFA=360 thanx ...
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Finding areas of sectors using radians February 15th 2013, 03:20 AM pturo1 Finding areas of sectors using radians There is a question on the area of a sector of a circle on which I am stuck and was wondering whether anyone could give me a pointer. I have attached an image of the diagram to which the questi...
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Homotopy Perturbation Method for Solving Reaction-Diffusion Equations Mathematical Problems in Engineering Volume 2008 (2008), Article ID 795838, 5 pages http://dx.doi.org/10.1155/2008/795838 Research Article Homotopy Perturbation Method for Solving Reaction-Diffusion Equations School of Information Engineering, Zhe...
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