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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
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 28,316
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
95 131,156
My question is in regards to systems of ordinary differential equations. One of my research topics right now involves...
Sep21-12 07:25 PM
Chestermiller
5 1,308
I have a trouble finding a method other than Variation of Parameters to solve y'' + 2xy' + (1+x2)y = 0. Does there...
Sep20-12 03:04 PM
HallsofIvy
1 965
I'm in truble with a partial differential equation. Actually it is a system of PDE but It would be useful to solve at...
Sep20-12 01:34 AM
L0r3n20
6 3,415
I am really confused with the concept of Neumann Boundary conditions. For the simple PDE ut=uxx for the domain...
Sep17-12 05:46 PM
tlonster
0 1,221
I am trying to solve: (x + 1 + f(-x) )(1 - f ' (x) ) = x+1 f(0) = x_0 x in (-1,1) I approximated it...
Sep15-12 11:54 PM
haruspex
5 1,481
I'm inverting this: Y = s2 + 15s + 17 / I'm using PF expansion, A/(s+1) + Bs + C/(s2 + 13s - 4), I however...
Sep14-12 10:48 AM
maistral
1 944
please help by telling me whether my approach to solve the problems are right or wrong. please refer to the ATTACHMENT...
Sep11-12 10:03 PM
chiro
1 1,209
For example, ODE: y'' + y = 0 solve this problem using MAPLE f(x) = _C1*sin(x)+_C2*cos(x) My question is...
Sep11-12 03:42 PM
nufeng
2 1,221
I am having major problems understanding these types of questions, where you will have water and in will be chemicals...
Sep10-12 09:59 PM
Chestermiller
6 1,713
Hi all, I've got a nonlinear differential equation of the general form y' + f(x)y + g(x) = h(x)(y^n) to...
Sep8-12 10:36 AM
bradbrad
2 1,410
Hi all Quick one, if one had an equation y' = x on could simply separate the variables and integrate. Now it the...
Sep7-12 06:07 PM
koab1mjr
2 1,365
hallo I ams earching analytical solution for system of two ODE in next form x*(dy/dr) - (y*y/r) =...
Sep7-12 01:23 AM
trentar
2 1,148
I had kind of a general question. Say I have a second order, homogeneous ODE. Say I use one of the general...
Sep5-12 01:51 PM
dumbQuestion
4 1,233
Hi, i'm writing a pseudospectral code to solve the inviscid burgers' equation with periodic boundary condition....
Sep5-12 10:34 AM
giordi
0 1,335
These DEs are the constraints on the functions C(r,\phi) and B(r,\phi) that zero an acceleration vector. ...
Sep3-12 05:32 PM
Mentz114
0 984
Ok I'm supposed to Solve this problem using Laplace Transforms. \frac{d^2 x}{dt^2}+2\frac{dx}{dt}+x = 5e^{-2t} + t...
Sep3-12 02:43 PM
geno678
4 1,359
Hello everyone! I am fairly new to SDE theory, so I'm sorry if my question may be a bit naive. I have the following...
Sep3-12 07:23 AM
sith
1 1,076
I am having confusion, so from what I understand for an exact DE dy/dx = some DE and you can manipulate it so that...
Sep3-12 05:08 AM
Simon Bridge
6 1,247
All, As part of my research I came up with a boundary value problem where I need to solve the following system of...
Sep1-12 01:13 PM
meldraft
18 3,023
Hello everyone, I am making use of Mathematica to solve differential equations developed by Lagrange method, I...
Aug31-12 09:19 PM
sky8754180
0 920
Would someone be able to help me with the quesiton Life cycle of butterfly is egg -> caterpillar -> butterfly....
Aug31-12 11:51 AM
Chestermiller
8 1,573
Hello All, I am new to this community but by reviwwing the questions and answers posted in this forum I was...
Aug31-12 06:39 AM
chiro
3 1,258
hi guys , i want to write a complicated differential equation as autonomous equations , is there any method ? i have...
Aug31-12 02:21 AM
voko
1 1,006
As expected, my text book and teacher are both lacking clear, concise examples for me to work with, so would someone...
Aug29-12 10:39 PM
ericm1234
2 1,151
Dear Brains I am working on fuel consumption maps to be included in vehicle simulation software to calculate the...
Aug29-12 07:36 AM
aLEx7
0 952
Hi! I have a system of four differential equations: \dot{x}(t)=Ax(t)+a where A\in R^{4x4} and a\in R^{4} are...
Aug29-12 05:25 AM
jacobrhcp
2 858
Folks, I am looking at the Ritz method for the following problem ##\displaystyle -\frac{d^2 u}{dx^2}-u+x^2=0##...
Aug27-12 12:28 PM
bugatti79
2 1,649
Hi, I'm really interesting of PDE, but I don't really know what I have to learn before start with PDE. I have learn...
Aug26-12 05:39 PM
Unstable
10 1,874
If given a cauchy euler equation (non-homogeneous) equation, does the approach in looking for a particular solution...
Aug26-12 03:51 PM
ericm1234
3 1,973
Hi there, I arrived at the solution for a electric potential problem for a semi-infinite cylinder (there was a...
Aug25-12 01:08 PM
OneMoreName
1 910
Hey guys, new here and this is my first post. Wondering if anyone could help me. So I've encountered a problem on...
Aug23-12 01:32 PM
AlephZero
3 1,115
Hello! When solving a PDE (for instance Maxwell's equations) using a commercial finite element tool, I have the choice...
Aug23-12 07:32 AM
daudaudaudau
0 1,159
I'm trying to solve a set of differential equations that all depend on a parameter, κ. I can use the system of ODEs to...
Aug22-12 04:50 PM
Chestermiller
4 1,921
Hi, Say I have this pde: u_t=\alpha u_{xx} u(0,t)=\sin{x}+\sin{2x} u(L,t)=0 I know the solution for the pde...
Aug22-12 04:28 PM
robl123
2 997
Hey gang, how would you specifically define what a non-linear DE is? I mean, what specifically qualifies a DE to be...
Aug22-12 04:03 PM
Unstable
4 928
Folks, I am stuck on an example which is partial differenting a functional with indicial notation The functional...
Aug22-12 03:26 PM
bugatti79
2 1,134
I need a little help on how does the iteration process. I know how Runge-Kutta 4 works, but I don't know how this...
Aug22-12 01:13 AM
maistral
7 1,349
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 1,024
Is there a different procedure of propagating error through differential equations or is it the same for a function?
Aug21-12 01:19 PM
JPBenowitz
0 783
Hi all, first of all, I have to admit I have often used this richness of knowledge that permeates through the posts...
Aug20-12 05:42 PM
Mute
5 1,379

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