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Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
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Jan16-12 Greg Bernhardt
My intent is to create a thread for people interested in Differential Equations. However, I will explicitly state that...
Jul3-12 07:18 PM
Luccas
95 138,276
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
micromass
1 30,075
Well, i realy i am pissed at the moment because of this. I have been trying to figure out if there is a...
Sep24-10 02:27 AM
notpigfly
16 6,109
How do I reduce an equation to Bessel's equation and find a general solution to it: For example how do I solve...
Sep23-10 10:27 PM
abhishekgoyal
9 16,403
I am a freshman in college and I am in multivariable calculus, I took the first AP calc in highschool. I am deciding...
Sep14-10 12:51 AM
n1person
6 1,183
Hi, Simple question here. What is the difference between \Delta x and dx in differential calculus? Do they both...
Sep25-10 02:18 AM
mechprog
7 2,069
Hello all! :smile: I through a section in my text (by Greenburg) on 1st Order linear ODEs. I am understanding the...
Sep15-10 08:12 PM
klondike
4 3,232
A person who weighs 200 lbs is falling through the sky while attached to a parachute. The equation of the downward...
Sep17-10 09:44 AM
HallsofIvy
3 1,833
Hey everyone. I've got through most of a problem that involves finding an inverse laplace transform, but I am...
Sep12-10 11:12 PM
n.karthick
1 882
If my Force = (-gamma)(dx/dt) velocity v = dx/dt Mass m (m)(dv/dt) = F = (-gamma)(dx/dt) Now I want to...
Sep19-10 09:40 AM
astonmartin
2 931
Hey. I am having a hard time solving this problem. (x^2)y' + 2xy = 5y^4 I get as far as simplifying to y' = ...
Sep15-10 04:36 AM
LawlQuals
2 1,011
Hello, I am facing a diffusion equation.. \frac{du(x,t)}{dt} = D \frac{d^2u}{dx^2} .. with slightly exotic...
Sep18-10 01:28 PM
Thaakisfox
3 2,272
What is the big advantage of using method of poincare sections and return maps in periodic solutions of differential...
Sep14-10 02:58 AM
ajaleelp
0 821
I am trying to find the solution to a problem defined as follows: (\partial_x^2-K^2)^2...
Sep20-10 12:00 PM
klondike
6 1,885
Hi, I was solving the following second order ODE: ...
Sep19-10 09:41 AM
jaseh86
5 2,245
I need to solve d/dx(e^(-(x^2))*(du/dx))=u+x*(du/dx) I get e^(-(x^2))*u''-2xe^(-(x^2))*u'=u+x*u'...
Sep17-10 02:58 AM
jackmell
3 2,932
I have the following exact equations, however, teacher said it is incorrect. Cannot find a mistake. Could you please...
Sep17-10 09:32 AM
HallsofIvy
2 795
\Delta\psi(\vec{r},t)-\frac{1}{\upsilon^2}\frac{\partial^2\psi(\vec{r},t)}{\partial t^2}=-g(\vec{r},t) How to get...
Sep19-10 09:28 AM
arkajad
4 2,513
High I am working on the geometrically nonlinear finite element method. I now that in this method, the internal...
Sep19-10 09:06 AM
HallsofIvy
1 1,157
for \Delta w = \frac{ \partial^{2} w }{x_{1}^{2}} + \frac{ \partial^{2} w }{x_{2}^{2}} and \nabla =...
Sep19-10 03:07 PM
Somefantastik
0 1,387
Can you please help me solve the equation of motion for the following diagram Thanks
Sep27-10 07:54 AM
ManuelF
3 3,439
Hello! I would like to show the following: u\in C^2(U) \cap C(\bar{U}) satisfies \Delta u(x)>0 for any x\in U, then...
Sep25-10 02:00 PM
loesung
2 1,516
I simply can't recognize it y' = \frac{1}{3}y^{\frac{1}{2}} + t^{\frac{1}{3}} Which type of differential...
Sep24-10 07:41 AM
jackmell
7 1,642
Hi guys, Can someone please explain how you find the eigenvalues of this type? u''+\lambda u =0 or point me...
Sep23-10 04:27 AM
Pythagorean
1 858
I've been trying to find the exact solution to the advection equation in spherical coordinates given below ...
Sep23-10 04:08 PM
jackmell
1 2,905
If we have differential variable of matrix kind ( with dimention 3*3 ) and non matrix ( with dimention 1)...
Sep24-10 03:28 AM
madjid222
0 1,866
hi frinds im new to this forum pls guide me if im wrong at any place im very much confused abt finding the degree...
Sep26-10 01:51 AM
cindrilla
19 1,248
Hello everybody, I have been trying to solve coupled two eigenvalue (Sturm-Liouville) problems in terms of two...
Sep27-10 06:48 PM
Urkel
2 2,521
Hello! I am trying to solve... u*ux + uy -u = 0 with i.c. u(x,0) = x +10 Determine: a.) characteristic...
Sep26-10 10:19 AM
ZachN
4 1,867
When comparing time and frequency domains, it is easy to imagine the meaning of the Fourier transform. In time...
Sep27-10 04:31 PM
psmitty
1 2,524
Hello, I joined a class on Partial Differential Equations 3 or 4 lectures late, so I have missed the classes...
Sep27-10 11:03 PM
Eynstone
1 7,212
Hello, I just wanted to know how we moved from the first to the second equation,namely the (-) sign. ...
Sep29-10 04:45 AM
electronic engineer
0 1,225
So i have an organic chemical in a bio-film reactor being diffused into a bio-film and also being metabolized at...
Oct2-10 12:43 AM
Eynstone
1 2,780
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...
Oct4-10 10:07 AM
jambaugh
2 1,091
I had posted a thread on another forum about building a 100GHz oscilloscope which resulted in the signal being chopped...
Oct1-10 07:51 PM
rebeka
0 1,201
Here is an image of the first order linear differential equation and my attempt to solve it. It ends in an integral...
Oct3-10 03:05 AM
JJacquelin
4 2,570
I'm trying to follow a proof for the solution of the diffusion equation in 0 < x < l with inhomogeneous boundary...
Oct3-10 03:30 PM
jackmell
1 1,097
Shall f be continous function of two real variables. Proof that if equation x''=f(x,x') has not constant solutions,...
Oct4-10 06:23 AM
Eynstone
1 942
a\text{''}+B*a'-A*a==0 a = 10^-9 a' = 0 a = ? The coefficients A and B are variable over time. I HAVE solved...
Oct4-10 12:37 AM
Simon_Tyler
1 1,549
Hi! I am trying to understand the MP for the heat eqn. in \mathbb{R}^n (see attached jpegs below). I don't understand...
Oct3-10 11:17 PM
loesung
0 710
I am new to differential equations, any help would be great. I have a ODE of the second order u''x = e^x over the...
Oct4-10 02:22 PM
dinaharchery
1 1,006
Can anyone help me find the bifurcation value of dy/dt = y^3 + ay^2 where a is the parameter. I found that the...
Oct5-10 08:05 AM
jackmell
1 1,302

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