# Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
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 Views: 8,476 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 25,446 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 95 120,027 Dear, I work as a process engineer and havent had to use differential equations or integrated anything for years. I... Jun13-12 05:15 PM Jacob86 0 1,529 I need help from any one urgently, I need C code for Solving Poisson Equation has known source with Neumann condition... Jun12-12 09:11 AM samia2008 6 2,623 Hello everyone! So today is was my first day of differential equations and I understood most of it until the very... Jun11-12 11:04 PM shaqywacky 3 1,298 I have a pressure flow problem where I'm trying to understand the velocity profile of a fluid in an annular space... Jun9-12 04:01 PM bigfooted 5 1,532 I tried all my mathcad software such as Maple and I can't seem to find a solution to this time based differential... Jun8-12 04:31 PM hunt_mat 3 1,230 I have thought of an interesting way of solving n-th order linear differential equations (with constant coefficients)... Jun8-12 03:57 PM rajb245 9 2,623 I have quite some trouble thinking why we are allowed to manipulate differentials as we see fit when solving... Jun8-12 02:24 PM pondhockey 9 2,710 PDE : Can not solve Helmholtz equation (This is not a homework. I doing my research on numerical boundary integral.... Jun7-12 07:17 PM sompongt 3 2,649 its from thermodynamics...but i dont think you really need to understand thermodynamics to figure out what math trick... Jun7-12 07:03 AM genericusrnme 3 1,032 Hi all! Studying the Frenet formulas I have concluded that they are recursive. More specifically, using the... Jun7-12 02:17 AM Abel Cavaşi 0 1,026 Hi, I need some help understanding the solution to a problem. Equations: x = r.cos(θ) y = r.sin(θ) r = x2... Jun7-12 02:13 AM adamwitt 4 2,781 I haven't worked with partial derivatives since high school 25 years ago so I'm quite a bit rusty and need a little... Jun6-12 08:51 PM HallsofIvy 2 1,120 Hello, it goes like this: x^2y'' + 2xy' +(2x+1)y = 1 If I use Laplace Transform... I know that L(y'') = s^2F(s)... Jun6-12 01:29 PM JJacquelin 9 1,744 Attempting to solve dx/dy = x/y - √{1 + (x/y)^2} I can substitute x/y = z and get ln(y/c) = arcsinh(z) c... Jun5-12 08:55 AM macilrae 12 1,409 We have this system of equations: \begin{cases} x'= -x + 2y & (1)\\ y' = -2x - y + e^{-t} & (2) \end{cases} ... Jun4-12 11:42 PM charbel 1 1,984 I got trouble in dealing with this kind of system. For example, Ay+By`+Cy=0 where y=transpose(y1 y2) A=(1 0 ... Jun4-12 12:46 PM theorem4.5.9 4 1,144 can non linear differential equations have analytic solutions? In fact, can you please explain why is it so? Thanks... Jun4-12 12:16 PM kundukoustav 1 1,010 Hi All, I’m implementing a code to solve the equation of motion using the 4-step Adams-Bashforth method. Here’s my... Jun4-12 12:09 PM AlephZero 1 995 Hello I'm trying to figure out how to evaluate(in the distribution sense) \delta'(g(x)). Where \delta(x) is the dirac... Jun3-12 05:35 PM Vargo 5 3,692 Hello! On Pauls notes webpage, there is the following problem to be solved by variation of parameters: ... Jun3-12 03:39 PM tiny-tim 3 1,257 Consider the equation \frac{a_n-a_{n-1}}{1+a_na_{n-1}}=\frac{1}{2n^2} I know one special solution is... Jun3-12 09:07 AM asmani 10 1,224 Wrong section, sorry! First time user. Jun3-12 02:22 AM tiny-tim 3 1,173 Alright. I understand that if we have a differential equation of the form ... Jun2-12 12:41 AM Vargo 5 1,495 We know that the \mathcal L\{f(t)\} = \int^{\infty}_0 e^{-st}f(t) dt. Say we want to, for example, solve the... Jun1-12 07:47 AM Hiche 1 1,032 can we use only frobenius method to solve bessel equation? Jun1-12 06:39 AM HallsofIvy 7 1,982 Ok, this should be quite simple. I've been looking at this problem for quite some time now, and I'm tired.. Please... May31-12 06:56 AM HallsofIvy 3 1,217 Could someone give me some hint (or some reference) about the study of regularity of weak solutions of (*)\quad... May29-12 05:35 PM Goklayeh 0 1,323 They give a differential equation: x' = f_a(x) = ax(1-x) . In determining if the equilibrium points are sources or... May29-12 04:38 AM Simon Bridge 5 1,634 How do I take the inverse laplace transform of something that looks like this? It's part of a larger... May28-12 06:33 PM hunt_mat 3 1,204 Hey, I need your help to solve the following set of coupled differential equations numerically. ... May28-12 06:30 PM hunt_mat 5 2,483 Dear Friends i am trying to solve two first order differential eqs. with one algebraic eq. i am able to get... May27-12 06:26 PM rickyvery 2 1,412 hey, can someone explain to me how mathematicians found out that for second order homogenous ODEs with constant... May26-12 08:00 PM algebrat 2 1,739 I'm trying to write a code to implement he backwards Euler method to integrate the equation of motion. The sticking... May26-12 08:04 AM AlephZero 2 1,310 Problem: Solve the initial Value: when x=1, y=0 dy/dx = 1 2x^2(d^2y/dx^2) + 3x (dy/dx) - 15y = 0 My attempt: ... May25-12 09:21 AM HallsofIvy 13 2,367 like for example if we had a 2nd order differential equation is it possible that we can have more than 2 non-trivial... May23-12 05:47 PM AlephZero 3 1,481 Hi, Just wanted to verify my process to complete the Fourier series in complex form. With the Function f(t) = 8,... May23-12 10:35 AM JamesEllison 0 1,182 I've completed my Engineering but doing a self study course in Dynamics of Structures and have got a very fundamnetal... May23-12 12:39 AM yus310 4 1,380 Help pls decide this Differential Equations!I did not coincide with the answer and in some no idea how to do! will be... May22-12 06:34 PM haruspex 4 1,111 I tried to solve it but confused. Pls. help me to solve this equation: dy/dx + (e^x)*Sec(y) = Tan(x); (hint:... May22-12 04:40 PM jackmell 3 1,174 Dear Sirs, How to include the coupling coefficient of coupled mode equation in linear operator (or where ever it... May21-12 11:51 PM joshvaraj 0 1,045

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