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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
95 133,217
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 28,784
The following seemed simple enough to me . . . I'm somewhat sure about the requisite physics, but shakey on the...
Jul22-04 10:26 AM
cj
7 6,294
Hi all, For my thesis I would like to solve the following second order nonlinear PDE for V(x,\sigma,t): ...
Jul13-09 09:40 AM
mathy_girl
18 6,287
Hi, I have a basic ODE: y''(x)+\frac{1}{4}y'(x)=f(x) on 0<x<L With Boundary conditions:
Oct11-06 01:07 PM
romeo6
4 6,275
Ok, so I am dealing with a critically damped oscillator in which the natural frequency(w) of the oscillator is equal...
Feb3-04 07:05 AM
himanshu121
2 6,227
Hello! I got one question for you. How come that (f \circ g)'(x) = f'(g(x)) g'(x) ? Since (f \circ...
Aug10-11 12:25 AM
dimension10
11 6,223
I am having trouble with some of my homework. I am not quite sure how to find the damping ratio from a third order...
Sep7-11 11:42 PM
twillkickers
0 6,212
Hi all. I am studying the use of split step fourier method to solve NLS-typed equations. One problem is that, for...
Feb18-08 02:49 PM
n0_3sc
1 6,205
Whether somebody knows what equally <int(F*Fcomp)dx>. Where F(x,t) is complex function: F=F1+i*F2,...
Feb10-04 12:56 PM
Alexey
0 6,162
Hello all, This is my first post... I am trying to make a code to numerically solve a problem, which is a heat...
Jan4-07 10:05 PM
windowless
0 6,148
When one compares the fundamental solution for Laplace's Equation one might note that in 2 dimensions this solution...
May9-09 07:52 AM
starzero
2 6,137
Hi guys! im getting stuck in solving the following Linear Partial Differential Equation: 2p+3q=x+y+1 now...
Sep14-06 04:57 AM
kosovtsov
1 6,109
In my research, I'm using a modified version of the wave equation: \ I would like to take this PDE,...
Apr19-09 06:44 PM
nkinar
3 6,108
Hi Can any one please help me to solve the quasilinear partial differential equation: ...
Jan14-08 06:20 PM
rezwan
0 6,043
Well, i realy i am pissed at the moment because of this. I have been trying to figure out if there is a...
Sep24-10 02:27 AM
notpigfly
16 6,028
Hi everyone, I need some help solving a bessel function of the 1st order. The equation is used to calculate the mutual...
May10-09 09:33 AM
nada
5 6,025
To calculate a p.d.f. of a r.v., I need to integral a product of two bessel function as \mathcal{L}^{-1} \left(...
Jul29-08 12:13 AM
birisi11
1 6,016
How to use power series to solve this non-linear differential equation?
Aug11-08 09:47 AM
Matthew Rodman
3 6,015
How i can solve a system of 6 first order differential equations by using numerical techniques like Euler method,...
Jul1-05 11:27 AM
saltydog
2 5,993
http://img258.imageshack.us/img258/3518/01ck5.png I would like to build a logistic differential equation for US oil...
Feb19-08 03:18 PM
coomast
5 5,979
I feel so embarrased asking this question, but this is the place to get answers. I have a 2nd order ODE with a...
Jan29-05 11:12 AM
saltydog
4 5,973
Hello i have a question : dx/dt=(a*x)+(b*y)+(c*z) dy/dt=(d*x)+(e*y)+(f*z) dz/dt=(g*x)+(h*y)+(i*z)
Oct15-05 05:26 AM
saltydog
17 5,957
Hey, I have no idea where to start, for this question. I know that I will probably have to use vector and scalar...
Jun21-05 02:53 PM
mustafa
2 5,956
Hi, I am solving a second order ODE. the result I got is an exponential to the power of a real and an imaginary part,...
May11-05 03:48 PM
dextercioby
7 5,942
I am reading a text about Laplace transform in solving differential equations. Seems that this method is so powerful....
Jun11-09 12:42 PM
Mute
4 5,932
1.Use implicit differentiation to find the equation of the tangent line to the curve xy^3+xy=16 at the point (8,1) ....
Oct22-07 11:39 PM
rocomath
1 5,902
Hi All, I have a differntial equation that I came up with on a little engineering problem posted here...
Aug23-06 07:43 PM
HallsofIvy
4 5,886
Hi, I'm trying to find an analytical solution of Laplace's equation: \phi_{xx} + \phi_{tt} = 0 with the...
Dec8-07 06:37 PM
coomast
4 5,873
guys please help me, i'm trying to solve a simple moving PDE equation in matlab. The equation i'm trying to solve is...
Feb18-10 09:40 PM
kribosgiros
5 5,865
Everybody knows one dimensional wave equation \frac{\partial^2u}{\partial t^2} = c^2 \frac{\partial^2u}{\partial x^2}...
Apr27-10 09:06 AM
Hootenanny
1 5,862
Hi! I have a serious problem solving the following system of differential equations: ...
Nov24-04 07:01 PM
Dr Transport
7 5,861
I'm stuck on what to do here. The question reads Consider a population P(t) satisfying the logistic equation dP/dt =...
Apr8-09 06:25 PM
doubedylan
4 5,855
can anyone give me the most simple for someone with little diffrential equations back ground, on the proof for where...
Oct10-04 05:36 PM
leoflc
7 5,850
Wrong section, sorry!
May14-09 06:12 AM
nada
1 5,837
I am sure most of you are familiar with the equation: m(x)''+c(x)'+k(x) = 0. Then, we create an auxillary equation...
Oct6-07 12:37 PM
HallsofIvy
2 5,822
Hi. I believe I understand separation of variables for a first order DE. But can anyone tell me how to use it on a...
Jul22-10 12:20 AM
ross_tang
2 5,821
For a second order linear differential homogeneous equation, if the two solution y1 and y2 is a multiple of one...
Feb10-09 09:54 PM
Emreth
4 5,814
Hi, I am currently taking a class which is now covering PDE's and I think I need more sample or example problems that...
Nov14-06 09:35 AM
Einstein Mcfly
2 5,800
I need help to solve this coursework: MATLAB PROGRAMMING COURSEWORK OBJECTIVES:  Learn to solve engineering...
Dec9-11 04:41 PM
losky88
5 5,779
i cant seem to figure this out... if the differential equation dy/dx= y-2y^2 has a solution curve y=f(x)...
Apr8-07 06:31 PM
Data
3 5,754
Hey everyone, I got the following fourier series F.S f(x)= (pi/2) - (4/pi) \sumn=1,3.. to infinity (1/n^2 cos...
Feb20-08 12:29 PM
dhris
6 5,750

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