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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
95 138,366
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 30,126
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 6,350
Apparently Torichelli made a therom that has something to do with flow rate out of containers. Can anyone help me with...
Nov10-04 12:30 PM
Clausius2
1 6,330
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 6,324
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 6,319
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 6,305
Hi, I desperately need help to solve the following differential equation for buckling of a beam with a uniform...
Jun30-14 06:51 AM
AlephZero
20 6,294
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 6,289
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 6,248
Wrong section, sorry!
May14-09 06:12 AM
nada
1 6,237
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 6,224
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 6,221
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 6,180
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 6,175
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 6,149
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 6,120
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 6,095
Hi Can any one please help me to solve the quasilinear partial differential equation: ...
Jan14-08 06:20 PM
rezwan
0 6,075
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 6,060
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 6,044
How to use power series to solve this non-linear differential equation?
Aug11-08 09:47 AM
Matthew Rodman
3 6,040
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 6,014
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 6,013
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 5,984
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 5,978
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 5,971
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 5,949
Can someone recommend to me a good textbook for Ordinary Differential Equations? One that easy easy to read. We are...
Oct28-04 11:38 AM
ReyChiquito
1 5,947
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 5,946
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 5,936
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 5,928
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 5,925
i have 2 questions 1. what does a, b, m, n represent in the following Lotka-Volterra model: \frac{dx}{dt} = (a -...
Aug14-07 06:07 PM
arildno
6 5,922
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 5,920
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 5,915
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 5,900
Hi! I have a serious problem solving the following system of differential equations: ...
Nov24-04 07:01 PM
Dr Transport
7 5,889
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 5,879
I know nothing about DEs, so this may be a silly question. I'm given some time varying (x_t)_t and a constant r,...
Oct13-13 06:18 PM
economicsnerd
3 5,876
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 5,865
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 5,859

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