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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
95 138,162
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 30,032
im looking for an exact analytical solution for the following (1/alpha) * dT/dt = d2T/dr2 + (1/r)*dT/dr where d...
Feb8-10 06:05 AM
gato_
20 3,998
I'm almost finished my calculus book (I'm self-teaching) and in the last 2 chapters it's giving a brief intro to...
Feb1-10 08:37 AM
omenka
6 2,757
hello... Can anyone tell me how can I simulate the laser rate equation with matlab? i allready wrote a code whics...
Feb3-10 03:16 PM
katla
21 18,058
Legendre equation: (1-x^2)y''-2xy'+n(n+1)y=0 Where -1< x < 1 General solution is y(x)=c_1 P_n (x)+c_2 Q_n (x) ...
Feb3-10 11:21 AM
yungman
14 2,740
Hello friends please attached file to see my problem
Jan26-10 04:06 PM
alokgautam
4 2,832
This is really difficult for me(at least for me), though it seems simple! Could anyone help me to solve it or give...
Jan26-10 07:25 AM
hyime
6 1,464
There is a linear version of so-called lattice Schrodinger equation (LSE), it is just a variation form of nonlinear...
Jan27-10 10:46 AM
elibj123
1 804
I have problem understand in one step of deriving the Legendre polymonial formula. We start with: P_n...
Jan29-10 07:08 PM
yungman
2 2,395
Y=a+b because Y,aa+Y,bb=0
Feb6-10 05:52 PM
torquil
1 1,020
Hi Most of my work in the past has been on 1D independent particle systems where I use matrix diagonalisation to...
Jan28-10 02:10 PM
elibj123
1 5,423
Can anyone help me to solve the PDE via Inverse Scattering transform method?
Feb4-10 04:19 PM
kurniliya
1 1,143
I have a set of ten dependent variables x1, x2 ... x10 and an independent variable t. The differential equations are...
Jan29-10 09:13 AM
rkrsnan
1 3,795
Hi, I'm looking for a solution to u_t + A u_x + B (u - f) = 0 where f is a given function linear in x and...
Jan30-10 08:13 AM
Tunneller
2 1,432
I was stuck on a problem in my Diff Eq book and I asked my teacher for some guidance. This was the problem: Let M...
Jan30-10 11:49 AM
farleyknight
0 810
We would like to invite anyone with an interest in ordinary differential equations (ODE) teaching and research to...
Jan30-10 07:23 PM
palais
0 981
whenever i see that integrating factor for solving a linear differential equation with eint. p(x) dx and then...
Jan31-10 10:30 PM
bennyska
2 1,125
So I've always done simple ODEs by the method of separation of variables. You know, dy/dx = A*y dy/y = A*dx...
Feb2-10 09:41 PM
LCKurtz
2 2,442
I am not interested in the solution, but I am curious what makes: uiv = u, a 4th-order ordinary differential equation....
Feb4-10 11:50 AM
torquil
8 1,759
Hello everyone! Having a field \bf B = \nabla \times \bf A , how is it possible to get \bf A ? For constant...
Feb2-10 06:05 AM
Phrak
5 4,980
ive been given this question for a uni assignment: given the function: f (x) = 5(x^1.3) +1.5(7x − 3)+ 3(e^− x) +...
Feb8-10 02:38 PM
alsatron
2 6,988
Hello dear friends, I have this PDE Can anyone help me in finding what type PDE is it. So that I can try to...
Feb11-10 12:44 PM
kosovtsov
7 1,862
Hi could someone please explain how this can be done please 1. The population P satisfies the differential...
Feb4-10 03:21 AM
elibj123
1 867
Hello, I have a inverse Laplace transform problem: F(s)=1/s^2*exp. I tried some ways but didn't find right answer....
Feb4-10 07:20 AM
luhug2
0 997
I am trying to solve (1) U_t = 2bU_xy (as part of U_t = aU_xx + 2bU_xy + cU_yy) using centred finite difference...
Feb10-10 11:38 AM
RedBranchKnight
0 1,021
I have to set up a differential equation for a leaking cylindrical container that is being refilled at a constant...
Feb7-10 02:46 PM
torquil
3 2,161
Hello everyone and thanks for looking at my thread, I had some trouble solving this ODE which was in a textbook by...
Feb10-10 10:29 AM
IttyBittyBit
2 901
My professor yields this equation. d^2z/d0^2+1=0. This problem has to do with heat conduction. So a plane sheet...
Feb10-10 02:36 AM
torquil
1 4,742
d20/de2+1=0 and the boundry condition is -d0/de(evaluated at e=+/- 1)=+/-H0(evaluated at +/-1). The final result...
Feb8-10 12:00 AM
juice34
0 992
The claim is: |Δu|≤ sqrt(n)|D^2(u)| where we regard Du as a gradient vector and we regard the elements of D^2(u) as...
Feb8-10 01:14 AM
RAT(16am
0 1,041
Hello, I'm having problems with a D.E. question, I'm asked to solve the equation: \left(1+y^{'2}\right)y=k^{2}...
Feb9-10 03:57 AM
gato_
1 1,737
What is the meaning of \;\;\frac{\partial u}{\partial t}(x,0) Is it equal to \;\;\frac{\partial u(x,t)}{\partial...
Feb11-10 09:37 AM
Lord Crc
3 1,341
In am studying PDE and I have question about D'Alembert solution for one dimension wave equation. I am going to...
Feb16-10 11:47 AM
yungman
7 3,178
i need to solve the follow diferential equation: (\frac{du}{dy})^2=A+Be^{2u}+C \sqrt{D+Ee^{4u}} where A,B,C,D,E...
Feb16-10 09:07 AM
alejandrito29
6 1,018
I want to write a program in C that's going to solve 3 second order differential equations, and I have little to no...
Feb13-10 02:29 PM
WraithM
4 2,249
LaTex Code: \frac{\partial U}{\partial t} + ax\frac{\partial U}{\partial x} + b\frac{\partial^2 U}{\partial x^2} = 0 ...
Feb12-10 12:17 PM
kosovtsov
1 1,991
I've come across a very ambiguous statement in my notes on implicit functions (part of the partial derivatives part of...
Feb13-10 04:48 PM
raymo39
8 2,987
Hi, I have an excel spreadsheet that calculates the pressure inside a piston chamber, that is a function of time. I...
Feb15-10 10:53 AM
a.mlw.walker
7 1,304
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 1,049
Hi there, could anyone help me on this particularly frustrating problem I am having... I have a linear parabolic...
Feb16-10 03:29 AM
nixs
0 2,034
Hello Everyone trying to come up with a stratagey to solving this integral Int(x^3*J3(x),x) no limits Ive tried...
Feb16-10 08:44 PM
Astronuc
2 1,466

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