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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
95 138,537
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
1 30,194
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
16 6,136
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
9 16,448
Working through a recent assignment, I've been dealing with an inverse laplace transform \mathcal{L}^{-1}\left that...
Sep6-10 08:53 PM
1 1,521
I'm supposed to use calculus to verify that v(t) = sqrt(gm/cd)tanh((sqrt(gcd/m)t) is a solution to...
Sep7-10 06:04 PM
2 1,111
I am in the prosess of learning FEM but lacking problems to solve to enhance understanding of the subject. If anyone...
Sep6-10 04:57 PM
0 1,106
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
6 1,187
As a freshman in college, I was wondering, is pi's connection with the very simple differential equation...
Sep8-10 08:16 PM
2 1,943
Normal derivative is defined as: \frac{\partial u}{\partial n} = \nabla u \;\cdot\; \hat{n} Where \hat{n} is...
Sep8-10 06:53 PM
3 3,550
Hello, In my work, I have to solve the following integral: \int {exp(-aX^2)I_0(b\sqrt(cX^2+dX+e))}dX where I_0()...
Sep9-10 05:38 PM
6 3,047
Is there a simple way to show that when we differentiate the following expression (call this equation 1): Y(x) =...
Sep10-10 01:44 PM
2 1,011
Hi, Simple question here. What is the difference between \Delta x and dx in differential calculus? Do they both...
Sep25-10 02:18 AM
7 2,078
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
4 3,250
Not sure if this is the right place. Mathematica has a function BesselK that returns the value of the modified Bessel...
Sep12-10 02:50 PM
1 1,189
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
3 1,835
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
1 887
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
2 933
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
2 1,012
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
3 2,280
What is the big advantage of using method of poincare sections and return maps in periodic solutions of differential...
Sep14-10 02:58 AM
0 827
I am trying to find the solution to a problem defined as follows: (\partial_x^2-K^2)^2...
Sep20-10 12:00 PM
6 1,893
Hi, I was solving the following second order ODE: ...
Sep19-10 09:41 AM
5 2,254
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
3 2,941
I have the following exact equations, however, teacher said it is incorrect. Cannot find a mistake. Could you please...
Sep17-10 09:32 AM
2 796
\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
4 2,520
High I am working on the geometrically nonlinear finite element method. I now that in this method, the internal...
Sep19-10 09:06 AM
1 1,158
for \Delta w = \frac{ \partial^{2} w }{x_{1}^{2}} + \frac{ \partial^{2} w }{x_{2}^{2}} and \nabla =...
Sep19-10 03:07 PM
0 1,392
Can you please help me solve the equation of motion for the following diagram Thanks
Sep27-10 07:54 AM
3 3,447
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
2 1,520
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
7 1,649
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
1 860
I've been trying to find the exact solution to the advection equation in spherical coordinates given below ...
Sep23-10 04:08 PM
1 2,918
If we have differential variable of matrix kind ( with dimention 3*3 ) and non matrix ( with dimention 1)...
Sep24-10 03:28 AM
0 1,869
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
19 1,251
Hello everybody, I have been trying to solve coupled two eigenvalue (Sturm-Liouville) problems in terms of two...
Sep27-10 06:48 PM
2 2,529
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
4 1,877
When comparing time and frequency domains, it is easy to imagine the meaning of the Fourier transform. In time...
Sep27-10 04:31 PM
1 2,530
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
1 7,254
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 1,227
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
1 2,787
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
0 1,204

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