
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 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...

Jul312 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...

Jan3011 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} +...

Jan2911 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
...

Jan2911 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

Jan2911 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.

Jan2811 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 /...

Jan2811 05:29 AM
Jonnyquest

12 
1,933 
Hi guys! Attached is the differential equation that I want to solve both numerically and analytically, numerically...

Jan2711 08:22 PM
thavamaran

2 
1,114 
I already finished a undergraduate ODE course that uses Elementary Differential Equations and Boundary Value Problems...

Jan2711 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...

Jan2611 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...

Jan2511 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}...

Jan2411 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...

Jan2311 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...

Jan2211 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...

Jan2211 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...

Jan2211 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 2dimensional...

Jan2111 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...

Jan2111 03:05 PM
HallsofIvy

1 
810 
\underbrace{d}_{dt} (\dot{x})^{2} = 2\ddot{x} ??? or is it just 2\dot{x} ?

Jan1911 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...

Jan1911 08:56 AM
NiclasN

5 
3,349 
hello,
does convergence imply asymptotic relation of an ordinary differential equation?

Jan1911 07:52 AM
chwala

4 
848 
http://en.wikipedia.org/wiki/Numerical_ordinary_differential_equations
Could someone be nice to explain me the...

Jan1811 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...

Jan1811 04:00 PM
pellman

2 
1,660 
why does the onedimensional heat equation for temperature distribution contain a second derivative of the spatial...

Jan1811 02:17 PM
chwala

3 
1,260 
Asymptotic analysis
Hi,
can someone please give me a highlight of asymptotic analysis and singular cauchy...

Jan1811 08:06 AM
chwala

0 
986 
Hi,
can someone please give me a highlight of asymptotic analysis and singular cauchy problems....how is asymptotic...

Jan1711 02:09 PM
chwala

0 
1,259 
in attachment you can see the equation

Jan1711 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...

Jan1611 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...

Jan1611 04:16 PM
tinytim

9 
1,380 
I have this problem:
Consider the differential equation
y'' + P(x) y' + Q(x) y = 0
on the interval a ≤ x...

Jan1611 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...

Jan1511 01:31 PM
grrrp

0 
1,371 
Hi guys, I am currently working on a set of nonlinear ordinary differential equation which is my laser model....

Jan1511 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...

Jan1411 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,...

Jan1311 10:24 PM
mathwonk

1 
1,175 
If a PDE has no boundary conditions specified, how does one go about providing a solutioneven if this is a general...

Jan1311 01:59 PM
zsua

2 
1,876 
Don't really know how to think about these...
(1) Give an example of a 1dimensional ODE of form x' = f(x), x(0)=x*...

Jan1311 01:26 PM
HallsofIvy

1 
1,200 
Hi!
My problem is connected with solving 3dimentional Schrodinger equation for descrete spectrum.
I need to...

Jan1211 08:33 AM
izh21251

0 
1,767 
greetings,
is it true that a exact differential equation is for two independent variable whereas linear differential...

Jan1111 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...

Jan1111 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...

Jan911 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...

Jan811 07:21 AM
robby991

22 
9,583 