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

Feb2313 09:24 AM
micromass

1 
28,316 
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 
131,156 
My question is in regards to systems of ordinary differential equations. One of my research topics right now involves...

Sep2112 07:25 PM
Chestermiller

5 
1,308 
I have a trouble finding a method other than Variation of Parameters to solve
y'' + 2xy' + (1+x2)y = 0.
Does there...

Sep2012 03:04 PM
HallsofIvy

1 
965 
I'm in truble with a partial differential equation. Actually it is a system of PDE but It would be useful to solve at...

Sep2012 01:34 AM
L0r3n20

6 
3,415 
I am really confused with the concept of Neumann Boundary conditions. For the simple PDE
ut=uxx for the domain...

Sep1712 05:46 PM
tlonster

0 
1,221 
I am trying to solve:
(x + 1 + f(x) )(1  f ' (x) ) = x+1
f(0) = x_0
x in (1,1)
I approximated it...

Sep1512 11:54 PM
haruspex

5 
1,481 
I'm inverting this:
Y = s2 + 15s + 17 /
I'm using PF expansion,
A/(s+1) + Bs + C/(s2 + 13s  4), I however...

Sep1412 10:48 AM
maistral

1 
944 
please help by telling me whether my approach to solve the problems are right or wrong. please refer to the ATTACHMENT...

Sep1112 10:03 PM
chiro

1 
1,209 
For example,
ODE: y'' + y = 0
solve this problem using MAPLE
f(x) = _C1*sin(x)+_C2*cos(x)
My question is...

Sep1112 03:42 PM
nufeng

2 
1,221 
I am having major problems understanding these types of questions, where you will have water and in will be chemicals...

Sep1012 09:59 PM
Chestermiller

6 
1,713 
Hi all,
I've got a nonlinear differential equation of the general form
y' + f(x)y + g(x) = h(x)(y^n)
to...

Sep812 10:36 AM
bradbrad

2 
1,410 
Hi all
Quick one, if one had an equation y' = x on could simply separate the variables and integrate. Now it the...

Sep712 06:07 PM
koab1mjr

2 
1,365 
hallo I ams earching analytical solution for system of two ODE in next form
x*(dy/dr)  (y*y/r) =...

Sep712 01:23 AM
trentar

2 
1,148 
I had kind of a general question. Say I have a second order, homogeneous ODE. Say I use one of the general...

Sep512 01:51 PM
dumbQuestion

4 
1,233 
Hi,
i'm writing a pseudospectral code to solve the inviscid burgers' equation with periodic boundary condition....

Sep512 10:34 AM
giordi

0 
1,335 
These DEs are the constraints on the functions C(r,\phi) and B(r,\phi) that zero an acceleration vector.
...

Sep312 05:32 PM
Mentz114

0 
984 
Ok I'm supposed to Solve this problem using Laplace Transforms.
\frac{d^2 x}{dt^2}+2\frac{dx}{dt}+x = 5e^{2t} + t...

Sep312 02:43 PM
geno678

4 
1,359 
Hello everyone! I am fairly new to SDE theory, so I'm sorry if my question may be a bit naive. I have the following...

Sep312 07:23 AM
sith

1 
1,076 
I am having confusion, so from what I understand for an exact DE
dy/dx = some DE and you can manipulate it so that...

Sep312 05:08 AM
Simon Bridge

6 
1,247 
All,
As part of my research I came up with a boundary value problem where I need to solve the following system of...

Sep112 01:13 PM
meldraft

18 
3,023 
Hello everyone,
I am making use of Mathematica to solve differential equations developed by Lagrange method,
I...

Aug3112 09:19 PM
sky8754180

0 
920 
Would someone be able to help me with the quesiton
Life cycle of butterfly is egg > caterpillar > butterfly....

Aug3112 11:51 AM
Chestermiller

8 
1,573 
Hello All,
I am new to this community but by reviwwing the questions and answers posted in this forum I was...

Aug3112 06:39 AM
chiro

3 
1,258 
hi guys , i want to write a complicated differential equation as autonomous equations , is there any method ? i have...

Aug3112 02:21 AM
voko

1 
1,006 
As expected, my text book and teacher are both lacking clear, concise examples for me to work with, so would someone...

Aug2912 10:39 PM
ericm1234

2 
1,151 
Dear Brains
I am working on fuel consumption maps to be included in vehicle simulation software to calculate the...

Aug2912 07:36 AM
aLEx7

0 
952 
Hi!
I have a system of four differential equations:
\dot{x}(t)=Ax(t)+a
where A\in R^{4x4} and a\in R^{4} are...

Aug2912 05:25 AM
jacobrhcp

2 
858 
Folks,
I am looking at the Ritz method for the following problem
##\displaystyle \frac{d^2 u}{dx^2}u+x^2=0##...

Aug2712 12:28 PM
bugatti79

2 
1,649 
Hi, I'm really interesting of PDE, but I don't really know what I have to learn before start with PDE.
I have learn...

Aug2612 05:39 PM
Unstable

10 
1,874 
If given a cauchy euler equation (nonhomogeneous) equation, does the approach in looking for a particular solution...

Aug2612 03:51 PM
ericm1234

3 
1,973 
Hi there,
I arrived at the solution for a electric potential problem for a semiinfinite cylinder (there was a...

Aug2512 01:08 PM
OneMoreName

1 
910 
Hey guys, new here and this is my first post. Wondering if anyone could help me.
So I've encountered a problem on...

Aug2312 01:32 PM
AlephZero

3 
1,115 
Hello! When solving a PDE (for instance Maxwell's equations) using a commercial finite element tool, I have the choice...

Aug2312 07:32 AM
daudaudaudau

0 
1,159 
I'm trying to solve a set of differential equations that all depend on a parameter, κ. I can use the system of ODEs to...

Aug2212 04:50 PM
Chestermiller

4 
1,921 
Hi,
Say I have this pde:
u_t=\alpha u_{xx}
u(0,t)=\sin{x}+\sin{2x}
u(L,t)=0
I know the solution for the pde...

Aug2212 04:28 PM
robl123

2 
997 
Hey gang, how would you specifically define what a nonlinear DE is? I mean, what specifically qualifies a DE to be...

Aug2212 04:03 PM
Unstable

4 
928 
Folks,
I am stuck on an example which is partial differenting a functional with indicial notation
The functional...

Aug2212 03:26 PM
bugatti79

2 
1,134 
I need a little help on how does the iteration process. I know how RungeKutta 4 works, but I don't know how this...

Aug2212 01:13 AM
maistral

7 
1,349 
Hello all,
I am trying to solve the FPE in 2D,
The equation is (with implied summation over repeated indices):...

Aug2112 02:59 PM
sokrates

0 
1,024 
Is there a different procedure of propagating error through differential equations or is it the same for a function?

Aug2112 01:19 PM
JPBenowitz

0 
783 
Hi all,
first of all, I have to admit I have often used this richness of knowledge that permeates through the posts...

Aug2012 05:42 PM
Mute

5 
1,379 