
My intent is to create a thread for people interested in Differential Equations. However, I will explicitly state that...

Jul312 07:18 PM
Luccas

95 
138,247 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
30,064 
What method can I use to analytically solve the following 2nd order PDE?
u=u(x,t)
∂u/∂t  a*x*∂u/∂xD*∂^{2}u/∂t^{2}...

Oct3011 03:05 AM
pangyatou

1 
1,072 
Haiya :P
In the process of trying to find the solution of a 1st order PDE, I've reached a point where I have to...

Sep2909 05:02 AM
BobbyBear

5 
1,071 
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...

Oct2113 11:13 PM
swraman

7 
1,071 
Hello guys,
Which method can we use to solve the differential equation below?
dy/dx= 1/(xy+x^2y^3)
It doesn't...

Apr705 09:07 PM
Lyuokdea

5 
1,070 
HI guys. Haven't been here in a while...
I have an algorithm attached that uses the levenberg marquardt non linear...

Feb513 01:49 PM
a.mlw.walker

0 
1,070 
I'm having trouble finding out how to set up Neumann (or, rather, "Robin") boundary conditions for a diffusiontype...

Nov1212 10:58 AM
Vargo

1 
1,070 
Given a function: z(x,y) = 2x +2y^2
Determine ∂x/∂y ,
Method 1:
x = (z/2)  y^2
∂x/∂y = 2y
Method 2:

Nov1413 06:05 AM
SteamKing

8 
1,070 
Hey guys,
I have a pretty simple question but I can't seem to find the answer anywhere.
is
y''+xy'5=(x^2)(e^y)...

Jan2210 09:07 AM
matematikawan

2 
1,069 
I am solving a problem involving Lagrange Multipliers and calculus of variations and have the equation:
f_{x} ...

Feb112 04:45 PM
shank8

0 
1,069 
I don't understand what my professor told me. He said that if a fourieer series of a function f is not continuous then...

Dec809 11:13 PM
LCKurtz

4 
1,068 
so im working on a problem and i have a question about the step function. lets say that a decaying force is f(t). with...

Nov2211 12:49 AM
I like Serena

1 
1,068 
I'm having trouble understanding the concept of laplace transformations.
my book states that it is comparing how...

Apr2605 09:04 PM
Corneo

1 
1,066 
I'm trying to solve this equation:
Ux + Uy + U = e^(x+y) with the initial condition that U(x,0)=0
I played...

Apr1210 08:09 PM
gato_

2 
1,066 
Hi Everyone,
Apologies if this is posted in the wrong place.
I am trying to produce numerical solutions for the...

Jan2511 10:37 AM
rs12345

0 
1,066 
Hello,
What does laplace transformation exactly 'do'? If I have PDE of second order and use LT on it, what do i...

Dec411 05:02 PM
hunt_mat

1 
1,066 
Can anyone tell me if this ODE has an analytic solution? And if it does, how the heck might I go about it?
...

Dec1010 06:46 AM
JJacquelin

4 
1,065 
Is this problem possible?
Solve the initial value problem
x''(t) + 6x'(t) + 9x(t) = f(t); x(0) = N, x'(0) = M
...

May1811 04:35 AM
JJacquelin

1 
1,064 
Having a bit of trouble with this equation, I need to find V explicitly and this would obviously be done by...

Apr2812 08:40 AM
JJacquelin

5 
1,064 
I was going through my notes on different finite difference methods and came across something I don't quite...

Feb2612 11:54 AM
O_chemist

0 
1,063 
can any one know how to derive the Lax pair for the cubic nonlinear schrodinger equation?
currently I am interested...

Mar1611 07:23 AM
saravanan13

0 
1,062 
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}

Jan712 05:14 PM
matematikuvol

3 
1,062 
How can we say:
f(x)=A'sin(kx)+B'cos(kx)
or equivalently
f(x)=Ae^{ikx}+Be^{ikx}??
How are these two...

Nov1812 04:44 AM
M. next

6 
1,062 
So this question pertains to some process engineering homework i have, which is basically the following:
I have an...

Feb509 12:09 AM
matematikawan

1 
1,061 
Hi I have been trying to figure out how this method works.
Searched the forum but got no results. Have attached an...

May1510 11:40 AM
LCKurtz

3 
1,061 
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...

Oct1811 06:43 PM
bloodlines

4 
1,061 
Find the Particular Solution. Show the steps of derivation, beginning w/ the general solution....

Nov2310 12:10 PM
Matthew Rodman

1 
1,061 
Hi Mathematicians,
I recently encountered this problem in maximization...
Maximize 1170X1 + 1110X2
Subject to
1. ...

Feb211 07:34 AM
chwala

2 
1,061 
For a general dynamic system: dXi/dt = Fi(X1, X2,...,Xn), i=1,...,n,
Q.1
do you have some ideas of the existence...

Jun2911 01:36 AM
Eynstone

1 
1,061 
Hello,
I am trying to write a program on matlab using ode45 to solve the following equations:
S'=bSZsS...

Aug2611 11:21 PM
klinklindeman

0 
1,061 
Ok, I know how to separate variables in solving an ODE. I am unable to understand a solution I have for a problem...

Jul1312 06:29 PM
ericm1234

2 
1,061 
I am trying to solve an ODE and PDE and I am having problems coming up with a method for doing so.
The PDE is:
...

Jun3013 07:53 AM
dm164

5 
1,060 
Can anyone help me with a simple algorithm or code for a Finite difference Time domain scheme to implement in Matlab....

Jun3008 01:23 PM
chitambira

0 
1,060 
There seems to be something wrong with the LaTeX
This seems like an absolutely trite question, but I can't seem to...

Jun309 06:26 PM
dev00790

1 
1,060 
Hello all,
During the course of a calculation I was doing for my research, I derived a delay integral equation of...

Jul1510 02:58 PM
Mute

2 
1,060 
Hey guys,
I'm sure i'm doing something really daft in not getting this to work, but...
I want to use NDSolve to...

Jul510 02:39 PM
rabbahs

1 
1,059 
I want to solve the boundary value problem:
Laplace's equation for u(r, theta) = 0, 1 < r < 2, 0 < theta < a
...

Apr2211 11:31 AM
Engineer214

2 
1,058 
I would like to ask if anybody knows something about the methods of solving infinite linear autonomous systems of...

Jul3113 12:01 PM
Mandelbroth

3 
1,057 
Hello,
In my Differential Equations class we are learning about modelling with first order differential equations....

Sep2813 02:55 AM
UltrafastPED

3 
1,057 
Hello all,
I was wondering if you could share your thoughts regarding how one should go about solving PDEs in which...

Oct2810 02:20 PM
masnet

0 
1,056 
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...

Oct2910 11:56 AM
Funzies

2 
1,056 