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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
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 30,127
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
95 138,369
I wish to transform my diff. eq. (1/r)*(dy/dr)*(d2/dr2(r*y))*dr into a more convenient expression, in a similar to...
Oct7-12 03:36 AM
Shan K
9 1,789
Dear Friends, I encountered with some difficulties in solving following PDE (off course, analytically not...
Oct6-12 02:42 AM
mohammad449
4 1,569
Hi guys, is there a general method by which to solve a differential equation of form: D(t)=h'(t)(1/h'(t))' +...
Oct5-12 06:49 AM
Aspiring
0 934
Dear All, I am working on electrical modeling which I cannot change divergence to matrix form to solve it with...
Oct4-12 08:47 PM
AGerami
0 971
Hello there, I have read in a paper the following statement, "due to the non-conservtaivness of the system the...
Oct4-12 02:01 PM
muzialis
0 824
If Po dollars are deposited in an account paying r percent compounded continuously and withdrawals are at a rate of...
Oct4-12 11:20 AM
Chestermiller
3 1,129
Hello all~ Given the equation: dy/dx = (x/y) I know we would initially go to: ∫dy =∫ (x/y) dx then too:...
Oct3-12 11:54 AM
Studiot
3 1,193
I've had to take diff eqtns now and I'm trying to get my head around Laplace again.. it's been a while. I can't seem...
Oct2-12 05:55 AM
chief10
24 2,189
HOW IS THE FOLLOWING QUESTION DONE? Milk chocolate is being produced in a 300 litre tank, which initially...
Oct1-12 09:56 PM
nishcha7
3 1,634
now say we have cos^2(3t), how would you go about computing it with the 3t? i can manage cos^2(t) but i'm not sure...
Oct1-12 10:39 AM
chief10
2 1,543
I've tried almost everything but i still get stuck when finding the integral of : (2x^2y-e^(-x^2))dx+(x+1)dy =0 ...
Sep30-12 12:57 AM
JJacquelin
4 1,428
How is this question done?? Milk chocolate is being produced in a 300 litre tank, which initially contains 100...
Sep29-12 10:28 AM
Chestermiller
4 2,096
Hi, I have the equation y' = y^2 + x^2 and am asked to linearise the equation with the appropriate substitution and...
Sep29-12 04:42 AM
JJacquelin
4 1,763
In the course of my research I came across this PDE ...
Sep28-12 09:04 AM
jedishrfu
2 833
My homework is due really soon. Here are all the questions I have absolutely NO idea how to do. 1. Let: f(X) =...
Sep26-12 05:00 PM
HallsofIvy
4 2,832
I'm currently reading a textbook on the application of Lie symmetries to differential equations (Symmetry Methods for...
Sep26-12 11:22 AM
dydxforsn
2 1,228
I saw this post at stackexchange: I ran across this post when trying to solve a homework problem. But I have no...
Sep24-12 03:19 PM
Yondaime5685
2 1,802
hello everyone! I had a stuck in solving problem for a week now, so need help. Please help! the problem is as...
Sep24-12 08:53 AM
voko
3 1,050
Hi, I have the attached diffusion based equations I am looking to solve, however I am unsure about how to implement. ...
Sep24-12 08:31 AM
baseball1234
1 1,212
Im trying to generate turing patterns for brusselator equations, with Octave. It is quite similar to Matlab. I have my...
Sep24-12 02:59 AM
dennisb
0 1,535
Hello, I need to use the Gronwall inequality to discuss existence/uniqueness of the solution to the initial value...
Sep23-12 01:52 PM
JMeyer
0 1,140
Hi: I have come across a PDE of the following form in my research: C_1 \alpha(t,r) + C_2 \partial_t \alpha(t,r)...
Sep22-12 05:25 PM
Norfonz
1 955
My question is in regards to systems of ordinary differential equations. One of my research topics right now involves...
Sep21-12 07:25 PM
Chestermiller
5 1,345
I have a trouble finding a method other than Variation of Parameters to solve y'' + 2xy' + (1+x2)y = 0. Does there...
Sep20-12 03:04 PM
HallsofIvy
1 987
I'm in truble with a partial differential equation. Actually it is a system of PDE but It would be useful to solve at...
Sep20-12 01:34 AM
L0r3n20
6 4,746
I am really confused with the concept of Neumann Boundary conditions. For the simple PDE ut=uxx for the domain...
Sep17-12 05:46 PM
tlonster
0 1,238
I am trying to solve: (x + 1 + f(-x) )(1 - f ' (x) ) = x+1 f(0) = x_0 x in (-1,1) I approximated it...
Sep15-12 11:54 PM
haruspex
5 1,507
I'm inverting this: Y = s2 + 15s + 17 / I'm using PF expansion, A/(s+1) + Bs + C/(s2 + 13s - 4), I however...
Sep14-12 10:48 AM
maistral
1 955
please help by telling me whether my approach to solve the problems are right or wrong. please refer to the ATTACHMENT...
Sep11-12 10:03 PM
chiro
1 1,245
For example, ODE: y'' + y = 0 solve this problem using MAPLE f(x) = _C1*sin(x)+_C2*cos(x) My question is...
Sep11-12 03:42 PM
nufeng
2 1,266
I am having major problems understanding these types of questions, where you will have water and in will be chemicals...
Sep10-12 09:59 PM
Chestermiller
6 1,736
Hi all, I've got a nonlinear differential equation of the general form y' + f(x)y + g(x) = h(x)(y^n) to...
Sep8-12 10:36 AM
bradbrad
2 1,448
Hi all Quick one, if one had an equation y' = x on could simply separate the variables and integrate. Now it the...
Sep7-12 06:07 PM
koab1mjr
2 1,401
hallo I ams earching analytical solution for system of two ODE in next form x*(dy/dr) - (y*y/r) =...
Sep7-12 01:23 AM
trentar
2 1,175
I had kind of a general question. Say I have a second order, homogeneous ODE. Say I use one of the general...
Sep5-12 01:51 PM
dumbQuestion
4 1,265
Hi, i'm writing a pseudospectral code to solve the inviscid burgers' equation with periodic boundary condition....
Sep5-12 10:34 AM
giordi
0 1,372
These DEs are the constraints on the functions C(r,\phi) and B(r,\phi) that zero an acceleration vector. ...
Sep3-12 05:32 PM
Mentz114
0 1,001
Ok I'm supposed to Solve this problem using Laplace Transforms. \frac{d^2 x}{dt^2}+2\frac{dx}{dt}+x = 5e^{-2t} + t...
Sep3-12 02:43 PM
geno678
4 1,404
Hello everyone! I am fairly new to SDE theory, so I'm sorry if my question may be a bit naive. I have the following...
Sep3-12 07:23 AM
sith
1 1,098
I am having confusion, so from what I understand for an exact DE dy/dx = some DE and you can manipulate it so that...
Sep3-12 05:08 AM
Simon Bridge
6 1,275

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