
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 
136,542 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
29,559 
im looking for an exact analytical solution for the following
(1/alpha) * dT/dt = d2T/dr2 + (1/r)*dT/dr
where d...

Feb810 06:05 AM
gato_

20 
3,975 
hello...
Can anyone tell me how can I simulate the laser rate equation with matlab? i allready wrote a code whics...

Feb310 03:16 PM
katla

21 
17,939 
Let U be an open and bounded subset of \mathbb{R}^n and let v \in \mathcal{C}^2 (U) \cap \mathcal{C} (U) be a solution...

Feb2210 12:54 PM
Kalidor

0 
1,192 
Legendre equation:
(1x^2)y''2xy'+n(n+1)y=0 Where 1< x < 1
General solution is y(x)=c_1 P_n (x)+c_2 Q_n (x)
...

Feb310 11:21 AM
yungman

14 
2,713 
guys please help me, i'm trying to solve a simple moving PDE equation in matlab.
The equation i'm trying to solve is...

Feb1810 09:40 PM
kribosgiros

5 
5,876 
Y=a+b
because Y,aa+Y,bb=0

Feb610 05:52 PM
torquil

1 
1,011 
Can anyone help me to solve the PDE via Inverse Scattering transform method?

Feb410 04:19 PM
kurniliya

1 
1,130 
So I've always done simple ODEs by the method of separation of variables. You know,
dy/dx = A*y
dy/y = A*dx...

Feb210 09:41 PM
LCKurtz

2 
2,408 
I am not interested in the solution, but I am curious what makes: uiv = u, a 4thorder ordinary differential equation....

Feb410 11:50 AM
torquil

8 
1,743 
ive been given this question for a uni assignment:
given the function:
f (x) = 5(x^1.3) +1.5(7x − 3)+ 3(e^− x) +...

Feb810 02:38 PM
alsatron

2 
6,946 
Hello dear friends,
I have this PDE
Can anyone help me in finding what type PDE is it. So that I can try to...

Feb1110 12:44 PM
kosovtsov

7 
1,824 
Hi could someone please explain how this can be done please
1.
The population P satisfies the differential...

Feb410 03:21 AM
elibj123

1 
857 
Hello,
I have a inverse Laplace transform problem: F(s)=1/s^2*exp. I tried some ways but didn't find right answer....

Feb410 07:20 AM
luhug2

0 
987 
I am trying to solve
(1) U_t = 2bU_xy (as part of U_t = aU_xx + 2bU_xy + cU_yy)
using centred finite difference...

Feb1010 11:38 AM
RedBranchKnight

0 
1,012 
I have to set up a differential equation for a leaking cylindrical container that is being refilled at a constant...

Feb710 02:46 PM
torquil

3 
2,150 
Hello everyone and thanks for looking at my thread,
I had some trouble solving this ODE which was in a textbook by...

Feb1010 10:29 AM
IttyBittyBit

2 
894 
My professor yields this equation. d^2z/d0^2+1=0. This problem has to do with heat conduction. So a plane sheet...

Feb1010 02:36 AM
torquil

1 
4,550 
d20/de2+1=0 and the boundry condition is d0/de(evaluated at e=+/ 1)=+/H0(evaluated at +/1). The final result...

Feb810 12:00 AM
juice34

0 
983 
The claim is: Δu≤ sqrt(n)D^2(u)
where we regard Du as a gradient vector and we regard the elements of D^2(u) as...

Feb810 01:14 AM
RAT(16am

0 
1,033 
Hello,
I'm having problems with a D.E. question,
I'm asked to solve the equation:
\left(1+y^{'2}\right)y=k^{2}...

Feb910 03:57 AM
gato_

1 
1,729 
Hello all,
This is to do with forced longitudinal vibration of a rod (bar).
It's basically a problem to do with the...

Feb2010 06:00 AM
ptptaylor

4 
2,319 
What is the meaning of \;\;\frac{\partial u}{\partial t}(x,0)
Is it equal to \;\;\frac{\partial u(x,t)}{\partial...

Feb1110 09:37 AM
Lord Crc

3 
1,328 
In am studying PDE and I have question about D'Alembert solution for one dimension wave equation.
I am going to...

Feb1610 11:47 AM
yungman

7 
3,157 
i need to solve the follow diferential equation:
(\frac{du}{dy})^2=A+Be^{2u}+C \sqrt{D+Ee^{4u}}
where A,B,C,D,E...

Feb1610 09:07 AM
alejandrito29

6 
1,009 
I want to write a program in C that's going to solve 3 second order differential equations, and I have little to no...

Feb1310 02:29 PM
WraithM

4 
2,242 
LaTex Code: \frac{\partial U}{\partial t} + ax\frac{\partial U}{\partial x} + b\frac{\partial^2 U}{\partial x^2} = 0
...

Feb1210 12:17 PM
kosovtsov

1 
1,969 
Can someone solve:
y''(x)  A x^2 y = 0
A = constant
It is probably easy, but I took this class 23 years ago.

Feb2010 09:16 AM
masqau

3 
1,547 
I've come across a very ambiguous statement in my notes on implicit functions (part of the partial derivatives part of...

Feb1310 04:48 PM
raymo39

8 
2,977 
Hi,
I have an excel spreadsheet that calculates the pressure inside a piston chamber, that is a function of time. I...

Feb1510 10:53 AM
a.mlw.walker

7 
1,284 
When you study physics, you never really delve into the reasons behind some of mathematical identities, i was curious...

Feb1410 01:35 PM
elibj123

1 
1,042 
Hi there, could anyone help me on this particularly frustrating problem I am having... I have a linear parabolic...

Feb1610 03:29 AM
nixs

0 
2,023 
Hello Everyone trying to come up with a stratagey to solving this integral
Int(x^3*J3(x),x) no limits
Ive tried...

Feb1610 08:44 PM
Astronuc

2 
1,457 
So the problem is:
x_o=0
\varphi'' + 4\varphi' + \lambda\varphi=0
which satisfies \varphi(0)=3 and \varphi'(0)=1...

Feb1710 05:13 AM
gato_

1 
756 
I have a 3D graphics book, which gives the formula for absorption of radiance along a ray. I am trying to derive the...

Feb1710 08:20 PM
torquil

1 
745 
This is not homework, I need someone to verify (9) and (10) below whether I am correct because I don't have the...

Feb2310 06:58 PM
yungman

10 
2,772 
given a boundary Hermitian eigenvalue problem
L= \frac{d}{dx}\left+q(x)y=\lambda w(x)y
with y=y(x) , in one...

Feb1810 02:31 PM
zetafunction

0 
850 
Stupid thing I noticed today:
\nabla^2 U=tr(H(U))
Or, in other words, the Laplacian of a function is just the...

Feb1910 03:49 PM
Ben Niehoff

5 
1,659 
I am trying to solved a differential equation of Bessel type,
X^2 Y('')+XY(')+(X^2n^2)Y+YlogX=0,
where...

Feb2310 10:00 AM
samreen

12 
3,183 
Hi there!
Few weeks ago I came upon the following problem:
Let B be a vector field derivable from a vector...

Feb2310 01:31 AM
Marin

4 
1,292 
are there numerical mehtods or similar to obtain highly oscillatory solutions ?
i mean, given the solution to a...

Feb2310 03:36 PM
gato_

1 
1,017 