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

Feb2313 09:24 AM
micromass

1 
25,904 
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 
121,414 
f'+x*f=x^(2m+1), m is an integer
I have no idea for finding particular solution.
Any help would be appreciated.

Mar1311 07:03 PM
pashav46

3 
1,089 
Hi everyone
I'm modeling the dynamics of a cantilever that has a nonconstant linear density profile, i.e.
...

Mar1211 06:01 PM
AlephZero

1 
1,467 
Hi,
I hope I posted in the right group. I read some papers about infinite dimensional systems and gave PDEs as...

Mar1111 02:56 AM
zhidayat

4 
2,449 
Hey, I'm looking for some help understanding how to solve these equations. The math is just a little bit beyond me. I...

Mar1111 12:55 AM
Redbelly98

8 
1,761 
As the title says, what does it mean for an equation to be homogenous?

Mar1011 06:41 PM
bmed90

3 
2,423 
I've written a Runge Kutta algorithm that uses a fixed step size. It works fine for many of my problems dealing with...

Mar1011 03:26 PM
AlephZero

3 
1,942 
Hi, could anyone give me a hint on what method to use to solve this ODE:
v''+(2/t)v'+(b)v=0,
b is a constant and...

Mar1011 01:37 AM
JJacquelin

1 
749 
I'm not sure if I'm using the correct terminology, but just to be sure let me explain what I understand to be coupled...

Mar1011 12:11 AM
omarxx84

4 
5,192 
Hi, I'm not really understanding how to convert the piecewise heaviside into a single function. This was on our quiz...

Mar911 10:41 PM
LCKurtz

2 
2,912 
Hello,
I have a parallelepiped domain, divided in nodes. Each node has a velocity vector (3D). I want to evaluate...

Mar911 02:01 PM
yus310

1 
1,402 
Hi everyone, I recently started studying heat conduction using differential equations and this has been stumping me...

Mar911 01:36 PM
yus310

2 
3,054 
The usual eigenvalues of a LTV system does not say much about the stability but my intuition tells me there should be...

Mar811 09:21 PM
dwlink

1 
2,227 
Can anyone please suggest whether I can use matlab ode45 for the numerical solution of the following equations?
mx...

Mar811 04:28 PM
AlephZero

12 
3,729 
How do I find a general solution to a differential equation when the answer is a constant?

Mar811 03:35 PM
Rubik

8 
1,825 
What is a finitedifference discretization for the partial differential term:
\frac{\partial^4\phi}{\partial...

Mar811 01:03 PM
Hypatio

4 
2,069 
Hiii,
In my research i encountared with following 3rd order ODE:
d^3y/dx^3 = (1y)/y^3.
my B.C. are:
at x...

Mar611 10:09 AM
oby7842

2 
1,253 
Hey guys,
dx/dt= (1/n)cos(tnx)
Investigate the possibility of straight line solutions and discuss the...

Mar511 08:24 AM
Samantha24

0 
1,049 
To determine the value of the unknown for which the function is minimized, we take the derivative and equate with 0....

Mar511 06:30 AM
onako

2 
683 
Hello all, I'm currently an undergrad in my first year doing an experiment with the brachistochrone and I wish to...

Mar511 12:36 AM
Dickfore

3 
1,542 
Hey folks I'm experimenting with symplectic integrators and I'm trying to figure out how to deal with fourth order...

Mar411 04:37 PM
Deadstar

1 
2,675 
For the solution of a PDE, I need to change the coordinate to a curvilinear system. Inverse formulation for the...

Mar411 10:26 AM
fery

0 
700 
For y1 = t2 and y2 = tt (y2'' is not defined at t = 0), the Wronskian is 0 for all t over the interval . However,...

Mar311 09:48 AM
lurflurf

1 
1,099 
I have the following DE:
y'=y*(1y^2)
And understand that y=0, and y=+/1 are critical points
I am confused as to...

Mar211 01:35 PM
dillonmhudson

2 
1,503 
Alright. So I have dy/dx = 1y2. I want to take the second derivative to get some information about the concavity of...

Mar111 04:17 PM
AlephZero

5 
2,019 
Hello physics enthusiasts! I was looking for resources, and stumbled upon these awesome forums.
I am looking for...

Feb2811 05:30 PM
veneficus5

5 
1,808 
Hi,
I am trying the solve the Poisson equation in a domain with curved boundaries using the Finite Difference...

Feb2711 11:35 PM
sashankhrao

0 
1,675 
I was looking through my DE book and a problem intrigued me. I eventually figured it out but I do not understand the...

Feb2511 04:42 PM
Xyius

6 
2,348 
Dear Sir/Madam,
Who knows the original publication of Laplace transformation by Laplace? Which journal and what...

Feb2411 01:15 PM
SteamKing

1 
894 
Just learned that diffusion equation loses information as time goes on,i.e. given the initial condition at t=0, we...

Feb2411 05:48 AM
kof9595995

0 
563 
someone kindly help...
Considering this second order equation….kindly solve by adomian decomposition:,
m(dy/dx)^2 ...

Feb2311 05:44 AM
chwala

0 
1,397 
Hi
I have 8 equations where the first four are coupled and the second four is coupled. The first set is independent...

Feb2311 05:07 AM
pjconradie

0 
745 
If we have a linear system with the following differential equation:
d2y/dt2+7*dy/dt+12*y=dx/dt+5*x
So H(s) =...

Feb2311 12:46 AM
logicman112

0 
939 
Hi,
I have a system of coupled PDE's as follows:
A1 * (f,xx + f,yy) + B1 * (g,xx + g,yy) + C1 * f + D1 * g = 0 ;...

Feb2211 09:01 AM
FrankST

0 
1,920 
To solve a PDE, we can use the technique of separation of variables. However, this is not the most general solution. ...

Feb2211 07:44 AM
HallsofIvy

1 
1,150 
Please see the pdf document below
nevermind I figured it out

Feb2111 02:43 PM
blueberrypies

0 
735 
Question:
If the roots of the characteristic equation are real, show that a solution of ay" + by' + cy = 0 is...

Feb2011 12:34 PM
diligence

5 
3,337 
y'' + 4y = ax + b
for y(x), and a & b are constants.
either rough guideline (for both homogeneous and particular...

Feb2011 08:35 AM
Redbelly98

6 
1,940 
I have a rather difficult math problem. In my circuits class the professor prefers to express the cosine function...

Feb1911 05:57 PM
skweiler

2 
3,892 
I am trying to find the general solution for this problem:
dX/dt = A(t) exp Y(t)
dY/dt = A(t) exp X(t)
where...

Feb1911 03:13 AM
Chen

0 
1,201 
I have a PDE test next week and I'm kinda confused. How do you prove that eigenvalues are all positive? I know...

Feb1811 02:14 PM
ekalbh

2 
1,548 