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 
121,284 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
25,870 
Hello, I was wondering if anyone could shed some light upon solving this:
s(x)'' = (a b s(x)) / s(x)^3
Where...

Mar2310 03:54 PM
ayae

4 
1,312 
Hi all, I'm writing myself a ordinary differential equation solver and I've already implemented several explicit...

Mar2310 11:11 PM
matematikawan

5 
4,231 
Hi there,
Many of the problems on this part of the forum simply boil down to "I don't know how to solve the ODE:...

Mar2310 11:26 PM
matematikawan

3 
1,253 
I want to solve:
y(x)''(\frac{m\pi}{a})^2y(x)=0
With boundary condition y(0)=y(a)=0.
First part is very easy...

Apr510 12:25 AM
yungman

15 
3,597 
Conventional solution of \nambla^2u(x,y)=f(x,y) involve solution u(x,y)= \sum_{n=1}^{\infty} \sum_{m=1}^{\infty}E_{mn}...

Apr710 01:46 AM
yungman

6 
1,948 
I have a question on the integration part of the Variation of Parameters. Given .y''+P(x)y'+Q(x)y=f(x)
The...

Mar2310 11:31 PM
matematikawan

3 
1,123 
I was thinking about the nonlinear NavierStokes equation this morning and was briefly browsing a text on the...

Mar2410 08:53 AM
linford86

4 
1,050 
Investigate uniqueness of the differential equation
the question is in the image attached

Mar2010 07:48 AM
ahmed39399

2 
976 
Hey, I'd really appreciate if you could read the following transcription from my textbook and let me know what exactly...

Mar2010 03:32 PM
tinytim

1 
1,786 
Hello,
Can someone explain / show me how equations (15) and (16) are derived from equation (14) in this modified...

Mar2010 09:27 PM
confi999

0 
1,693 
as a student in physics, i cannot see the usefulness of green function
to me, the definition of a green function...

Mar2210 12:41 AM
wdlang

2 
1,558 
Hi everyone:
I am teaching myself transport/programming, and have created a simple program for 1D...

Mar2310 11:37 PM
clustro

1 
3,230 
Hey,
I am wondering how to solve this heat equation with a 'generation' term included. In one instance I am adding...

Mar2310 11:35 PM
clustro

3 
1,341 
Hallo,
does anybody know the analytical solution or approx of analytical solution for:
wxx+wyy=f(x)
where...

Mar2310 06:58 AM
jangolobow

0 
802 
Maybe I'm just dumb...
y'(t)=y(t)^3+f(t)
find y(t)
Thanks...

Apr710 02:38 AM
Eynstone

1 
1,139 
I've been trying (unsuccessfully!) to rearrange the following equation so that H is the subject:
mgH = / 2
...

Mar2410 10:24 PM
hotvette

1 
1,023 
hi, I'm working on Tm3+ fiber laser rate equation modeling using Mathematica.
The rate equations I'm using for the...

Mar2510 02:12 AM
test1234

0 
2,519 
I was wondering if the Laplace transform can be applied to solve certain systems of differential equations with...

Mar2510 05:22 AM
bitrex

0 
3,729 
I m currently dealing with numerical modelling of DFB laser and i m going to use the method Transfer Matrix...

Mar2510 06:32 AM
pinkpinkgal

0 
1,717 
Hi all,
I'm a final year acoustics student in the UK attempting to model the modal response of a circular plate as...

Mar2510 02:50 PM
trimboone

0 
1,101 
Suppose that a tank containing a certain liquid has an outlet near the bottom. Let be the height of the liquid...

Mar3010 11:23 PM
Eynstone

1 
8,394 
http://books.google.ca/books?id=Pd8s6rOt_cC&pg=PA70&lpg=PA70&dq=%22show+that+in+a+hamiltonian+system+it+is+impossible+...

Apr910 06:42 AM
Eynstone

1 
975 
Hallo,
does there exist analytical solution or approximation to poisson equation pde in 2 dimensions
...

Mar2810 10:34 AM
jangolobow

0 
1,090 
Hi all can anyone help me to reduce following diff.Equ. to bessel eq.
4x^3*y''y=0
thanks in advance .
I am...

Mar2910 01:42 PM
g_edgar

1 
1,232 
So there's this ODE:
yy''(y')2 = y3
After doing some work it gets to this point:
(y')2=2y3
Taking the root:
y' =...

Apr210 06:45 AM
manenbu

12 
1,088 
Dear all,
I'm trying to solve the 2d heat equation in a radially symmetric domain, numerically using the...

Mar2910 08:51 AM
ndalchau

0 
1,486 
Hi everyone,
I'm having a hard time analyzing the following problem:
b v(x) = exp(x)  1/2 ( g v'(x) )^2...

Mar2910 09:42 AM
DanS

0 
850 
Consider a heat equation for the temperature u of a rod of length 1:
ut = uxx, 0 < x < 1, t > 0 with boundary...

Apr110 01:04 PM
LCKurtz

1 
731 
I have two PDE's. One in terms of dz and the other in terms of dt:
\frac{dI(t,z)}{dz}=aI(t,z) + bI^2(t,z) ...

Apr310 04:53 PM
n0_3sc

6 
1,426 
I have been playing around with the Matlab quiver plot, and I found something strange: it seems that the gradient...

Apr110 07:01 AM
zslevi

1 
7,126 
Hello ppl
I stuck with a differential equation and all I need is your kind help. While solving a problem I got one...

Apr210 11:39 AM
vinodjoshi

7 
938 
Abramovitz presents even and odd solutions to the Weber equation.
He also presents standard solutions as a pair of...

Apr410 07:48 PM
intervoxel

2 
2,906 
im having problem integrating the equation
dydx=y^2/x^2
and also
dydx=3*y^2/x

Apr910 07:14 AM
StalkerM

2 
2,123 
Hi all, I came across an equation in this form while trying to understand a paper:
f(t+T)  f(t) = \int_t^\(t+T\...

Apr510 08:30 AM
g_edgar

1 
881 
Hi,
I have been trying to solve this differential equation for a while now. Now I get to the point where I have the...

Apr610 11:20 AM
renz

2 
1,096 
I have some confusion about when separation variables can be applied to a PDE. Can it be applied on any PDE that can...

Apr610 10:15 PM
hosun

1 
685 
How to state the equations of a rational functions with the following asymptotes?
(1)x=2, y=3
(2)y=0, x=4
...

Apr710 02:05 AM
Eynstone

1 
1,929 
How to define neumann boundary in matlab programme for a poisson equation on a 2D plate? Thanks!

Apr710 03:04 PM
memeplus

0 
2,571 
Could someone explain why the graph of a solution can never cross a critical point?

Apr910 02:42 AM
jrlaguna

1 
643 
Where do textbook authors get the formula for the position function or the function of a moving particle that are used...

Apr910 09:54 AM
MustangGT

3 
663 