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Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
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Jan16-12 Greg Bernhardt
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
95 138,495
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 30,172
Explain differential equation of order 3? With example?
Nov26-08 05:02 AM
HallsofIvy
1 1,075
Hello Don't think this is homework, because I just want to know whether or not it has a solution (x^2 + x + 1)y''...
Apr25-11 04:28 AM
JJacquelin
5 1,075
Hello everyone, I am solving an eigenvalue problem. Right now, I would like to know; How to determine the...
May23-11 06:05 PM
Urkel
0 1,075
Hi, I want to solve the following wave equation: u_{tt} - c^2 u_{xx} = f(x,t)u What is the best way to do it?...
May28-11 11:00 AM
Tohiko
2 1,075
Hi friends. I am working on Neighborhood Filters and the NL-means algorithm but it's not going for me. I got...
Jan23-12 12:51 PM
parazit
0 1,075
I've been trying (unsuccessfully!) to rearrange the following equation so that H is the subject: mgH = / 2 ...
Mar24-10 10:24 PM
hotvette
1 1,073
I am solving a problem involving Lagrange Multipliers and calculus of variations and have the equation: f_{x} -...
Feb1-12 04:45 PM
shank8
0 1,073
Haiya :P In the process of trying to find the solution of a 1st order PDE, I've reached a point where I have to...
Sep29-09 05:02 AM
BobbyBear
5 1,072
Hey guys, I have a pretty simple question but I can't seem to find the answer anywhere. is y''+xy'-5=(x^2)(e^y)...
Jan22-10 09:07 AM
matematikawan
2 1,072
so im working on a problem and i have a question about the step function. lets say that a decaying force is f(t). with...
Nov22-11 12:49 AM
I like Serena
1 1,072
Hello guys, Which method can we use to solve the differential equation below? dy/dx= 1/(xy+x^2y^3) It doesn't...
Apr7-05 09:07 PM
Lyuokdea
5 1,071
Hi Everyone, Apologies if this is posted in the wrong place. I am trying to produce numerical solutions for the...
Jan25-11 10:37 AM
rs12345
0 1,071
Hello, What does laplace transformation exactly 'do'? If I have PDE of second order and use LT on it, what do i...
Dec4-11 05:02 PM
hunt_mat
1 1,071
I'm having trouble understanding the concept of laplace transformations. my book states that it is comparing how...
Apr26-05 09:04 PM
Corneo
1 1,070
Ok, I know how to separate variables in solving an ODE. I am unable to understand a solution I have for a problem...
Jul13-12 06:29 PM
ericm1234
2 1,070
I don't understand what my professor told me. He said that if a fourieer series of a function f is not continuous then...
Dec8-09 11:13 PM
LCKurtz
4 1,069
Can anyone tell me if this ODE has an analytic solution? And if it does, how the heck might I go about it? ...
Dec10-10 06:46 AM
JJacquelin
4 1,069
I'm trying to solve this equation: Ux + Uy + U = e^-(x+y) with the initial condition that U(x,0)=0 I played...
Apr12-10 08:09 PM
gato_
2 1,068
Hi all, I'd like to solve the following problem in 3 dimensions: \partial_t u(r,t) = D\Delta u(r,t) u(r,0) = 0...
Jul26-13 12:18 PM
mfb
3 1,068
I'm studying linear elasticity and I came across an equation that I having problems figuring out the derivation. I...
Sep9-13 10:09 PM
Chestermiller
10 1,068
I am trying to solve an ODE and PDE and I am having problems coming up with a method for doing so. The PDE is: ...
Jun30-13 07:53 AM
dm164
5 1,067
can any one know how to derive the Lax pair for the cubic nonlinear schrodinger equation? currently I am interested...
Mar16-11 07:23 AM
saravanan13
0 1,067
Is this problem possible? Solve the initial value problem x''(t) + 6x'(t) + 9x(t) = f(t); x(0) = N, x'(0) = M ...
May18-11 04:35 AM
JJacquelin
1 1,067
Having a bit of trouble with this equation, I need to find V explicitly and this would obviously be done by...
Apr28-12 08:40 AM
JJacquelin
5 1,067
Hi friends, I have been trying to solve the ode of second degree below: d2y/dz2=(i/a*z+b)*y i is the complex...
Oct18-11 06:43 PM
bloodlines
4 1,066
Hello, I am trying to write a program on matlab using ode45 to solve the following equations: S'=-bSZ-sS...
Aug26-11 11:21 PM
klinklindeman
0 1,066
I was going through my notes on different finite difference methods and came across something I don't quite...
Feb26-12 11:54 AM
O_chemist
0 1,066
I would like to ask if anybody knows something about the methods of solving infinite linear autonomous systems of...
Jul31-13 12:01 PM
Mandelbroth
3 1,066
For a general dynamic system: dXi/dt = Fi(X1, X2,...,Xn), i=1,...,n, Q.1 do you have some ideas of the existence...
Jun29-11 01:36 AM
Eynstone
1 1,065
Eq u'(x)+p(x)u=f(x) with initial condition u(0)=0 It's homogenous solution is u_h=Ce^{-\int^x_0 p(s)ds}
Jan7-12 05:14 PM
matematikuvol
3 1,065
Hello guys, I am new here to the forum and I was wondering if you could help me with some trouble I am having with...
Oct29-10 11:56 AM
Funzies
2 1,064
Hi everyone, I have an equation that contains the derivative of the Bessel Function of the first kind. I need to...
Nov19-12 07:26 AM
KyleS4562
2 1,064
Hello, In my Differential Equations class we are learning about modelling with first order differential equations....
Sep28-13 02:55 AM
UltrafastPED
3 1,063
Can anyone help me with a simple algorithm or code for a Finite difference Time domain scheme to implement in Matlab....
Jun30-08 01:23 PM
chitambira
0 1,062
So this question pertains to some process engineering homework i have, which is basically the following: I have an...
Feb5-09 12:09 AM
matematikawan
1 1,062
There seems to be something wrong with the LaTeX This seems like an absolutely trite question, but I can't seem to...
Jun3-09 06:26 PM
dev00790
1 1,062
Hi I have been trying to figure out how this method works. Searched the forum but got no results. Have attached an...
May15-10 11:40 AM
LCKurtz
3 1,062
Hello all, During the course of a calculation I was doing for my research, I derived a delay integral equation of...
Jul15-10 02:58 PM
Mute
2 1,062
Hello all, I am trying to solve the FPE in 2D, The equation is (with implied summation over repeated indices):...
Aug21-12 02:59 PM
sokrates
0 1,062
I'm trying to solve the heat conduction formula in 3 dimensions when there is constant generation from electrical...
Feb1-13 01:03 PM
pasmith
2 1,062

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