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

Feb2313 09:24 AM
micromass

1 
30,360 
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 
138,901 
According to the confluent hypergeometric equation
\frac{d^2}{d x^2} y + \left(c  x \right) \frac{d}{d x} y  a y =...

T 10:21 AM
Domdamo

4 
2,231 
Hello
I'm struggling with wellknown problem of finding shortest path between two points on a sphere using calculus...

T 06:56 AM
Blazejr

2 
125 
With
$$
H = \alpha \left(x^{2}\partial_{x}  x \partial_{x} \right) + \beta\left(x \partial_{x}^{2} ...

T 02:18 AM
Strum

0 
74 
sorry for spamming the boards with all these questions lol i promise this is my last post regarding n body problems....

Y 09:35 PM
bluntwcrackrap

3 
210 
I was reading this interesting article on different varieties of roller coaster loops, and I know nothing about...

Sep1414 12:50 PM
FactChecker

2 
139 
Heya folks,
I'm currently pondering how to decide whether a function has an inverse Laplace transform or not. In...

Sep1314 10:51 PM
qftqed

0 
127 
Hi everyone,
I need some help to solve this differential equation.
The question states "Use the perturbation or...

Sep1214 02:05 PM
Johnmm

11 
390 
Hello,
First I'd like to state that I understand how to show that a relation defines an implicit solution of a...

Sep1114 06:37 PM
_N3WTON_

1 
96 
For each epsilon greater than 0, show that the differential equation x'=x^21cos(t)epsilon has at least one periodic...

Sep1114 02:10 PM
jambaugh

1 
137 
I took an introduction to ODEs course this past spring semester. It always bothered me where this thing came from. I...

Sep1014 05:52 PM
priti2014

13 
403 
the force field trajectory calculator worked pretty good, so i decided to step it up and solve the famous n body...

Sep1014 01:49 PM
bluntwcrackrap

2 
226 
Hi,
I'm an engineer who uses a lot of finiteelement software for doing multiphyics modeling. I've been learning a...

Sep914 07:11 AM
NumericalFEA

10 
578 
Hi,
I want to solve the following diffusion equation:
(d/dt) C(r,z,t)=D*∇^2 C(r,z,t)
where C is the...

Sep814 07:26 PM
nazmulislam

2 
159 
Hello,
it is known that given a certain recurrence relation that describes a sequence of numbers, it is often...

Sep814 11:35 AM
mnb96

0 
88 
Hello,
I was just after an explanation of how people get to this conclusion:
Say you are looking at the...

Sep814 11:08 AM
Gwinterz

3 
408 
Hi, I was just wondering if :
(y^2  1)*dx/dy + x = 0
In this case, x is the dependent variable.
Is linear?...

Sep814 07:36 AM
HallsofIvy

2 
136 
I'm trying to do some refreshing of differential equations featuring damped systems. Specifically, I have a question...

Sep814 07:24 AM
HallsofIvy

1 
109 
In most textbooks I've read and programs I've work with, differential equations are normalized (made dimensionless)...

Sep714 08:38 PM
X89codered89X

3 
288 
Hi all ,
I would like to solve the following partial differential equation.
(∂α/∂t)=G *(a'a)
I attached the...

Sep714 09:47 AM
bigfooted

4 
206 
I was wondering if there is a way to get specific numerical values for the following differential equation:
f'(x)+...

Sep614 05:38 AM
DMT69

5 
164 
When talking about ordinary (real) linear differential equations with constant coefficients the idea is that we are...

Sep514 06:59 AM
HallsofIvy

1 
173 
I have a linear timevarying linearly perturbed ODE of the form:
\dot{x} = x
where A(t) is a bounded...

Sep314 04:33 PM
dmytro

1 
135 
Im writing a program that calculates the trajectory of a particle in an arbitrary force field.
the force field is a...

Sep314 02:39 PM
bluntwcrackrap

5 
334 
I want to model a Differential Equation for a projectile motion under 2 forces (gravity and wind)
So, what I have...

Sep314 01:08 PM
Feeh

2 
218 
I am learning how to solve 1st order linear ODEs using the integrating factor.However, I run into confusion at the...

Sep314 08:08 AM
HallsofIvy

4 
178 
I had a brief question regarding SDEs. Typically, I've seen models like the OrnsteinUhlenbeck process that generally...

Sep314 12:22 AM
Apogee

6 
181 
Firstly, if this is an inappropriate forum for this thread, feel free to move it. This is a calculusy equation...

Sep214 10:13 PM
jasonRF

2 
230 
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 
239 
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 
195 
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 
515 
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 
2,132 
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 
1,353 
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 
270 
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 
263 
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 
337 
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 
201 
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 
391 
Hi, while solving differential equations problems we have to sometimes use absolute value while
taking an integral of...

Aug1314 11:30 AM
HallsofIvy

3 
279 
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 
388 
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 
298 