# Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
 Views: 8,737 Announcement: Two free ways to get Gold Membership! Jan17-12 Meta Thread / Thread Starter Last Post Replies Views Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions... Feb23-13 09:24 AM micromass 1 25,481 Pinned: Intro. to Differential Equations ( 1 2 3 ... Last) My intent is to create a thread for people interested in Differential Equations. However, I will explicitly state that... Jul3-12 07:18 PM Luccas 95 120,106 Can you manipulate any exact equation to be a first order linear equation? if you are not concerned with which... Jun28-13 07:47 AM HallsofIvy 2 473 I have the differential equation: 4(2x^2 + xy) \frac{dy}{dx} = 3y^2 + 4xy The only thing I could see working is... Jun28-13 03:20 AM FeDeX_LaTeX 4 544 Hi everybody, Taking as a general definition of Morse-Smale (MS) diffeo: - finite chain recurrence set -... Jun27-13 02:59 PM arpharazon 1 366 -u''(z)+α2u(z)=f(z), u(0)=g(z), u(z)=0 as z→∞ -u''(z)+α2u'(z)=f(z), u(0)=g(z), u(z)=0 as z→∞ I am interested to... Jun27-13 01:28 AM Mute 2 538 can someone help me solve the differential equation that takes the following form? y''+Ay'+By+Cy^2=f(x), y is... Jun26-13 04:41 PM pasmith 5 565 Hi, In the study of dynamical systems, phase portraits play an important role. However, in almost all related... Jun26-13 11:31 AM pasmith 2 794 Hello. I don't know how to prove that a certain function is a solution to the scalar wave equation in cylindrical... Jun24-13 12:57 AM IridescentRain 4 743 I'm interested to know as much as possible about functions f:\mathbb{R}^2\to\mathbb{R} that satisfy the PDE ... Jun22-13 07:04 PM mfb 10 587 Hello I am stuck on an ODE involving substitution. I have done the correct substitutions, but have become stuck on... Jun22-13 12:19 AM smallzilla 2 482 Hello everybody, What is this equation called? I'm from non-English speaking country and I need to look up materials... Jun21-13 12:29 PM Goethe10 6 524 Hi I'd appreciate any help on identifying the type of PDE the following equation is... *This is NOT homework, it... Jun20-13 05:11 PM the_wolfman 3 472 Consider the PDE $$U_{xy}+\frac{2}{x+y}\left(U_{x}-U_{y}\right)=0$$ with the boundary conditions ... Jun19-13 01:27 AM abiyo 0 361 I would like to know whether this P.D.E is solvable and if yes, for which values of a. 2 (y Cos + x Sin) - 4 (y... Jun15-13 10:45 AM Kplex 0 565 After solving a DE I ended up with (y3)/(3x3) + ln(x) = c and initial conditions y(1) = 2. If I just plug in... Jun14-13 08:39 PM Chestermiller 3 530 Hello all, I'm working through old exams for an electrical subject (no solutions given) and I think I've gone wrong... Jun14-13 06:01 AM Nikarasu M 3 595 Hi all, it might be a silly question, but my math is "a bit" rusty. I want to find the equation of the volume lost... Jun13-13 06:10 PM hammal 4 591 Hello I need to plot this simple system: x'' = -x using midpoint Euler. u1 = -x , u2 = -x' Jun12-13 08:44 PM Chestermiller 1 595 i have an almost square region. By 'almost' i mean the edges are curvy, not completely straight. i now need to... Jun12-13 08:32 AM Chestermiller 1 443 Hi could do with a little help with this question please! The question A damped oscillation with no external... Jun11-13 02:25 PM bigfooted 3 560 What is the most general method of approximating arbitrary systems of ODEs of 4 variables(x,y,z,t) that fit these... Jun11-13 02:21 PM bigfooted 3 478 Hi All, Please I need your assistance to solve this PDE below: \frac{\partial^2 X}{\partial t^2} -... Jun10-13 05:27 PM dextercioby 6 596 Suppose you have the following definition of Dirac-delta function, or the so called sifting property: ... Jun10-13 07:12 AM Bipolarity 2 548 I have a book called REA 's problem solvers: Differential Equations Year 2004 and the problem 12-14 on page 244 might... Jun7-13 01:55 PM DiracPool 4 650 Hi everybody, I have an Ito's stochastic differential equation dX_t = a(X_t,t) dt + b(X_t,t) dB_t where... Jun6-13 01:26 PM mbp 0 383 Solve each differential equation. Express the general solution in explicit form. y' = (3x^2 -1) / (3+2y) So, I... Jun6-13 07:29 AM HallsofIvy 6 540 Hello I am trying to solve 2D Laplace's equation (\nabla2u) using Fourier series using these boundary conditions for... Jun5-13 10:27 PM Mute 12 1,742 I am working on the following problem: http://i4.photobucket.com/albums/y117/The0wnage/DE_zps79b1f9e4.jpg Can... Jun4-13 10:55 AM FOIWATER 5 562 Could someone suggest me an easy guide to transforming a system of differential equations into normal form around a... May31-13 07:23 AM marellasunny 0 523 Hi, I am trying to find the following integral of bessel functions, any help would be great: ∫H0(z)2/z dz Thanks May30-13 10:44 PM Mute 5 788 can any one help me with matlab code for for solving a state homogeneous differential ... May30-13 08:33 AM Mina Samir 4 508 Hey I have taken a programming course. And I have learned about Simpson, Trapezoidal and the midpoint rule etc, I... May30-13 06:23 AM HallsofIvy 3 609 Hi all, Had a doubt regarding Laplace's equation. In many textbooks, the general solution to the two dimensional... May29-13 09:12 AM physwizard 8 918 I stumbled upon this diff. equation, which is a function of speed (v). Is there a technique I can use to solve it? ... May29-13 01:42 AM JJacquelin 4 635 Hi! I would like to ask what is the general solution of the following differential equation \frac{\partial... May28-13 09:37 AM HallsofIvy 5 472 ∂u/∂x=∂u/∂y, can we ensure that u is a constant not dependent on x and y? May25-13 10:30 PM I like Serena 2 505 I have the following questions regarding Laplace's equation: 1) Given Dirichlet boundary conditions on a surface, is... May25-13 08:17 AM physwizard 0 523 hi, I could you some help with a basic problem please. it asks to verify that x*sin(y) = cos(y) is an implicit... May24-13 03:41 PM logan3 2 414 I'm trying to create a java application that models the path of a double pendulum. To do so I have been attempting to... May21-13 04:55 PM bigfooted 1 513 Greetings- In trying to solve a thermal stress problem, I have encountered an inhomogeneous differential equation of... May19-13 06:48 PM jasonRF 2 594 Hi there, my version of Mathematica may be too old and i'm not finding this one by hand so any help would be... May19-13 02:40 PM Goddar 4 499