
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 
138,495 
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:24 AM
micromass

1 
30,172 
I think my lack of background in proofs is showing.
From "Partial Differential Equations of Mathematical Physics...

Mar2804 08:32 PM
cookiemonster

11 
2,336 
Although on the whole my Boyce & DiPrima book is fairly good in of itself and compared with others, but ofcoarse some...

Feb1408 06:39 PM
bowzerman

11 
2,445 
hi all...
i need to solve this differential equation of 2nd order...if anyone could tell me the way or method to...

Apr1804 11:16 AM
Max0526

11 
2,103 
Solve the difference equation yn+1=(n+1)/(n+2) yn in terms of the initial value y0.

Jul2113 08:00 AM
HallsofIvy

11 
1,122 
hi how do u find the laplace of the function below:
x'(t) = kx(t) hH(44t)
k is the rate which is >0, x(t) is...

May1904 06:30 PM
angel

11 
1,637 
It looks simple enough:
y'' + x*y = x^2
However, I tried and I could not find a nontrivial solution to the...

Jun3004 09:18 PM
heardie

11 
2,234 
somebody slove this differential equations
1/y' = (1/y)+(1/x)
thanx in advance

Dec1304 01:24 PM
Nylex

11 
1,859 
I need help finding a linear homogenous constantcoefficient differential equation with the given general solution.
...

May1613 07:52 PM
Mark44

11 
988 
need to solve the following beam equation:
p(x)\frac{d^2\w}{dx^2}a\frac{d^4\w}{dx^4}b\frac{d^2\w}{dt^2}=0
...

Mar2605 01:57 PM
athanatos

11 
1,874 
I'm attempting to help someone with their diff eq homework and I'm having trouble remembeing how to do things and...

Apr1905 06:37 AM
saltydog

11 
3,121 
A dart is shot straight up from 1.5m above ground level. The distance d,
in meters, the dart is above ground at time...

May2505 03:23 PM
arildno

11 
1,221 
Hello
I'm struggling with this concept, cant seem to get my head round it or find any good reference sites or books....

Jun1410 11:20 PM
ross_tang

11 
21,230 
Q1 :For example
Solve the D.E : U''2xU' +2u = 0
Do I write out the series solution or write somthing like : C1e^r1...

Aug2605 05:50 PM
saltydog

11 
1,565 
Hi,
What do you think about the possible (nontrivial) solutions of this equation ?
(1) f '(x) = f(x1) (f is a...

Jan2306 04:21 PM
saltydog

11 
2,291 
Hey,
I've been teaching myself some DEs that I can use for physics and whatnot. I am comfertable with seperable...

Nov2306 11:44 PM
crepincdotcom

11 
2,586 
hi guys,
I'm solving a pretty complex problem: calculating a trajectory of a charged particle in a custom magnetic...

Sep1307 12:46 PM
Matthew Rodman

11 
2,668 
I was curious about finding the velocity function for a freefalling object using solely newton's equations. Using the...

Sep1408 09:08 AM
pbecker314

11 
17,511 
I’m stacked with this problem for many days, someone can help me pleeeeease:
(a) f \left( x \right) =\int _{\infty...

Mar2208 10:23 AM
D H

11 
4,871 
Hello,
I have the 2ndorder nonlinear ODE below:
k(v)=\frac{\phi ''(v)}{\phi (v) (\phi ' ^2 (v) +1)^2}
...

Sep1408 09:05 PM
smallphi

11 
2,125 
Hi all,
I've been musing on a problem I came across whilst decanting some sloe gin (that time of the year here in...

Nov2908 03:43 PM
bomanfishwow

11 
1,382 
Hello! I got one question for you.
How come that (f \circ g)'(x) = f'(g(x)) g'(x) ?
Since (f \circ...

Aug1011 12:25 AM
dimension10

11 
6,337 
how to solve dy/dx=3√(xy) for a general solution?
PS: √ is square root sign, just in case if it is not clear.
...

Mar909 07:14 AM
csprof2000

11 
9,808 
Hey all, I'm really having a hard time figuring out a couple of problems in which I have to differentiate:
1: ...

Apr1509 08:14 AM
tinytim

11 
4,445 
Hello I got one question. I am confused by seeing dx in front of the integral.
For ex.
\int f(x) dx = F(x) + C...

Aug1009 04:15 PM
TacTics

11 
2,638 
Hi 2 all
Necessary i need ode that's have no general sol nd I need also an ode thats i can solve it with more way ...

Oct1610 07:22 AM
JaredJames

11 
1,523 
Hi,
I have a differential equation that I just can't seem to solve. Now here's the deal: I'm sure there are...

Sep2511 08:25 AM
sgtkt

11 
3,594 
Hello all,
I don't have much experience with ODEs.
I have a simple system, which I believe is first order linear,...

Jun2211 11:36 AM
mykat

11 
1,278 
Greetings,
I want to find the characteristics of the following parabolic PDE
u_t + v u_x + w u_y + a(t, x,y,v,w,...

Jul3011 09:22 AM
Tohiko

11 
2,419 
I'm having some problems recognizing duplication when using the undetermined coefficients method to solve homogeneous...

Nov311 06:21 PM
S_Happens

11 
3,161 
Newton's universal law of gravitation:
F=G \frac{m_1 m_2}{r^2}
I'd like to set up the problem so the particle...

Nov1511 07:27 AM
JDoolin

11 
2,853 
Hi everyone, I'm currently learning about finiteelement methods and I'm having trouble understanding the motivation...

Mar1412 02:38 PM
bigfooted

11 
2,329 
Please if anyone can help me to solve this differential equation.

Mar2512 01:42 PM
artan

11 
1,703 
Solve:
Δu=1, u(1, theta)=sin(theta). 0<r<1, pie<theta<pie, u finite at r=0
What I've done: u=u1+u2. Δu2=0,...

Jul1612 08:47 PM
Marioeden

11 
1,277 
xy''+y'=x
y(1)=0, y(0) bounded (so the natural log, 1/x etc. terms drop out)
homogeneous, cauchy euler: y=a+bx...

Jul1512 10:04 PM
ericm1234

11 
1,722 
I've come across this problem while self studying Ordinary Differential Equations and I really need help. The problem...

Dec2313 10:51 AM
vanceEE

11 
1,015 
Hello. Do any of you have any good books on DE? Because I was really disappointed with my Calculus book. It had plenty...

Mar2704 10:26 AM
Hbar None

10 
3,838 
I'm finding this diff equation hard
y'' + \ln{y} = yx
How do I solve it?

Dec404 10:57 AM
arildno

10 
2,063 
what are some of the best intros to ODEs? also, has anyone read any of the Dover books on ODEs and know which one is...

Feb905 10:38 PM
mathwonk

10 
20,674 
Suppose we have y'' = f(t, y); y(a) = y0; y'(a) = y0'
Note all derivatives are with respect to t.
Let u = y',...

Apr2405 01:14 PM
eckiller

10 
2,242 
I have a test in Diff Eq. tommorow and part of the test is inovling the Dirac Delta function. I have no clue as to...

Apr2805 02:02 PM
James Jackson

10 
3,237 