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

Feb2313 09:24 AM
micromass

1 
30,192 
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 
138,534 
Im writing a program that calculates the trajectory of a particle in an arbitrary force field.
the force field is a...

T 02:14 PM
bluntwcrackrap

5 
170 
I had a brief question regarding SDEs. Typically, I've seen models like the OrnsteinUhlenbeck process that generally...

Y 07:42 PM
Matterwave

5 
121 
Firstly, if this is an inappropriate forum for this thread, feel free to move it. This is a calculusy equation...

Y 10:17 AM
Greg Bernhardt

1 
153 
I took an introduction to ODEs course this past spring semester. It always bothered me where this thing came from. I...

Y 08:09 AM
FactChecker

9 
189 
Find y(t), the inverse laplace transform of Y(S).
Y(S)= 10 U(S)/2 + 2/(s4) + s/((s+1)(s+2))  6/(s4)^4.
...

Aug3114 03:30 PM
white.carbon

0 
82 
Hello,
I was just after an explanation of how people get to this conclusion:
Say you are looking at the...

Aug2814 06:31 AM
jtbell

2 
339 
1. why do we need to use shifted unit step function in defining second shifting theorem?
2. why don't we instead...

Aug2714 07:45 AM
asitiaf

2 
182 
hello. I have a matlab skeleton provided because i want to model a distribution with a circular geometry. all in all,...

Aug2514 06:19 AM
Strum

2 
148 
What is the vector space under consideration when we say that a linear differential equation is of the form
Dy=f ...

Aug2414 07:30 AM
V0ODO0CH1LD

13 
453 
Is it possible to solve a differential equation of the following form?
$$\partial_x^2y + \delta(x) \partial_x y +...

Aug2314 03:55 AM
Simon Bridge

2 
2,079 
For the following problem
\frac{dw}{d\theta}=\theta w^{2}sin(\theta^{2}), w(0)=1
I am not able to obtain the...

Aug2114 03:12 PM
rjr

4 
1,305 
Hi friends i am trying to solve heat equation for a single time domain,with Finite Difference Method. I wrote a...

Aug2014 02:52 PM
Strum

2 
215 
Suppose all second partial derivatives of F = F (x, y) are continuous and F_{xx} + F_{yy} = 0 on an open rectangle R. ...

Aug1914 10:47 AM
Medicol

3 
221 
Greetings all !
This is my first post on the forum, so please kindly let me know if I am not asking a proper...

Aug1814 03:12 PM
atto

4 
279 
I want to solve the following differential equation using matlab and thus want to plot between x & y....

Aug1714 04:27 AM
da_nang

1 
157 
hi pf!
ok, so my math text for PDE's states the following theorem: $$f(x) = \sum_n a_n \phi_n (x)$$ for "nice...

Aug1414 11:25 PM
Shyan

8 
335 
Hi, while solving differential equations problems we have to sometimes use absolute value while
taking an integral of...

Aug1314 11:30 AM
HallsofIvy

3 
217 
Hi guys ,
I'm currently reading a book and I faced this with DEs:
In the 5 attached images you'll find the textbook...

Aug814 11:50 PM
Simon Bridge

1 
345 
Hi everyone,
i am trying to solve and program a non linear differential equation in matlab where thermal conductivity...

Aug814 11:04 PM
Chestermiller

7 
245 
http://www.math.uiuc.edu/documenta/volismp/40_lemarechalclaude.pdf
I don't understand why we use theta for...

Aug814 07:32 AM
HallsofIvy

1 
222 
Here's the problem:
Find the general solution of x*dy/dx+2y=10x^2.
How do I find the answer for this problem on...

Aug714 07:50 AM
Sunfire

2 
228 
This is a bit counterintuitive to me that the gradient vector is always normal to the level curve
and the level...

Aug614 07:12 AM
HallsofIvy

2 
222 
Hi all, first of all I apologise if my question is not supposed to be in this thread.
I am a fledgling mathematician,...

Aug514 11:22 PM
Greg Bernhardt

1 
275 
Can anybody give me some links for plotting bifurcations online?

Aug514 11:22 PM
Greg Bernhardt

1 
379 
Suppose we have some partial differential equation for a scalar ##f##
$$Df = \rho$$
taking values in...

Aug514 11:22 PM
Greg Bernhardt

1 
775 
does negative divergence of gradient tempearature gives to lalace equation...?
div(∇T) =

Aug514 07:32 PM
SteamKing

1 
202 
I want to be able to map the position of a planet given initial position, velocity, and acceleration.
I know the...

Jul3014 08:21 AM
Juan Carlos

2 
2,277 
Hi!, I'm working on a personal project: Solve the heat equation with the semi discretization method, using my own...

Jul3014 08:08 AM
Juan Carlos

2 
275 
Hey there,
I have modeled a propagating wave in a 1D dispersive media, in which square and cubic nonlinear terms...

Jul3014 01:14 AM
Strum

2 
1,997 
How to understand Uniqueness and existence theorem for first order and second order ODE's intuitively?

Jul2814 02:51 PM
homeomorphic

3 
496 
Hi. First off, sorry for the not so descriptive title. If one of you finds a better tilte I will edit it.
We have...

Jul2814 03:27 AM
Strum

1 
815 
Hello Everyone.
I have a question. Suppose I have a differential equation for which I want to find the values at...

Jul2614 12:39 AM
crossfire234

1 
815 
I'm currently reading Tolstov's "Fourier Series" and in page 58 he talks about a criterion for the convergence of a...

Jul2514 02:49 PM
jbunniii

2 
736 
When deriving the RungeKutta Method to solve y'=f(x) we need to use Taylor expansion. Hence we need to differentiate...

Jul2314 01:30 AM
matematikawan

4 
957 
My textbook says that:
"A differential equation contains both the function and the derivative of the function"
...

Jul2214 04:31 PM
johann1301

3 
887 
I want to show, in a talk, how to build the PredatorPrey (Lotka Volterra) model. It starts off with the "Population...

Jul2214 07:09 AM
dkotschessaa

2 
771 
According to the confluent hypergeometric equation
\frac{d^2}{d x^2} y + \left(c  x \right) \frac{d}{d x} y  a y =...

Jul2014 03:44 PM
Domdamo

3 
2,186 
Hi,
I'm trying to find the first integral of motion for this set of PDE. I'm not really that familiar with this...

Jul1714 11:44 AM
Alicelewis11

2 
3,496 
Hi  wondering if you can help me find a solution of:
\nabla^{2}u\frac{u}{\lambda^{2}}=a\delta(r)
for spherical...

Jul1714 09:17 AM
jasonRF

3 
2,608 
Consider the following linear functional operator:
$$Q_w = \lim_{h\rightarrow w} \lbrace \frac{f(x + h)  f(x)}{h}...

Jul1614 06:17 PM
da_nang

1 
1,507 