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Differential Equations

- An equation involving derivatives of a function or functions. Solving ODE and PDE
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My intent is to create a thread for people interested in Differential Equations. However, I will explicitly state that...
Jul3-12 07:18 PM
Luccas
95 121,364
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:24 AM
micromass
1 25,890
I think my lack of background in proofs is showing. From "Partial Differential Equations of Mathematical Physics...
Mar28-04 08:32 PM
cookiemonster
11 2,245
Although on the whole my Boyce & DiPrima book is fairly good in of itself and compared with others, but of-coarse some...
Feb14-08 06:39 PM
bowzerman
11 2,404
hi all... i need to solve this differential equation of 2nd order...if anyone could tell me the way or method to...
Apr18-04 11:16 AM
Max0526
11 1,972
Solve the difference equation yn+1=(n+1)/(n+2) yn in terms of the initial value y0.
Jul21-13 08:00 AM
HallsofIvy
11 836
hi how do u find the laplace of the function below: x'(t) = kx(t) -hH(44-t) k is the rate which is >0, x(t) is...
May19-04 06:30 PM
angel
11 1,522
It looks simple enough: y'' + x*y = x^2 However, I tried and I could not find a nontrivial solution to the...
Jun30-04 09:18 PM
heardie
11 2,178
somebody slove this differential equations 1/y' = (1/y)+(1/x) thanx in advance
Dec13-04 01:24 PM
Nylex
11 1,824
I need help finding a linear homogenous constant-coefficient differential equation with the given general solution. ...
May16-13 07:52 PM
Mark44
11 781
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 ...
Mar26-05 01:57 PM
athanatos
11 1,810
I'm attempting to help someone with their diff eq homework and I'm having trouble remembeing how to do things and...
Apr19-05 06:37 AM
saltydog
11 3,039
A dart is shot straight up from 1.5m above ground level. The distance d, in meters, the dart is above ground at time...
May25-05 03:23 PM
arildno
11 1,190
Q1 :For example Solve the D.E : U''-2xU' +2u = 0 Do I write out the series solution or write somthing like : C1e^r1...
Aug26-05 05:50 PM
saltydog
11 1,502
Hi, What do you think about the possible (nontrivial) solutions of this equation ? (1) f '(x) = f(x-1) (f is a...
Jan23-06 04:21 PM
saltydog
11 2,149
Hey, I've been teaching myself some DEs that I can use for physics and whatnot. I am comfertable with seperable...
Nov23-06 11:44 PM
crepincdotcom
11 2,481
hi guys, I'm solving a pretty complex problem: calculating a trajectory of a charged particle in a custom magnetic...
Sep13-07 12:46 PM
Matthew Rodman
11 2,577
I was curious about finding the velocity function for a free-falling object using solely newton's equations. Using the...
Sep14-08 09:08 AM
pbecker314
11 17,147
Iím stacked with this problem for many days, someone can help me pleeeeease: (a) f \left( x \right) =\int _{-\infty...
Mar22-08 10:23 AM
D H
11 4,678
Hello, I have the 2nd-order nonlinear ODE below: k(v)=\frac{\phi ''(v)}{\phi (v) (\phi ' ^2 (v) +1)^2} ...
Sep14-08 09:05 PM
smallphi
11 2,048
Hi all, I've been musing on a problem I came across whilst decanting some sloe gin (that time of the year here in...
Nov29-08 03:43 PM
bomanfishwow
11 1,295
how to solve dy/dx=3√(xy) for a general solution? PS: √ is square root sign, just in case if it is not clear. ...
Mar9-09 07:14 AM
csprof2000
11 9,062
Hey all, I'm really having a hard time figuring out a couple of problems in which I have to differentiate: 1: ...
Apr15-09 08:14 AM
tiny-tim
11 4,266
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...
Aug10-09 04:15 PM
Tac-Tics
11 2,477
Please if anyone can help me to solve this differential equation.
Mar25-12 01:42 PM
artan
11 1,626
What is the use of Laplace transforms in differential equations? I mean, why are they used? And can you please...
Jul20-12 02:57 PM
Jonnyb302
11 3,107
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,...
Jul16-12 08:47 PM
Marioeden
11 1,156
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...
Jul15-12 10:04 PM
ericm1234
11 1,553
I have to derive equations of motion from Lagrangian and stumbled upon the following system of equations (constants...
Dec1-12 10:36 AM
arildno
11 1,403
I am intending to use Runge Kutta 4th order to numerically solve a system of coupled equations: ...
Feb14-13 08:56 AM
strokebow
11 1,395
I've come across this problem while self studying Ordinary Differential Equations and I really need help. The problem...
Dec23-13 10:51 AM
vanceEE
11 777
Hello. Do any of you have any good books on DE? Because I was really disappointed with my Calculus book. It had plenty...
Mar27-04 10:26 AM
H-bar None
10 3,633
I'm finding this diff equation hard y'' + \ln{y} = yx How do I solve it?
Dec4-04 10:57 AM
arildno
10 2,006
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...
Feb9-05 10:38 PM
mathwonk
10 17,396
Suppose we have y'' = f(t, y); y(a) = y0; y'(a) = y0' Note all derivatives are with respect to t. Let u = y',...
Apr24-05 01:14 PM
eckiller
10 2,178
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...
Apr28-05 02:02 PM
James Jackson
10 3,149
y = (4-x) ^ 5x Just wondering what i should do with this Thanx
May15-05 09:07 AM
abia ubong
10 1,089
Another DE problem i've encoutered... A contagious disease spreads at a rate directly proportional to the product...
Jul2-05 07:58 AM
kanki
10 1,559
Hi all, I'm new here. I stumbled upon the site while searching for solutions to nonlinear differential solution. ...
Jul18-05 02:37 AM
kank_39
10 1,387
An eariler post by Kank concerned a special case of the general elliptic equation: y^{''}=A+By+Cy^2+Dy^3 This...
Jul20-05 01:20 PM
saltydog
10 2,907
How to solve the differential equation dy/dx=xy+y^2 In my case this leads to an integral which is unsolvable!...
Aug22-05 09:46 AM
heman
10 1,464
Need some help. I studied math a million years ago and my boss thinks I still remember anything about diff EQ besides...
Sep22-05 01:51 PM
audcrane
10 2,112

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