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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
95 136,519
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 29,554
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 1,054
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 1,054
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 1,054
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 1,054
Prb:(x^4+4*x^2+16)y"+4(x-1)y'+6xy=0 P=(x^4+4*x^2+16) Q=4(x-1) R=6x P=0 for - 1 - 3^(1/2)*i 1 -...
Jul22-12 02:37 PM
HallsofIvy
1 1,054
Hi guys, Here is an equation that I have tried for few days to solve and still haven't succeeded, I'm interested...
Mar28-13 11:55 PM
Simon Bridge
9 1,054
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 1,053
Is the Airy function (of the first kind) normalized? If I take the integral Ai(x) dx on the entire axis, does it...
Sep18-13 12:56 PM
Irid
2 1,053
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 1,052
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 1,052
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 1,052
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 1,052
Hi, so the problem is this: I am trying to solve (analytically) the wave equation with c=1: u_{xx}=u_{tt} on...
Mar25-13 12:05 PM
Gengar
1 1,052
Given a function: z(x,y) = 2x +2y^2 Determine ∂x/∂y , Method 1: x = (z/2) - y^2 ∂x/∂y = -2y Method 2:
Nov14-13 06:05 AM
SteamKing
8 1,052
Hello all, I was wondering if you could share your thoughts regarding how one should go about solving PDEs in which...
Oct28-10 02:20 PM
masnet
0 1,051
Find the Particular Solution. Show the steps of derivation, beginning w/ the general solution....
Nov23-10 12:10 PM
Matthew Rodman
1 1,050
Hi Mathematicians, I recently encountered this problem in maximization... Maximize 1170X1 + 1110X2 Subject to 1. ...
Feb2-11 07:34 AM
chwala
2 1,050
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 1,050
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 1,050
Something has been bothering me. I see a phrase like this: Plugging our two roots into the general form of the...
Oct17-13 02:44 PM
mesa
3 1,050
Dear All, I need help on the following issue. Assuming the flow to be potential, I want to compute the potential...
Mar20-09 06:28 AM
mathf
0 1,049
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 1,049
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 1,049
I'm having trouble finding out how to set up Neumann (or, rather, "Robin") boundary conditions for a diffusion-type...
Nov12-12 10:58 AM
Vargo
1 1,049
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 1,048
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 1,048
(reposted in the Homework/Coursework forum)
Aug26-09 10:24 AM
jahnybrew
0 1,047
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 1,047
I want to solve the boundary value problem: Laplace's equation for u(r, theta) = 0, 1 < r < 2, 0 < theta < a ...
Apr22-11 11:31 AM
Engineer214
2 1,046
I want to know is it important to study D'Alembert solution? My main goal is to study Electromagnetics and wave...
Feb24-10 07:39 PM
truth is life
1 1,046
hi guys i cannot solve this. say that y'' + y = g(t) derive the formula y(t) = c1*cost + c2*sint + convolution...
Jul28-10 12:48 PM
Dickfore
2 1,046
I have been thinking about numerical methods for ODEs, and the whole notion of stability confuses me. Take Euler's...
Nov29-12 09:48 AM
Master J
3 1,046
Hi, I am not sure if this is the correct forum, but... I am working with FFTs of real signals. I have a FFT of...
Oct21-13 11:13 PM
swraman
7 1,046
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 1,045
I've taken a first semester course on PDEs. Basically all we learned was separation of variables and method of...
Apr19-11 07:04 AM
AlephZero
1 1,045
If one were to solve an iterative system, how would they do so. I'm studying them, and am wondering how to find fixed...
Mar11-10 07:23 AM
tiny-tim
1 1,043
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 1,043
We did this new mathematics thing in class today which I did not understand, it came under the topic of...
May8-05 08:31 AM
arildno
5 1,042
I have the solution (a potential) for a nonlinear differential equation found at r=0. How can I calculate the...
Jun27-09 03:56 PM
Bob_for_short
1 1,042
When you study physics, you never really delve into the reasons behind some of mathematical identities, i was curious...
Feb14-10 01:35 PM
elibj123
1 1,042

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