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

Feb2313 09:24 AM
micromass

1 
30,359 
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 
138,887 
Why is there a prize of $1 million for showing that there are smooth solutions to the NavierStokes equations...

Jan2707 01:05 PM
arildno

4 
2,638 
I'm looking at linear, 1st order ODEs, like
y' + p(t)x = q(t)
The notes I'm looking at are calling q(t) the...

Oct410 10:07 AM
jambaugh

2 
1,095 
Hey guys,
Lately I have been focusing on some question that have annoyed me for some time. One of these questions...

Mar2913 07:22 AM
Coelum

6 
1,413 
i'm studying differential equations, the book states the following:
http://i44.tinypic.com/11v4f2u.png
i want to...

Apr312 08:41 AM
cocopops12

2 
1,143 
Hi, I don't understand why the general solution of 2nd order homogeneous equation is linear? Why is...

Oct3111 09:43 AM
lonewolf219

4 
1,650 
Watching this video http://youtu.be/1JnayXHhjlg?t=5m30s, I understood the ideia the fourier transform, that is a...

May1014 05:47 AM
lurflurf

7 
545 
Say you have the diff eq. x'=2x(x13); x(0)=20. After separating and integrating we get,
ln(x13)/x=26t+C
From...

Sep2911 09:31 AM
HallsofIvy

1 
1,282 
whenever i see that integrating factor for solving a linear differential equation with
eint. p(x) dx and then...

Jan3110 10:30 PM
bennyska

2 
1,136 
I'm looking at the BVP:
y'' + ay' + e^{ax}y = 1,
with y(0) = 0 and y(10) = 0.
The numerical solution blows...

Feb909 07:18 PM
rsq_a

3 
1,776 
To solve a separable ODE like this I would simply multiply each side by dx and then integrate both sides. However, I...

Jul309 11:43 AM
AiRAVATA

13 
5,243 
Let g(x) be the right side of a heterogeneous ODE. Why do we take the derivative of g(x) when using the method of...

Sep1513 05:55 AM
CAF123

5 
1,292 
We were trying to solve the problem 28.32 on page 289 of the Schaum's Series Differential Equations by Richard Bronson...

Apr408 03:35 AM
matematikawan

0 
1,127 
I'm solving the following equation in the unit square using finite differences:
epsilon(u_xx+u_yy)+u_x+u_y=0, where...

Jun106 07:36 AM
DeeCeeBee

0 
1,767 
let f(x,y)=0
Why df=(∂f/∂x)dx + (∂f/∂y)dy?

Oct1611 10:09 PM
Bacle2

6 
4,448 
I am currently studying a great text
Elementary Differential Equations and Boundary Valued Problems 9th edition;...

Sep409 06:48 AM
HallsofIvy

1 
1,572 
I was wondering why. When we differentiate, don't we result in an equation that describes the slopes of many other...

Jun2111 09:29 AM
physixer

3 
2,271 
After a short look on the question formulated in this differential equation forum I came to the conclusion that the...

Oct2412 08:03 PM
Unstable

8 
1,629 
Hi,
I'm an engineer who uses a lot of finiteelement software for doing multiphyics modeling. I've been learning a...

Sep914 07:11 AM
NumericalFEA

10 
577 
Hi,
I hope I posted in the right group. I read some papers about infinite dimensional systems and gave PDEs as...

Mar1111 02:56 AM
zhidayat

4 
2,566 
Given a implicit ODE like F(x, y(x), y'(x), y''(x)) = 0, why your explicit form is y''(x) = f(x, y(x), y'(x))? Why a...

Mar2714 12:36 PM
micromass

4 
443 
(\frac{\partial z}{\partial x})y
the small y, what does it mean.
the context this is used in is F(x,y,z) where...

Apr1212 06:36 AM
D H

1 
1,189 
Dear Sir/Madam,
Who knows the original publication of Laplace transformation by Laplace? Which journal and what...

Feb2411 01:15 PM
SteamKing

1 
1,003 
Looking for the solution to the following ODE:
\

Aug1409 02:01 PM
coomast

3 
1,126 
For a falling object, who can find the time in terms of the velocity for this journey( before reaching terminal...

Nov2609 08:15 PM
HallsofIvy

4 
965 
Hello guys, i'm new here. i was working on a mathematical methods in physics book and there is a part that i dont...

Dec2009 04:05 AM
mertymertcan

0 
2,889 
I simply can't recognize it
y' = \frac{1}{3}y^{\frac{1}{2}} + t^{\frac{1}{3}}
Which type of differential...

Sep2410 07:41 AM
jackmell

7 
1,663 
http://i.imgur.com/64ADMbk.png
Are they both correct? Would the first or second solution be preferred?

Oct413 08:27 AM
HallsofIvy

7 
4,604 
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 
1,074 
Hi, I have the attached diffusion based equations I am looking to solve, however I am unsure about how to implement. ...

Sep2412 08:31 AM
baseball1234

1 
1,223 
ex2=t1ex2\frac{1}{tx}\frac{dt}{dx}
Which method should be used and how can you tell just by looking at it?

Jan2813 12:34 PM
Mark44

2 
629 
I'm new to DEs, and can do most I've come across so far, but this has me stumped:
...

May1104 01:04 PM
arildno

1 
1,570 
Hello
everything follows up well, but when I compare the result (eq. 5) with the numerical solution of eq. 1, then...

May1311 12:30 PM
JJacquelin

1 
1,065 
Folks,
To date I have been reading about Euler Bernoulli Beam and Timoshenko Beam Theory desribed by the following...

Dec1012 01:35 PM
bugatti79

3 
962 
I took an introduction to ODEs course this past spring semester. It always bothered me where this thing came from. I...

Sep1014 05:52 PM
priti2014

13 
401 
I need a physical explaination of s domain..Is sdomain a higher dimensional plane..?

Jun1512 08:23 AM
Vargo

8 
3,195 
A simple question.
Suppose I have \epsilon^2 y'''  y' = \frac{1}{1+x^2}.
The goal is to calculate the fourier...

Aug1708 08:08 AM
rsq_a

1 
1,554 
There are a few theorems in my DE book whose proofs I've been trying to find, without much luck:
1) Given an nth...

Mar2113 12:22 AM
slider142

4 
847 
Hello. Where can I find proofs for the solution of d. equations? I can find the solutions but I cannot find the...

Mar3111 12:48 PM
mike_

7 
1,195 
I'm having a lot of trouble with the basics in DE, I was wondering if anyone knows of a good tutorial site, or a site...

Jan607 07:52 PM
Dr Game

0 
1,713 
where can i find a good animation lecture
which explains this stuff step by step
so i could solve the kinds of...

May1208 01:45 PM
transgalactic

2 
1,163 