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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
95 139,030
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 30,398
Hi, could someone please link me to the relevant theorems etc (or explain personally) that answer the issue that...
Apr4-11 07:15 PM
Ben Niehoff
1 1,086
I'm a theoretical biologist in the process of developing a spatial model for animal movement. So far, I've arrived at...
Apr24-11 03:40 AM
JJacquelin
3 1,086
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 1,086
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 1,085
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 1,085
How can we say: f(x)=A'sin(kx)+B'cos(kx) or equivalently f(x)=Ae^{ikx}+Be^{-ikx}?? How are these two...
Nov18-12 04:44 AM
M. next
6 1,085
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 1,085
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 1,084
What method can I use to analytically solve the following 2nd order PDE? u=u(x,t) ∂u/∂t - a*x*∂u/∂x-D*∂^{2}u/∂t^{2}...
Oct30-11 03:05 AM
pangyatou
1 1,084
Hello I have no experience in solving such equations, the equation in question is \frac{dv}{dt}=-\alpha v +...
Oct30-11 11:30 AM
johnt447
0 1,084
is this the wriye formula of cofficient of friction 22/7 x D x n/12
May16-09 06:40 AM
HallsofIvy
2 1,083
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 1,083
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 1,083
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 1,083
Hi all, Suppose the solution of a pde exists and is unique, what can be said about the smoothness thereof? In...
Nov30-09 05:54 PM
Hootenanny
1 1,082
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 1,081
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 1,079
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 1,079
Hi everyone, Im looking for an autonomous first order ode that has the following properties. For dependent...
Jan25-13 12:38 AM
JJacquelin
7 1,079
Explain differential equation of order 3? With example?
Nov26-08 05:02 AM
HallsofIvy
1 1,078
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 1,078
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 1,078
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 1,078
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 1,077
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 1,077
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 1,077
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 1,076
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 1,076
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 1,076
Hello, I am looking to apply to heat equation to a cylindrical rod and solving with explicit finite difference scheme....
Apr30-13 03:48 PM
bigfooted
4 1,076
Hello everyone, I have the following differential equation : \dot{\theta}(t) = \omega(t) -...
Aug20-09 03:14 PM
Feldoh
6 1,073
Hello there, I am solving numerically the ODE $$ \dot{y} = min \, (y, A) + B\, sin(t)$$ , A,B being constant. ...
Nov29-12 01:26 PM
Mute
1 1,073
Just a question that came to my mind while studying differential equations. Of-course this is a silly one (I...
Oct15-11 03:11 PM
HallsofIvy
1 1,072
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 1,072
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 1,072
Hello, In my Differential Equations class we are learning about modelling with first order differential equations....
Sep28-13 02:55 AM
UltrafastPED
3 1,072
Hey guys, I'm sure i'm doing something really daft in not getting this to work, but... I want to use NDSolve to...
Jul5-10 02:39 PM
rabbahs
1 1,071
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 1,071
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 1,071
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 1,071

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