
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 
138,276 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
30,075 
Well, i realy i am pissed at the moment because of this. I have been trying to figure out if there is a...

Sep2410 02:27 AM
notpigfly

16 
6,109 
How do I reduce an equation to Bessel's equation and find a general solution to it:
For example how do I solve...

Sep2310 10:27 PM
abhishekgoyal

9 
16,403 
I am a freshman in college and I am in multivariable calculus, I took the first AP calc in highschool. I am deciding...

Sep1410 12:51 AM
n1person

6 
1,183 
Hi, Simple question here.
What is the difference between \Delta x and dx in differential calculus? Do they both...

Sep2510 02:18 AM
mechprog

7 
2,069 
Hello all! :smile: I through a section in my text (by Greenburg) on 1st Order linear ODEs. I am understanding the...

Sep1510 08:12 PM
klondike

4 
3,232 
A person who weighs 200 lbs is falling through the sky while attached to a parachute. The equation of the downward...

Sep1710 09:44 AM
HallsofIvy

3 
1,833 
Hey everyone.
I've got through most of a problem that involves finding an inverse laplace transform, but I am...

Sep1210 11:12 PM
n.karthick

1 
882 
If my Force = (gamma)(dx/dt)
velocity v = dx/dt
Mass m
(m)(dv/dt) = F = (gamma)(dx/dt)
Now I want to...

Sep1910 09:40 AM
astonmartin

2 
931 
Hey. I am having a hard time solving this problem.
(x^2)y' + 2xy = 5y^4
I get as far as simplifying to
y' = ...

Sep1510 04:36 AM
LawlQuals

2 
1,011 
Hello,
I am facing a diffusion equation..
\frac{du(x,t)}{dt} = D \frac{d^2u}{dx^2}
.. with slightly exotic...

Sep1810 01:28 PM
Thaakisfox

3 
2,272 
What is the big advantage of using method of poincare sections and return maps in periodic solutions of differential...

Sep1410 02:58 AM
ajaleelp

0 
821 
I am trying to find the solution to a problem defined as follows:
(\partial_x^2K^2)^2...

Sep2010 12:00 PM
klondike

6 
1,885 
Hi, I was solving the following second order ODE:
...

Sep1910 09:41 AM
jaseh86

5 
2,245 
I need to solve d/dx(e^((x^2))*(du/dx))=u+x*(du/dx)
I get e^((x^2))*u''2xe^((x^2))*u'=u+x*u'...

Sep1710 02:58 AM
jackmell

3 
2,932 
I have the following exact equations, however, teacher said it is incorrect. Cannot find a mistake. Could you please...

Sep1710 09:32 AM
HallsofIvy

2 
795 
\Delta\psi(\vec{r},t)\frac{1}{\upsilon^2}\frac{\partial^2\psi(\vec{r},t)}{\partial t^2}=g(\vec{r},t)
How to get...

Sep1910 09:28 AM
arkajad

4 
2,513 
High
I am working on the geometrically nonlinear finite element method. I now that in this method, the internal...

Sep1910 09:06 AM
HallsofIvy

1 
1,157 
for
\Delta w = \frac{ \partial^{2} w }{x_{1}^{2}} + \frac{ \partial^{2} w }{x_{2}^{2}}
and \nabla =...

Sep1910 03:07 PM
Somefantastik

0 
1,387 
Can you please help me solve the equation of motion for the following diagram
Thanks

Sep2710 07:54 AM
ManuelF

3 
3,439 
Hello!
I would like to show the following: u\in C^2(U) \cap C(\bar{U}) satisfies \Delta u(x)>0 for any x\in U, then...

Sep2510 02:00 PM
loesung

2 
1,516 
I simply can't recognize it
y' = \frac{1}{3}y^{\frac{1}{2}} + t^{\frac{1}{3}}
Which type of differential...

Sep2410 07:41 AM
jackmell

7 
1,642 
Hi guys,
Can someone please explain how you find the eigenvalues of this type?
u''+\lambda u =0
or point me...

Sep2310 04:27 AM
Pythagorean

1 
858 
I've been trying to find the exact solution to the advection equation in spherical coordinates given below
...

Sep2310 04:08 PM
jackmell

1 
2,905 
If we have differential variable of matrix kind ( with dimention 3*3 ) and non matrix ( with dimention 1)...

Sep2410 03:28 AM
madjid222

0 
1,866 
hi frinds im new to this forum pls guide me if im wrong at any place
im very much confused abt finding the degree...

Sep2610 01:51 AM
cindrilla

19 
1,248 
Hello everybody,
I have been trying to solve coupled two eigenvalue (SturmLiouville) problems in terms of two...

Sep2710 06:48 PM
Urkel

2 
2,521 
Hello!
I am trying to solve...
u*ux + uy u = 0 with i.c. u(x,0) = x +10
Determine: a.) characteristic...

Sep2610 10:19 AM
ZachN

4 
1,867 
When comparing time and frequency domains, it is easy to imagine the meaning of the Fourier transform.
In time...

Sep2710 04:31 PM
psmitty

1 
2,524 
Hello,
I joined a class on Partial Differential Equations 3 or 4 lectures late, so I have missed the classes...

Sep2710 11:03 PM
Eynstone

1 
7,212 
Hello,
I just wanted to know how we moved from the first to the second equation,namely the () sign.
...

Sep2910 04:45 AM
electronic engineer

0 
1,225 
So i have an organic chemical in a biofilm reactor being diffused into a biofilm and also being metabolized at...

Oct210 12:43 AM
Eynstone

1 
2,780 
I'm looking at linear, 1st order ODEs, like
y' + p(t)x = q(t)
The notes I'm looking at are calling q(t) the...

Oct410 10:07 AM
jambaugh

2 
1,091 
I had posted a thread on another forum about building a 100GHz oscilloscope which resulted in the signal being chopped...

Oct110 07:51 PM
rebeka

0 
1,201 
Here is an image of the first order linear differential equation and my attempt to solve it. It ends in an integral...

Oct310 03:05 AM
JJacquelin

4 
2,570 
I'm trying to follow a proof for the solution of the diffusion equation in 0 < x < l with inhomogeneous boundary...

Oct310 03:30 PM
jackmell

1 
1,097 
Shall f be continous function of two real variables. Proof that if equation x''=f(x,x') has not constant solutions,...

Oct410 06:23 AM
Eynstone

1 
942 
a\text{''}+B*a'A*a==0
a = 10^9
a' = 0
a = ?
The coefficients A and B are variable over time. I HAVE solved...

Oct410 12:37 AM
Simon_Tyler

1 
1,549 
Hi! I am trying to understand the MP for the heat eqn. in \mathbb{R}^n (see attached jpegs below). I don't understand...

Oct310 11:17 PM
loesung

0 
710 
I am new to differential equations, any help would be great.
I have a ODE of the second order u''x = e^x over the...

Oct410 02:22 PM
dinaharchery

1 
1,006 
Can anyone help me find the bifurcation value of dy/dt = y^3 + ay^2 where a is the parameter. I found that the...

Oct510 08:05 AM
jackmell

1 
1,302 