
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 
135,670 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
29,350 
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 
6,038 
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 
16,287 
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 
2,048 
Can you please help me solve the equation of motion for the following diagram
Thanks

Sep2710 07:54 AM
ManuelF

3 
3,421 
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 
1,505 
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 
1,630 
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 
847 
I've been trying to find the exact solution to the advection equation in spherical coordinates given below
...

Sep2310 04:08 PM
jackmell

1 
2,868 
If we have differential variable of matrix kind ( with dimention 3*3 ) and non matrix ( with dimention 1)...

Sep2410 03:28 AM
madjid222

0 
1,849 
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 
1,236 
Hello everybody,
I have been trying to solve coupled two eigenvalue (SturmLiouville) problems in terms of two...

Sep2710 06:48 PM
Urkel

2 
2,509 
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 
1,852 
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 
2,508 
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 
7,178 
Hello every body,
would you please help me to solve this equation analytically?
actually I'm confused and I don't...

Oct710 01:07 AM
JJacquelin

8 
1,422 
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 
1,215 
Can anyone help with the following:
dy/dx = ay / (bx2 +xy )
a,b constants
thanks,

Oct1310 02:23 PM
Matthew Rodman

7 
1,640 
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 
2,761 
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 
1,084 
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 
1,193 
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 
2,540 
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 
1,087 
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 
930 
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 
1,536 
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 
703 
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 
997 
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 
1,286 
The simple DE under our attention is DE := y(x)' = y^{1/3} \textrm{ with }y(0) = 0.
Apparently this has an infinite...

Oct610 07:05 PM
nonequilibrium

10 
1,279 
Hi,
What seems like a simple problem could be going abit better. Any ideas would be sincerely appreciated.
...

Oct810 08:56 AM
jkent

4 
1,261 
i was wondering if anyone could point me towards any resources (including books, papers, and/or notes) that discusses...

Oct710 02:28 PM
n!kofeyn

0 
2,157 
I am bit confused to use the amending function for my partial differential equation. The point of confusion is 1)why...

Oct810 12:48 AM
adnan jahan

0 
1,085 
\begin{array}{l}
\frac{{\partial ^2 u}}{{\partial t^2 }}  a^2 \frac{{\partial ^2 u}}{{\partial x^2 }} = f(x,t) \\ ...

Oct1110 08:54 AM
kakarotyjn

0 
1,529 
Solve using laplace.
The diff eq is
y'' + 2*y' + *y = 0 subject to y(0)=1 and y(pi)=0
Sorry if notation isn't...

Oct1210 05:43 PM
JJacquelin

5 
3,810 
I moved the thread to the appropriate subforum.

Oct1210 03:46 PM
amature83

0 
1,171 
I attached scans of the questions rather that typing it all here. It's also easier to read.
Questions:...

Oct1310 09:19 AM
HallsofIvy

1 
881 
In Gradshteyn and Ryzhik there is a formula 6.616 number 3
\int_{\infty}^{+\infty} e^{itx}...

Oct1410 02:31 PM
spainchaud

2 
2,948 
I need help with this PDE, it's not an homework, I need to solve it for my thesis and it has physical...

Oct1310 01:16 PM
kosovtsov

1 
773 
Hello all.
I need to model the trajectory of a bullet fired from a gun while being subjected to gravity, drag, and...

Oct1410 11:26 PM
Criticalmass

0 
2,829 
Hi 2 all
Necessary i need ode that's have no general sol nd I need also an ode thats i can solve it with more way ...

Oct1610 07:22 AM
JaredJames

11 
1,502 
(x+y^2)dy=ydx
rewrote as: dx/dy  x/y = y
Realized I had P(y)x and Q(y) rather than the P(x) and Q(x) from equations...

Oct1710 03:32 AM
tinytim

3 
1,919 