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

Feb2313 09:24 AM
micromass

1 
30,191 
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 
138,532 
Hi,
I want to solve the EulerBernoulli eq numerically using a c++ library.
EI y^{4}(x)=f(x),...

Oct1112 10:57 AM
Mute

1 
702 
A first order DE models the rate of change, e.g. when decay is proportional to time we have the DE: dM/dt = K.M; this...

Oct1012 08:40 AM
HallsofIvy

5 
1,234 
find a solution of (a^2x^2)y''2xy'+n(n+1)y=0, a not 0 by reduction to the legendre equation???

Oct1012 08:32 AM
HallsofIvy

3 
1,328 
Dear Friends,
Would you please provide me with some hints to find the analytical solution of the nonlinear PDE given...

Oct912 05:37 AM
mohammad449

2 
911 
I thought I've seen one, but I do not understand exactly how they negate.
For example, if you have d/dx^2 + 1, does...

Oct812 06:21 AM
micromass

16 
7,714 
I wish to transform my diff. eq.
(1/r)*(dy/dr)*(d2/dr2(r*y))*dr into a more convenient expression, in a similar to...

Oct712 03:36 AM
Shan K

9 
1,800 
Dear Friends,
I encountered with some difficulties in solving following PDE (off course, analytically not...

Oct612 02:42 AM
mohammad449

4 
1,571 
Hi guys, is there a general method by which to solve a differential equation of form:
D(t)=h'(t)(1/h'(t))' +...

Oct512 06:49 AM
Aspiring

0 
936 
Dear All,
I am working on electrical modeling which I cannot change divergence to matrix form to solve it with...

Oct412 08:47 PM
AGerami

0 
976 
Hello there,
I have read in a paper the following statement,
"due to the nonconservtaivness of the system the...

Oct412 02:01 PM
muzialis

0 
828 
If Po dollars are deposited in an account paying r percent compounded continuously and withdrawals are at a rate of...

Oct412 11:20 AM
Chestermiller

3 
1,137 
Hello all~
Given the equation:
dy/dx = (x/y)
I know we would initially go to:
∫dy =∫ (x/y) dx
then too:...

Oct312 11:54 AM
Studiot

3 
1,199 
I've had to take diff eqtns now and I'm trying to get my head around Laplace again.. it's been a while. I can't seem...

Oct212 05:55 AM
chief10

24 
2,207 
HOW IS THE FOLLOWING QUESTION DONE?
Milk chocolate is being produced in a 300 litre tank, which initially...

Oct112 09:56 PM
nishcha7

3 
1,646 
now say we have cos^2(3t), how would you go about computing it with the 3t?
i can manage cos^2(t) but i'm not sure...

Oct112 10:39 AM
chief10

2 
1,557 
I've tried almost everything but i still get stuck when finding the integral of :
(2x^2ye^(x^2))dx+(x+1)dy =0
...

Sep3012 12:57 AM
JJacquelin

4 
1,429 
How is this question done??
Milk chocolate is being produced in a 300 litre tank, which initially contains 100...

Sep2912 10:28 AM
Chestermiller

4 
2,110 
Hi,
I have the equation
y' = y^2 + x^2 and am asked to linearise the equation with the appropriate substitution and...

Sep2912 04:42 AM
JJacquelin

4 
1,771 
In the course of my research I came across this PDE ...

Sep2812 09:04 AM
jedishrfu

2 
837 
My homework is due really soon.
Here are all the questions I have absolutely NO idea how to do.
1.
Let:
f(X) =...

Sep2612 05:00 PM
HallsofIvy

4 
2,834 
I'm currently reading a textbook on the application of Lie symmetries to differential equations (Symmetry Methods for...

Sep2612 11:22 AM
dydxforsn

2 
1,235 
I saw this post at stackexchange:
I ran across this post when trying to solve a homework problem. But I have no...

Sep2412 03:19 PM
Yondaime5685

2 
1,807 
hello everyone!
I had a stuck in solving problem for a week now, so need help.
Please help!
the problem is as...

Sep2412 08:53 AM
voko

3 
1,051 
Hi, I have the attached diffusion based equations I am looking to solve, however I am unsure about how to implement. ...

Sep2412 08:31 AM
baseball1234

1 
1,215 
Im trying to generate turing patterns for brusselator equations, with Octave. It is quite similar to Matlab. I have my...

Sep2412 02:59 AM
dennisb

0 
1,540 
Hello,
I need to use the Gronwall inequality to discuss existence/uniqueness of the solution to the initial value...

Sep2312 01:52 PM
JMeyer

0 
1,150 
Hi:
I have come across a PDE of the following form in my research:
C_1 \alpha(t,r) + C_2 \partial_t \alpha(t,r)...

Sep2212 05:25 PM
Norfonz

1 
959 
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 
1,349 
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 
990 
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 
4,752 
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 
1,240 
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 
1,511 
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 
958 
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 
1,249 
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 
1,271 
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 
1,739 
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 
1,451 
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 
1,403 
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 
1,179 
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 
1,271 