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

Feb2313 09:24 AM
micromass

1 
29,593 
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 
136,634 
I want to be able to map the position of a planet given initial position, velocity, and acceleration.
I know the...

Y 08:21 AM
Juan Carlos

2 
1,824 
Hi!, I'm working on a personal project: Solve the heat equation with the semi discretization method, using my own...

Y 08:08 AM
Juan Carlos

2 
125 
Hi all, first of all I apologise if my question is not supposed to be in this thread.
I am a fledgling mathematician,...

Y 02:46 AM
csb

0 
118 
Hey there,
I have modeled a propagating wave in a 1D dispersive media, in which square and cubic nonlinear terms...

Y 01:14 AM
Strum

2 
1,732 
How to understand Uniqueness and existence theorem for first order and second order ODE's intuitively?

Jul2814 02:51 PM
homeomorphic

3 
366 
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 
609 
Can anybody give me some links for plotting bifurcations online?

Jul2714 08:15 AM
ion santra

0 
256 
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 
672 
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 
525 
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 
767 
My textbook says that:
"A differential equation contains both the function and the derivative of the function"
...

Jul2214 04:31 PM
johann1301

3 
605 
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 
586 
Suppose we have some partial differential equation for a scalar ##f##
$$Df = \rho$$
taking values in...

Jul2114 11:27 AM
center o bass

0 
479 
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 
1,847 
For the following problem
\frac{dw}{d\theta}=\theta w^{2}sin(\theta^{2}), w(0)=1
I am not able to obtain the...

Jul2014 04:15 AM
verty

3 
1,049 
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 
3,114 
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 
2,285 
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 
1,274 
Does anyone know how to prove this identity? I don't quote understand why the associated Legendre function is allowed...

Jul1614 05:19 PM
HasuChObe

2 
1,106 
Hi,
I am having a problem implementing 4th Order Runge Kutta (RK4) to solve a non linear ODE.
dy/dt = B(t) ...

Jul1614 03:04 PM
AlephZero

2 
1,151 
I'm doing a practice problem I found online, and I get a solution, but I think it should have a sine term in it. I...

Jul1414 06:21 AM
pasmith

1 
1,502 
As it can be read here, http://en.wikipedia.org/wiki/Laplace_transform#Relation_to_power_series
the Laplace transform...

Jul1214 08:23 AM
HallsofIvy

2 
1,420 
For a regular LR circuit (L and R in series) and with a AC voltage:
http://i.imgur.com/R8yRjNY.jpg
I tried to...

Jul1114 05:18 AM
Waxterzz

2 
1,716 
Hi,
Are there any numerical techniques I can use to solve differential equations with periodic boundary conditions? I...

Jul1014 04:44 PM
SarthakC

8 
1,848 
Is it possible to solve a differential equation of the following form?
$$\partial_x^2y + \delta(x) \partial_x y +...

Jul914 09:26 AM
the_wolfman

1 
1,728 
This is about attempting to solve ##\left( y'\right)^2 = y^2  1 ##.
\int\frac{dy}{\sqrt{y^2 1}} = \pm \int dx
...

Jul914 05:47 AM
pasmith

2 
1,317 
f(z) = sq. rt of z1 / z+1  both numerator and denominator are inside the radical.
I can write it as (z1)^1/2...

Jul714 07:33 PM
HallsofIvy

2 
1,728 
Hello, everybody.
I'm trying to replicate plots from
Yang et al. 2002. Spatial resonances and superposition...

Jul514 10:47 AM
jssdenton72

2 
2,512 
Is it possible to convert a general linear second order boundary value ode
y'' + P(x)y' + Q(x)y = g(x), y(a) = y_a,...

Jul514 03:12 AM
bigfooted

1 
1,809 
I am setting up a numerical simulation from a 2D discretization of the heat equation in cylindrical coordinates.
my...

Jul414 12:55 PM
geetar_king

2 
2,254 
If I have a function "F" in a twodimensional space F(x,t) and its analog F' in another coordinate system F'(x',t')...

Jun3014 03:23 PM
MathematicalPhysicist

1 
1,999 
Hi,
I desperately need help to solve the following differential equation for buckling of a beam with a uniform...

Jun3014 06:51 AM
AlephZero

20 
5,748 
Are these statements correct, if not could you give me an example
1. If solution of IVP is nonunique then there...

Jun2714 02:58 AM
kochibacha

1 
1,793 
Hi, all. I'll be brief. Can Airy functions be considered orthogonal over some interval? If so, what is their...

Jun2614 10:49 PM
skujesco2014

2 
1,906 
Hello! This is my first post to this excellent forum! I would like some help with this exercise:
u_{xx} (x,y) +...

Jun2514 09:10 AM
UltrafastPED

1 
1,823 
The Schrodinger equation is of the form \frac{d^2 \psi}{dx^2}+ \psi=0.
In a lecture, the lecturer said that if we...

Jun2514 12:10 AM
Shyan

4 
2,237 
Hİ. How can we sure that the initial conditions , say, for a secondorder linear equation must be unique which is also...

Jun2414 12:09 PM
mecheng

2 
1,811 
Hi there!
I have the following property:
If x(t) is a solution of \left\{ \begin{array}{l} \dot{x} = f(x) \\...

Jun2314 06:38 PM
brunob

2 
1,806 
Hi, all. While solving a second order linear differential equation why do we have to use linear independent but two...

Jun2314 06:50 AM
SteamKing

6 
1,960 
Hello,
I am searching for the Laplace transform of this function
u_a(y)\frac{\partial c(t)}{\partial t}
...

Jun1914 04:32 AM
ptrinka

3 
1,911 