
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 
139,030 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
30,398 
Hi,
could someone please link me to the relevant theorems etc (or explain personally) that answer the issue that...

Apr411 07:15 PM
Ben Niehoff

1 
1,086 
I'm a theoretical biologist in the process of developing a spatial model for animal movement. So far, I've arrived at...

Apr2411 03:40 AM
JJacquelin

3 
1,086 
I'm trying to solve the heat conduction formula in 3 dimensions when there is constant generation from electrical...

Feb113 01:03 PM
pasmith

2 
1,086 
I've been trying (unsuccessfully!) to rearrange the following equation so that H is the subject:
mgH = / 2
...

Mar2410 10:24 PM
hotvette

1 
1,085 
Ok, I know how to separate variables in solving an ODE. I am unable to understand a solution I have for a problem...

Jul1312 06:29 PM
ericm1234

2 
1,085 
How can we say:
f(x)=A'sin(kx)+B'cos(kx)
or equivalently
f(x)=Ae^{ikx}+Be^{ikx}??
How are these two...

Nov1812 04:44 AM
M. next

6 
1,085 
I would like to ask if anybody knows something about the methods of solving infinite linear autonomous systems of...

Jul3113 12:01 PM
Mandelbroth

3 
1,085 
I'm having trouble understanding the concept of laplace transformations.
my book states that it is comparing how...

Apr2605 09:04 PM
Corneo

1 
1,084 
What method can I use to analytically solve the following 2nd order PDE?
u=u(x,t)
∂u/∂t  a*x*∂u/∂xD*∂^{2}u/∂t^{2}...

Oct3011 03:05 AM
pangyatou

1 
1,084 
Hello
I have no experience in solving such equations, the equation in question is
\frac{dv}{dt}=\alpha v +...

Oct3011 11:30 AM
johnt447

0 
1,084 
is this the wriye formula of cofficient of friction
22/7 x D x n/12

May1609 06:40 AM
HallsofIvy

2 
1,083 
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 
1,083 
Hello
Don't think this is homework, because I just want to know whether or not it has a solution
(x^2 + x + 1)y''...

Apr2511 04:28 AM
JJacquelin

5 
1,083 
Hi,
I want to solve the following wave equation:
u_{tt}  c^2 u_{xx} = f(x,t)u
What is the best way to do it?...

May2811 11:00 AM
Tohiko

2 
1,083 
Hi all,
Suppose the solution of a pde exists and is unique, what can be said about the smoothness thereof? In...

Nov3009 05:54 PM
Hootenanny

1 
1,082 
so im working on a problem and i have a question about the step function. lets say that a decaying force is f(t). with...

Nov2211 12:49 AM
I like Serena

1 
1,081 
I don't understand what my professor told me. He said that if a fourieer series of a function f is not continuous then...

Dec809 11:13 PM
LCKurtz

4 
1,079 
I'm trying to solve this equation:
Ux + Uy + U = e^(x+y) with the initial condition that U(x,0)=0
I played...

Apr1210 08:09 PM
gato_

2 
1,079 
Hi everyone,
Im looking for an autonomous first order ode that has the following properties.
For dependent...

Jan2513 12:38 AM
JJacquelin

7 
1,079 
Explain differential equation of order 3? With example?

Nov2608 05:02 AM
HallsofIvy

1 
1,078 
Hey guys,
I have a pretty simple question but I can't seem to find the answer anywhere.
is
y''+xy'5=(x^2)(e^y)...

Jan2210 09:07 AM
matematikawan

2 
1,078 
Hello everyone,
I am solving an eigenvalue problem. Right now, I would like to know;
How to determine the...

May2311 06:05 PM
Urkel

0 
1,078 
Hi everyone,
I have an equation that contains the derivative of the Bessel Function of the first kind. I need to...

Nov1912 07:26 AM
KyleS4562

2 
1,078 
Is this problem possible?
Solve the initial value problem
x''(t) + 6x'(t) + 9x(t) = f(t); x(0) = N, x'(0) = M
...

May1811 04:35 AM
JJacquelin

1 
1,077 
Hello,
What does laplace transformation exactly 'do'? If I have PDE of second order and use LT on it, what do i...

Dec411 05:02 PM
hunt_mat

1 
1,077 
I am solving a problem involving Lagrange Multipliers and calculus of variations and have the equation:
f_{x} ...

Feb112 04:45 PM
shank8

0 
1,077 
Hello guys,
Which method can we use to solve the differential equation below?
dy/dx= 1/(xy+x^2y^3)
It doesn't...

Apr705 09:07 PM
Lyuokdea

5 
1,076 
can any one know how to derive the Lax pair for the cubic nonlinear schrodinger equation?
currently I am interested...

Mar1611 07:23 AM
saravanan13

0 
1,076 
Having a bit of trouble with this equation, I need to find V explicitly and this would obviously be done by...

Apr2812 08:40 AM
JJacquelin

5 
1,076 
Hello, I am looking to apply to heat equation to a cylindrical rod and solving with explicit finite difference scheme....

Apr3013 03:48 PM
bigfooted

4 
1,076 
Hello everyone, I have the following differential equation :
\dot{\theta}(t) = \omega(t) ...

Aug2009 03:14 PM
Feldoh

6 
1,073 
Hello there,
I am solving numerically the ODE
$$ \dot{y} = min \, (y, A) + B\, sin(t)$$ , A,B being constant.
...

Nov2912 01:26 PM
Mute

1 
1,073 
Just a question that came to my mind while studying differential equations.
Ofcourse this is a silly one (I...

Oct1511 03:11 PM
HallsofIvy

1 
1,072 
Hi friends,
I have been trying to solve the ode of second degree below:
d2y/dz2=(i/a*z+b)*y
i is the complex...

Oct1811 06:43 PM
bloodlines

4 
1,072 
Eq
u'(x)+p(x)u=f(x)
with initial condition u(0)=0
It's homogenous solution is
u_h=Ce^{\int^x_0 p(s)ds}

Jan712 05:14 PM
matematikuvol

3 
1,072 
Hello,
In my Differential Equations class we are learning about modelling with first order differential equations....

Sep2813 02:55 AM
UltrafastPED

3 
1,072 
Hey guys,
I'm sure i'm doing something really daft in not getting this to work, but...
I want to use NDSolve to...

Jul510 02:39 PM
rabbahs

1 
1,071 
Hello all,
During the course of a calculation I was doing for my research, I derived a delay integral equation of...

Jul1510 02:58 PM
Mute

2 
1,071 
Hello guys, I am new here to the forum and I was wondering if you could help me with some trouble I am having with...

Oct2910 11:56 AM
Funzies

2 
1,071 
Can anyone tell me if this ODE has an analytic solution? And if it does, how the heck might I go about it?
...

Dec1010 06:46 AM
JJacquelin

4 
1,071 