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

Feb2313 09:24 AM
micromass

1 
29,614 
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 
136,718 
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 
1,272 
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 
1,782 
I've started reading Gerald Teschl's Ordinary Differential Equations and Dynamical Systems. I'd desperately like to...

Apr2111 06:36 AM
Rasalhague

0 
1,183 
y' = \frac{1}{t^{2}} \frac{y}{t}  y^{2}

Apr2111 06:15 AM
kenano

0 
508 
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 
716 
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 
11,903 
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 
1,390 
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 
792 
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 
661 
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 
2,416 
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 
817 
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 
5,519 
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 
3,412 
Hey,
I want to solve a parabolic PDE with boundry conditions by using FINITE DIFFERENCE METHOD in fortran....

Apr1911 10:52 AM
yus310

1 
3,100 
Hello.
If I have this equation:
http://i52.tinypic.com/2jb4b43.png
And this general solution:
...

Apr1911 10:47 AM
yus310

2 
1,808 
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 
1,046 
My text gives the following definition for the solution of the heat equation with initial temperature distribution f...

Apr1811 11:56 PM
erok81

0 
1,555 
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 
1,221 
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 
1,239 
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 
3,215 
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 
1,817 
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 
936 
Hello everyone,
I am trying to find good references or information on developing the variational formulation for...

Apr1511 07:47 AM
Shaovus

0 
844 
What is the corresponding discrete version to the first, second, and higher order derivatives of function?

Apr1511 07:34 AM
Filip Larsen

1 
718 
Are there any exact solutions for twodimensional projections of 3body problems?

Apr1411 07:14 PM
LCKurtz

1 
626 
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 
792 
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 
4,322 
I'm working on a project where I'm trying to find the differential equation of a falling raindrop. The drop I'm...

Apr1411 08:51 AM
gato_

3 
2,711 
Hi there,
I am starting with the Bessel functions and have some problems with it. I am getting stuck with this...

Apr1211 07:55 PM
victor_santos

5 
6,460 
No more help needed. Sorry I don't know how to delete this now.

Apr1111 08:59 PM
richme

0 
1,101 
Hello,
Could anyone explain me or send a link where i can learn how to solve numerically this set of...

Apr1111 06:22 AM
Guimuma

0 
1,918 
I am trying to understand cosmological expansion and how it is possible to see objects that are receding from us...

Apr1111 01:26 AM
JJacquelin

9 
2,050 
Is it necessary that force term in anharmonic oscillator should contain only third power in dependent variable(say x)?...

Apr1011 07:54 PM
Prologue

1 
1,721 
Hi everyone,
I just have a question, Could someone please outline the steps to differential equations class from AP...

Apr1011 12:12 PM
dww

6 
4,943 
can you help me to check the answer ?pls give some suggestion ......i think someway is wrong...

Apr1011 10:43 AM
kingboy

5 
994 
In Von Neumann stability analysis, what is the reason behind assuming the error El,j = zjeiblh, for b being a real...

Apr1011 08:10 AM
NikSDel

0 
1,043 
In the xy plane, we have the equation
\nabla^{2} \Psi =  4\pi \delta(x x_{0}) \delta (y y_{0})
...

Apr1011 04:25 AM
plasmoid

0 
1,476 
Hi, All:
I am taking a financial maths course and I encounter the following ODE:
dy/dx = x+ x^2*y+x^3*y^2
...

Apr1011 03:37 AM
JJacquelin

4 
1,122 
This might sound kinda dumb, but what is the Inverse Laplace transform of a number?
So L^{1}(8) for example.

Apr1011 03:21 AM
JJacquelin

3 
1,258 
Need some help figuring this out...
Juliets love for Romeo cools in proportion to his love for her. Romeo's love...

Apr911 09:05 AM
tinytim

5 
1,936 