
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 
138,205 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
30,053 
Hiya. I have to solve this bad boy under the assumptions that f, f' and f'' tend to 0 as x tends to infinity:
...

Nov512 12:59 AM
JJacquelin

1 
763 
μ^{2}\frac{d^{2}u}{dx^{2}}+ae^{u}=0
Boundary conditions: u(L)=u(L)=u_{0}
Solve by multiplying by \frac{du}{dx}...

Nov512 01:32 AM
JJacquelin

2 
1,094 
Hello
I know nothing about differential equations, can you explain them to me in a few simple words?
And what's...

Nov112 05:48 PM
djpailo

33 
4,015 
dε/dt=d(uε)/dZ+
where ε=% area opening, u= velocity, Z=length , k1, k2= constants, t= time
Please help me how...

Oct1612 07:12 AM
Chestermiller

5 
1,476 
THE PROBLEM :
y(t) = e^(t)*sin(t^2);
with t0 = 0 and T = 3.14159. Find y_0, and use it to deduce the...

Oct1412 07:22 PM
X89codered89X

5 
1,500 
Hi,
I was wondering if you can apply shooting method to a 4nd differential eq.
two point value boundary problem,
...

Oct1712 10:23 PM
Chestermiller

2 
1,136 
Hi,
I am undertaking an undergrad design project and want to ensure I'm doing this correctly,
I have derived the...

Oct2012 01:40 PM
X89codered89X

1 
833 
Hi. I'm watching this video and I don't know what the lecturer is saying.
In this video, he says something like...

Oct1412 10:27 PM
OmCheeto

1 
1,163 
Suppose I have a really simple first order linear ODE like:$$\dot{\omega} = k\omega$$ where k is some constant, ω(t)...

Oct1512 07:38 PM
cepheid

2 
1,074 
Hello, I have recently started a little implicit differentiation and I have seen DEs before but I know that I still...

Oct1712 08:49 AM
Mute

1 
1,531 
Hi! I am currently working with a linear PDE on the form
\frac{\partial f}{\partial t} + A(v^2 ...

Oct2112 06:32 PM
sith

5 
1,225 
Does it have an easy classification (elliptic, hyperbolic, parabolic, for example)? Or does the fact that it has an...

Oct1912 04:24 PM
Mute

1 
1,134 
All,
I have a system of three coupled PDE and I discretized the equations using finite difference method.
It...

Oct2012 05:29 PM
FrankST

2 
1,010 
Hi everybody,
For part of my research, I need to solve an elliptic PDE like:
Δu  k * u = 0,
subject to : 0≤...

Oct2012 10:32 PM
haruspex

5 
811 
After a short look on the question formulated in this differential equation forum I came to the conclusion that the...

Oct2412 08:03 PM
Unstable

8 
1,602 
Hi there,
This is a problem concerning hyperbolic type partial differential equations. Currently I am studying the...

Oct2312 01:40 AM
OneMoreName

3 
1,671 
I have a doubt in finding out the Particular Integral of eaxV, where 'V' is a function of x.
I saw the book but...

Oct2312 10:51 PM
iVenky

4 
1,041 
Consider a circle of radius 'a' and centre (h,b)
then the equation of the circle is given by (xh)2 + (yb)2 = a2
...

Oct2312 05:12 PM
Chestermiller

4 
1,911 
Actually I can't find if a differential equation is homogeneous or not
I thought homogeneous is given by
dy/dx=...

Oct2212 01:35 PM
Vargo

1 
862 
Hey,
I've been trying to run a few simulations in Matlab using ODE45. This algorithm requires a function which...

Nov112 05:57 PM
djpailo

1 
1,092 
I was wondering if someone can show me or point me to a worked out example using integration by parts for more than...

Oct2212 10:19 PM
ericm1234

0 
878 
I was recently trying to prove the variation of parameters formula for an nth degree equation, and I have come up with...

Oct2312 08:07 AM
HallsofIvy

1 
1,261 
Hello there,
I want to solve the heat PDE in a 1D domain for a source moving at constant speed. The problem has...

Oct2312 10:57 AM
muzialis

4 
1,236 
Hello every one. I'm doing research related to heat transfer stuff. I came up with this PDE after making some...

Oct2412 10:36 PM
p.sarafraz

4 
2,560 
I can prove that the particular integral of sin(ax+b) is given by
\frac{1}{f(a^{2})} sin(ax+b)
That's not an...

Oct2412 10:10 PM
iVenky

2 
1,305 
Here's the proof that I read for method of variation of parameters
...

Oct2412 09:04 AM
iVenky

4 
2,818 
I just don't get why the method of undetermined coefficients can't be applied to tan(x) and sec(x). What my book says...

Oct2812 02:28 AM
lurflurf

5 
1,671 
The Cauchy homogeneous linear differential equation is given by
x^{n}\frac{d^{n}y}{dx^{n}} +k_{1}...

Oct2612 02:45 PM
HallsofIvy

7 
2,810 
Mod note: HTML size = ... tags are not needed. You can make things look just fine using tags instead of tags.
So,...

Oct2412 11:20 PM
LCKurtz

20 
1,664 
Hey I am in physics 30 and i am having trouble rearraging this eqaution: d=vt+1/2at^2
V= velocity 1
a=...

Oct2412 04:58 PM
kimberlycc

2 
1,225 
Hi guys!
I had the following system of DE's to solve:
\alpha '=2i \alpha
\beta ' =2i \beta.
Where alpha and beta...

Oct2512 12:33 AM
chiro

2 
1,414 
Hello,
First post. I will attempt to use latex, something that involves me jabbing my keyboard with a pen since my...

Oct2512 09:36 PM
TehAdzMan

4 
1,318 
I was given the following equation to solve:
x^2*y'' + x*y' + k^2*x^2*y = 0
B.C. y'(0)=0, y(1)=0
where k is...

Nov212 11:47 PM
haruspex

5 
1,444 
Let's say we have an object falling through an accelerated field from r to s. I would say a gravitational field, as it...

Oct2512 05:17 PM
gravuniverse

0 
727 
f is a one to one function with inverse f^1, and we are asked to find the inverse of s(x)=/
My attempts leave me...

Oct2912 11:45 AM
tinytim

9 
1,534 
Since the hurricane has killed school for awhile, I was working on some stuff that I knew we would not cover in class...

Oct2912 05:49 PM
dochalladay32

0 
2,720 
Hi!
I am tackling a pretty simple system of rate equations:
N1' = N1/t1 (1)
N2' = N2/t2 + N1/t1 ...

Oct3012 07:18 AM
JevKus

0 
836 
Hi,
I am in a numerical methods for PDE's class and have just been introduced to the ADI method. My teacher has...

Oct3012 07:15 PM
tlonster

0 
992 
I'm sorry this is going to sound kind of confusing and vague at first but stick with me! I remember a physicsforum...

Nov312 08:39 AM
HallsofIvy

1 
856 
I'm looking for the result that if omega is a connected domain, and u is a function in a sobolev space on omega for...

Nov612 08:38 AM
blinktx411

0 
821 