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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 28,467
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
95 131,801
"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 4,461
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 1,618
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
4 926
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 1,585
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 1,368
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 1,933
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
0 780
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
1 942
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 1,039
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
6 881
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 1,088
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 1,422
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 1,771
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 1,098
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 1,287
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
1 810
\underbrace{d}_{dt} (\dot{x})^{2} = 2\ddot{x} ??? or is it just 2\dot{x} ?
Jan19-11 02:20 PM
blueberrypies
5 982
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 3,349
hello, does convergence imply asymptotic relation of an ordinary differential equation?
Jan19-11 07:52 AM
chwala
4 848
http://en.wikipedia.org/wiki/Numerical_ordinary_differential_equations Could someone be nice to explain me the...
Jan18-11 04:17 PM
HallsofIvy
2 1,177
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 1,660
why does the one-dimensional heat equation for temperature distribution contain a second derivative of the spatial...
Jan18-11 02:17 PM
chwala
3 1,260
Asymptotic analysis Hi, can someone please give me a highlight of asymptotic analysis and singular cauchy...
Jan18-11 08:06 AM
chwala
0 986
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 1,259
in attachment you can see the equation
Jan17-11 01:54 AM
JJacquelin
6 1,895
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 1,165
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 1,380
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 2,541
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 1,371
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
0 655
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 3,288
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 1,175
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 1,876
Don't really know how to think about these... (1) Give an example of a 1-dimensional ODE of form x' = f(x), x(0)=x*...
Jan13-11 01:26 PM
HallsofIvy
1 1,200
Hi! My problem is connected with solving 3-dimentional Schrodinger equation for descrete spectrum. I need to...
Jan12-11 08:33 AM
izh-21251
0 1,767
greetings, is it true that a exact differential equation is for two independent variable whereas linear differential...
Jan11-11 04:11 PM
HallsofIvy
3 1,003
ok .lets say the expression we have is ex the taylor expansion becomes 1+x+x2/2+... integrating becomes...
Jan11-11 08:50 AM
quietrain
4 1,706
How can I solve the differential equations system dx/dt = y^2 - x^2 dy/dt = -2xy ? Sorry about not using...
Jan9-11 04:12 AM
JJacquelin
8 1,577
Hello, I have a question on the central difference scheme for differential equations. If we are evaluating at a point...
Jan8-11 07:21 AM
robby991
22 9,583

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