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

Feb2313 09:24 AM
micromass

1 
30,072 
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 
138,273 
See attached image for the question and my working. Hopefully you can read it OK, I had to resize it to fit to the...

Apr2511 01:43 AM
joriarty

6 
1,422 
Hello,
I managed to solve the differential equation : dx/dt= 0.1 (x250)
with the information when t=0 x=1000...

Apr2411 07:24 PM
HallsofIvy

2 
930 
\acute{y} = \frac{1}{t^{2}} \frac{y}{t}  y^{2}
To solve a Riccati type diff eq a particular solution is needed....

Apr2411 04:00 AM
JJacquelin

5 
994 
I'm a theoretical biologist in the process of developing a spatial model for animal movement. So far, I've arrived at...

Apr2411 03:40 AM
JJacquelin

3 
1,080 
So I just recently learned about how to use Greens Function to solve a differential equation. The formula was derived...

Apr2311 03:40 PM
Xyius

4 
2,126 
Dear friends
I am investigating the Painleve analysis for some complex nonlinear evolution equations?
What is the...

Apr2311 01:51 AM
saravanan13

0 
677 
Today I was doing a problem (physics) and ended up with the a differential equation dT = µ T sin(dθ) (Where µ is...

Apr2211 04:20 PM
hotvette

1 
1,605 
So I type a differential equation into Wolfram Alpha, like so:
...

Apr2211 03:45 PM
I like Serena

2 
1,335 
Hello everybody! I have a really silly question concerning wave equation: consider the problem
\left\{...

Apr2211 01:27 PM
LCKurtz

1 
787 
\frac{d\mu }{dt}=\left( kx\right) \left( \frac{\mu _{m}^{3}\mu ^{2}\mu
_{m}}{\mu ^{2}+\mu _{m}^{2}2\mu \mu...

Apr2211 11:59 AM
JJacquelin

1 
845 
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 
Okay, good, so y' = 3y is an autonomous ODE, while y'(t) = 3y(t) is not autonomous??
Seems like a contradiction...

Apr2211 06:16 AM
Rasalhague

4 
1,120 
i don't really understand the difference :(
∇2V versus ∇ (∇ . V) ???
can anyone give me a simple example to...

Apr2211 12:01 AM
quietrain

10 
8,957 
Equations:
(d^2r/dt^2)  r*(dθ/dt)^2 = 10/(r^2)
and
r^2*(dθ/dt)=1
How would I get three 1st order ODE's...

Apr2111 01:07 PM
JJacquelin

4 
1,277 
I've been given a function U(x,y) where f(z) = U(x,y) + iV(x,y)
and asked to check if it is harmonic and then work...

Apr2111 11:27 AM
anirudh dutta

4 
1,790 
I've started reading Gerald Teschl's Ordinary Differential Equations and Dynamical Systems. I'd desperately like to...

Apr2111 06:36 AM
Rasalhague

0 
1,190 
y' = \frac{1}{t^{2}} \frac{y}{t}  y^{2}

Apr2111 06:15 AM
kenano

0 
510 
What is the difference in expanding a solution of a complex differential equation in terms of Laurent and Taylor...

Apr2111 04:16 AM
JJacquelin

1 
723 
consider and determine the steady state solution of the differential equation below.
dy/dx = y(y1)(y+1)
We can...

Apr2011 05:47 PM
epenguin

6 
12,005 
1. The problem statement, all variables and given/known data
Hello I am trying to solve the following Differential...

Apr2011 03:25 PM
JJacquelin

2 
1,399 
I am trying to solve the following PDE:
\frac{\partial f(x,t)}{\partial t}=a(x,t)\frac{\partial^2...

Apr2011 02:58 PM
jmk9

0 
805 
What is the difference between simple fixed pole and simple movable pole?
Differential eqs. z(dw/dz)+w=0,...

Apr2011 08:03 AM
JJacquelin

1 
676 
I wrote a program that uses the FEM to approximate a solution to the heat conduction equation. I was lazy and wanted...

Apr1911 11:25 PM
BGalerkin

0 
2,433 
In a past exam paper at my uni I am asked to show that the hermite polynomials are solutions of the hermite diff....

Apr1911 06:39 PM
Zorba

1 
826 
I just started learning about DE's and am impressed by how much information they contain. Are they usually just a...

Apr1911 02:31 PM
DrummingAtom

4 
5,546 
Hi, I am looking to model the diffusion of a particle through 2 layers using the finite difference method in matlab. ...

Apr1911 12:13 PM
robby991

25 
3,448 
Hey,
I want to solve a parabolic PDE with boundry conditions by using FINITE DIFFERENCE METHOD in fortran....

Apr1911 10:52 AM
yus310

1 
3,120 
Hello.
If I have this equation:
http://i52.tinypic.com/2jb4b43.png
And this general solution:
...

Apr1911 10:47 AM
yus310

2 
1,821 
I've taken a first semester course on PDEs. Basically all we learned was separation of variables and method of...

Apr1911 07:04 AM
AlephZero

1 
1,056 
My text gives the following definition for the solution of the heat equation with initial temperature distribution f...

Apr1811 11:56 PM
erok81

0 
1,569 
Hi, I developed Matlab code to solve the diffusion equation using the central difference equation, with an added term...

Apr1811 09:16 PM
robby991

3 
1,229 
Here is the question. Find the steady state solution of the differential equation below.
dy/dx = tan(x^2)
What...

Apr1811 08:59 PM
HallsofIvy

1 
1,248 
Hello, first time poster.
I am putting this question in the PDE section because this was a question I came up while...

Apr1811 06:57 PM
HallsofIvy

3 
3,252 
I am looking at the derivation for the solution to solve the partial differential equation of a wave with a...

Apr1611 11:58 PM
Xyius

2 
1,834 
Given a set of vectors {v_ j } = {v_1, ..... v_N} and I wish to transform each vector in the following manner
v_ i...

Apr1511 06:56 PM
dan7

1 
940 
Hello everyone,
I am trying to find good references or information on developing the variational formulation for...

Apr1511 07:47 AM
Shaovus

0 
847 
What is the corresponding discrete version to the first, second, and higher order derivatives of function?

Apr1511 07:34 AM
Filip Larsen

1 
723 
Are there any exact solutions for twodimensional projections of 3body problems?

Apr1411 07:14 PM
LCKurtz

1 
630 
ty''(t+1)y'+y=t^2
I know I have to use variation of parameters to solve this.
But I am stuck and cannot figure...

Apr1411 03:26 PM
LCKurtz

2 
815 
I am looking into Fourier series expansion of function that is non periodic on 0< x< p. This is under the tittle of...

Apr1411 03:10 PM
LCKurtz

6 
4,351 