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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 29,554
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
95 136,519
I am trying to solve a problem (not homework, too old for that! lol!) which involves the time dependent schrodinger...
Feb2-11 09:18 AM
timthereaper
1 1,137
Hi Mathematicians, I recently encountered this problem in maximization... Maximize 1170X1 + 1110X2 Subject to 1. ...
Feb2-11 07:34 AM
chwala
2 1,050
The relevant equations: (1) \dot{x} = v(x), x \in U (2) \varphi = x0, t0 \in R x0\in U Let x0 be...
Feb1-11 05:24 PM
Landau
3 1,277
Hi, I am working out a heat transfer problem but i've to solve the Differential equation in order to keep going on...
Feb1-11 12:49 AM
DeltaČ
3 1,285
Hi, I recently need to do some numerical simulation by Euler method to solve a PDE. However, I noticed that there...
Jan31-11 02:32 AM
patrick1990
2 1,505
Hi, In my research on I have a 3rd order ODE where a deferent unknown variable is present . Converting the 3rd order...
Jan30-11 03:20 PM
oby7842
0 1,010
"One morning it began to snow very hard and continued snowing stadily throughout the day. A snowplow set out at...
Jan30-11 10:53 AM
Xyius
8 4,478
That is the title to the problem I am stuck on. Here is what it says.. Consider the equation, \frac{dy}{dx} +...
Jan29-11 11:28 PM
Xyius
0 1,624
dv/dt=g-(k/m)*v^2 i thought about all sorts of diff eq solving techniques but nothing comes up to my mind ...
Jan29-11 02:46 PM
HallsofIvy
4 937
In your own words, what exactly is the purpose of the Existence Uniqueness Theorem and why is it useful :surprised
Jan29-11 02:35 PM
HallsofIvy
2 1,593
My apologies, this isn't appropriate for this part of the forum, I have since moved it to the HW help.
Jan28-11 02:18 PM
ohgeecsea
0 1,371
Hello, i'm trying to proof the partial derivative definition , how do i proof it ?? @f/ @x = lim h-->0 lim /...
Jan28-11 05:29 AM
Jonnyquest
12 1,942
Hi guys! Attached is the differential equation that I want to solve both numerically and analytically, numerically...
Jan27-11 08:22 PM
thavamaran
2 1,114
I already finished a undergraduate ODE course that uses Elementary Differential Equations and Boundary Value Problems...
Jan27-11 12:24 PM
sampahmel
0 790
Hey I was wondering if you'll could help. I was told that this is a simple proof but have been working on it for ages...
Jan26-11 02:43 PM
HallsofIvy
1 944
Hi Everyone, Apologies if this is posted in the wrong place. I am trying to produce numerical solutions for the...
Jan25-11 10:37 AM
rs12345
0 1,045
If I have: \frac{dA(t,z)}{dz} is it possible to convert this to a differential in the form: \frac{dI(t,z)}{dz}...
Jan24-11 04:17 PM
n0_3sc
6 883
QUESTION: Solve the separable differential equation dy/dx = sqrt(4y+64), Initial Condition: y(4)=9, and find the...
Jan23-11 01:17 PM
alchal
2 1,089
Hello All, Given the equation (2/y + y/x)dx + (3y/x + 2)dy I am first asked to show the equation is not exact. To...
Jan22-11 09:38 PM
sleventh
4 1,427
HI, I have solved the diffusion equation using the central difference scheme. Next, I would like to code this...
Jan22-11 09:11 PM
robby991
2 1,777
Hi everyone, I need help with this problem. I just can't get it: Let a,b,c,d,e and f be vectors such that...
Jan22-11 02:26 PM
SammyS
2 1,100
When considering the solution u(x,y) of the poisson equation u_xx + u_yy = -1 for (x,y) in G on a 2-dimensional...
Jan21-11 06:00 PM
Ric72
0 1,291
I'm french and my englis is bad sorry but i need help ! My exam : In this part of the study, we considered the...
Jan21-11 03:05 PM
HallsofIvy
1 811
\underbrace{d}_{dt} (\dot{x})^{2} = 2\ddot{x} ??? or is it just 2\dot{x} ?
Jan19-11 02:20 PM
blueberrypies
5 987
Hi, I try to numerically solve the following partial differential equation for N(r,z) with a Dirichlet boundary...
Jan19-11 08:56 AM
NiclasN
5 3,387
hello, does convergence imply asymptotic relation of an ordinary differential equation?
Jan19-11 07:52 AM
chwala
4 979
http://en.wikipedia.org/wiki/Numerical_ordinary_differential_equations Could someone be nice to explain me the...
Jan18-11 04:17 PM
HallsofIvy
2 1,179
I have come across instances of the phrase "over determination" in discussing Einstein's attempt at a unified field...
Jan18-11 04:00 PM
pellman
2 1,661
why does the one-dimensional heat equation for temperature distribution contain a second derivative of the spatial...
Jan18-11 02:17 PM
chwala
3 1,261
Asymptotic analysis Hi, can someone please give me a highlight of asymptotic analysis and singular cauchy...
Jan18-11 08:06 AM
chwala
0 987
Hi, can someone please give me a highlight of asymptotic analysis and singular cauchy problems....how is asymptotic...
Jan17-11 02:09 PM
chwala
0 1,260
in attachment you can see the equation
Jan17-11 01:54 AM
JJacquelin
6 1,900
Hello I have the following problem: I must show that the Bessel function of order n\in Z J_n(x)=\int_{-\pi}^\pi...
Jan16-11 09:02 PM
ogirald
4 1,167
Hi, I'm new to this forum. It looks like an amazing source of information and people here seem to be helpful and...
Jan16-11 04:16 PM
tiny-tim
9 1,466
I have this problem: Consider the differential equation y'' + P(x) y' + Q(x) y = 0 on the interval a ≤ x...
Jan16-11 02:31 PM
LCKurtz
1 2,546
Hello, before a while I've started studying differential equations in Matlab. I'm solving some problems and I hope...
Jan15-11 01:31 PM
grrrp
0 1,372
Hi guys, I am currently working on a set of non-linear ordinary differential equation which is my laser model....
Jan15-11 12:14 PM
thavamaran
0 658
Hi, have this strange 2nd order ODE in one of my tutorials that I am struggling to start. I am not used to dealing...
Jan14-11 10:36 AM
HallsofIvy
3 3,289
My professor has us using C. Henry Edwards and David E. Penney, Differential Equation and Boundary Value Problems,...
Jan13-11 10:24 PM
mathwonk
1 1,176
If a PDE has no boundary conditions specified, how does one go about providing a solution--even if this is a general...
Jan13-11 01:59 PM
zsua
2 1,885

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