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 
121,196 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
25,831 
method of undetermined coefficent is applied when g(x) is exponent, polynomial or trigonometric function. What will...

May1305 08:41 AM
dextercioby

1 
965 
Hi all
I can't figure out how to approach the following difference equation:
ax_{t}+f(x_{t1})+bx_{t2}=e_{t}...

Apr2709 08:09 AM
Busi

0 
965 
Hi everyone.
I'm stuck on a problem, banging of head etc. Basically, I've got a timeevolution problem restricted...

Jul2709 02:06 PM
Mute

3 
965 
For some reason, the syntax is not working and will not print what I am coding so I will just direct you to this link:...

Jun1410 07:41 PM
Void123

2 
965 
one of the questions my diff eq teacher gave us is L{(t^3)(sin^3(t))} (laplace of t cubed sine cubed t)
i'll just...

Apr2410 09:49 PM
elect_eng

1 
963 
Good day forum,
I have this wonderful DE :
dx/dt = x + (b + d(c^t))(x^2)  1
with,
t \in
...

Aug2010 12:10 PM
jackmell

1 
963 
Hi everyone,
I'm trying to solve an exercise in which I need to find x(t) considering that X(ω) = cos(4ω). So, I...

May1612 12:34 AM
helderdias

0 
963 
What is the function corresponding to this ODE:
http://home.arcor.de/luag/math/dgl.jpg
In complex notation it...

Nov1612 02:07 PM
haruspex

3 
963 
I just realized you can use variation of parameters (VOP) to solve for homogeneous 2nd order equations. I see it...

Nov411 03:28 PM
obafgkmrns

1 
962 
So, here's the problem:
\frac{dy}{dx} = \frac{8y}{5x}
To start off, I separate the integrals, which gives me:
...

Oct909 06:55 AM
HallsofIvy

5 
961 
Stuck on a problem that says
So far testing for exact wouldn't work as it wouldn't be exact and I wouldn't be able...

Mar1112 06:59 PM
JJunky3

0 
961 
Find the solution y = φ(t) of the given problem and evaluate φ(t) at t = 0.1, 0.2, 0.3,
and 0.4.
1.y'=3+ty
y =...

Feb2013 08:03 AM
andyk23

2 
961 
solve the initial value problem:
y''+8.4y'+17.64y=e4.2x
y(0)=1, y'(0)=1
y(x)=?
The way I tried to achieve is...

May1109 06:11 PM
whatababy

2 
960 
It is very well known that the result of varying some functional gives a differential equation which solutions...

Feb1311 04:24 PM
Heirot

0 
960 
I've been searching online for the past week but can't seem to find what im looking for.
I need the analytic...

Jul312 12:50 PM
Mute

3 
960 
Hi guys,
Here is an equation that I have tried for few days to solve and still haven't succeeded, I'm interested...

Mar2813 11:55 PM
Simon Bridge

9 
960 
Could someone tell me how to enter the following PDE into convode (or some other pde engine  feel free to solve it...

Apr509 09:33 PM
matematikawan

1 
959 
I have a second order ODE representing a simple massspringdamper system subject to an input force whose time history...

Mar2012 05:00 PM
fjalla

0 
959 
Hi all,
I am Santosh, a grad student at FSU. I am trying to solve a system of 1D pde's using finite difference...

Oct1409 10:54 AM
santhoo24

3 
958 
Hello,
I have a inverse Laplace transform problem: F(s)=1/s^2*exp. I tried some ways but didn't find right answer....

Feb410 07:20 AM
luhug2

0 
958 
I was trying to solve this but to no avail. Then I turned to wolfram alpha for help and there it is:...

Sep1011 08:59 AM
St41n

0 
958 
I'm trying to solve the PDE:
\frac{\partial^2 f(x,t)}{\partial x^2}=\frac{\partial f(x,t)}{\partial t} with x \in ...

Oct1711 09:27 AM
Hootenanny

3 
957 
Hi,
I'm trying to find a differential equation (first OR 2nd order) whose output could be a Fourier Series of a...

Mar2212 11:43 PM
X89codered89X

0 
957 
Hi all! I'm stuck with a system of PDE. I'm not sure I want to write it here in full, so l'll write just one of them....

Jul812 02:08 AM
L0r3n20

4 
956 
given the Laplacian for a certain metric 'g'
\Delta f = \partial _i \partial ^{i}f + (\partial ^{i}f) \partial _ i...

Jun2809 07:53 AM
zetafunction

0 
955 
dy/dt + y =\infty\sumn=1Sin(nt)/n^2

Jun811 02:55 PM
Goklayeh

1 
955 
Assume that f(0) = 0 and Df(0) has eigenvalues with negative real parts. Con
struct a Lyapunov function to show that...

Dec512 06:32 AM
pasmith

2 
955 
He keeps giving us PDEs to solve where the initial conditions specify x at a POINT rather than along a curve e.g....

Dec408 04:25 PM
barnflakes

1 
954 
Is it correct to say that following?
To calculate the distance traveled from the origin after 1 hr when the speed:...

Nov3009 06:47 AM
Hootenanny

1 
954 
Reduce the equation
(equation is attached)
to a set of ODEs by the method of separation of variables.
...

May3010 01:15 PM
sawan.patnaik

2 
954 
How do we/ can we find the solution of a differential eq d^3y/dx^3 + d^2y/dx^2  dy/dx =0?

Oct2110 04:56 PM
g_edgar

2 
954 
I'm given the initial conditions vnot=0m/s, hnot=3000m, and tnot=0s
After 35 seconds of freefall, the chute opens....

Oct1409 08:52 AM
g_edgar

1 
953 
Hi everyone,
Im looking for an autonomous first order ode that has the following properties.
For dependent...

Jan2513 12:38 AM
JJacquelin

7 
953 
hi everybody!
I'm studing the gas diffusion in two cases:
1. first case: gas diffusion in 3D open space in a...

Jan2312 11:40 AM
mike64

0 
952 
I have a question about calculus of variations that is driving me absolutely nuts right now:
I have followed the...

Jul1512 10:28 AM
Marioeden

1 
952 
Why can't homogeneous PDEs be solved by completely fourier transforming both sides, down to an algebraic equation.
...

Apr1009 10:35 AM
Ben Niehoff

3 
951 
We would like to invite anyone with an interest in ordinary differential
equations (ODE) teaching and research to...

Jan3010 07:23 PM
palais

0 
951 
Hello,
Thanks at first. If anyone can understand, then I would like to know how do I get to equation 4.15. Its a...

Nov2610 09:10 AM
hgfalling

3 
951 
I have a doubt in finding out the Particular Integral of eaxV, where 'V' is a function of x.
I saw the book but...

Oct2312 10:51 PM
iVenky

4 
951 
Hi everyone!
I started studying differential equations, but I still didn't understand why the domain of the...

Dec2010 10:25 AM
cathoderay

2 
950 