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

Feb2313 09:24 AM
micromass

1 
25,829 
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 
121,180 
why is a_{11} dy^2  2a_{12} dxdy + a_{22} dx^2 = 0 the characteristic equation of a_{11} \phi _x^2 + 2a_{12} \phi...

Nov2710 06:09 AM
kakarotyjn

0 
702 
Hey Guys.
Im trying to find an inverse laplace transform for fraction in the laplace domain but cant find it in any...

Nov2610 09:23 AM
HallsofIvy

2 
941 
I can not how define way to solve these equation
x(lx)y''+4y'+2y=o
If any one can help

Nov2610 09:21 AM
HallsofIvy

4 
1,207 
Hello,
Thanks at first. If anyone can understand, then I would like to know how do I get to equation 4.15. Its a...

Nov2610 09:10 AM
hgfalling

3 
951 
I was asked to seek for a harmonic function u(x,y) in the 2dimention disk whoes boundry condition is...

Nov2610 03:26 AM
JJacquelin

1 
1,123 
x^2 y'' + x y' + n^2 y = 0 \; Is Euler equation and solution is y=x^m
I understand the three cases with different...

Nov2410 09:30 AM
HallsofIvy

4 
1,505 
Find the Particular Solution. Show the steps of derivation, beginning w/ the general solution....

Nov2310 12:10 PM
Matthew Rodman

1 
1,004 
y''+9y=sin(3t)
I need to solve the above using the method of undetermined coefficients.
I have already found the...

Nov2310 11:11 AM
phantomcow2

4 
2,546 
Problem:
y'+2y=4(x+1)2 > y=5e2x+2x2+2x+1
1. What the Order of the ODE?
It's 1st order
2 How do you check...

Nov2310 09:27 AM
eskie

7 
2,332 
Hey everyone. I'm trying to refresh myself of solving linear ODEs. For simplicity's sake, I began by trying to solve...

Nov2310 02:24 AM
arenaninja

2 
1,227 
The equation of motion of a rocket with mass depletion during ascent and subject to drag forces can be written as
...

Nov2210 01:57 PM
Rruffpaw

7 
2,651 
I have an ellipse of a rl circuit and a rc circuit but now i am confused on how to obtain the phase angle.
i know...

Nov2110 02:51 PM
noname1

0 
1,867 
Hello,
Sfunction! in Simulink/Matlab
does anyone solve ODE in Sfunction! in Simulink C++ blocks instead of...

Nov1810 12:05 PM
mbolhi

0 
2,036 
Hi,
Could someone please show me how to solve the following simple problem using the RungeKutta (RK4) integration...

Nov1810 08:54 AM
HallsofIvy

3 
1,918 
Hello,
My course is a bit vague on this topic.
1 First of all it states: if the differential equation A(x)y''(x)...

Nov1810 08:03 AM
HallsofIvy

1 
2,030 
Hi,
My differential equations professor wanted us to think about this problem:
How would you go about modeling...

Nov1610 09:01 AM
jambaugh

2 
2,255 
Hi there, I am a young mathematician and I have discovered that Dirichlet's boundary problem is ill posed... Anyone...

Nov1510 04:06 PM
arildno

1 
1,676 
Hello
I'm trying to solve the following DGL with an integrating factor:
x'=xg(y)
y'=yh(x)
which is...

Nov1310 10:44 AM
heinerL

1 
1,224 
dx/dt= x+y
dy/dt= 2x
x(0)=0
y(0)=1
I'm not familiar how to solve a system like this. Somebody plz help?
...

Nov1210 11:09 PM
maverick280857

8 
2,245 
I am considering a second order ODE of the form y''(x) + f(x) y(x) = 0, with boundary conditions that y(x) = 0 at...

Nov1210 10:16 AM
mordechai9

0 
2,220 
The initial mass of fish in a lake was 7 thousand pounds on January 1st, 2001. Since the time, there was a 4year...

Nov1210 06:44 AM
HallsofIvy

1 
1,187 
yIII+yIIyIy = 0
I used the characteristic equation and got:
r3+r2r = 0
r (r2+r1) = 0
Which means that...

Nov1210 06:29 AM
HallsofIvy

1 
13,336 
Hello everybody,
could you please direct me how to solve this nonlinear differential equation analytically, so by...

Nov1110 10:38 PM
Dickfore

20 
3,647 
I have the following elliptic equation that I must solve:
a\frac{\partial^{2}\phi}{\partial...

Nov1110 03:54 PM
fzero

7 
1,064 
Hi everyone,
This is more of a numerical question but I felt this would be the most appropriate forum. I apologise...

Nov1110 04:02 AM
pamparana

0 
1,573 
Here is the equation I don't know how to solve:
\begin{aligned}
\left( {\frac{{{{\rm{d}}^2}}}{{{\rm{d}}{t^2}}} +...

Nov1110 12:51 AM
swraman

1 
1,973 
function dy = prob_52 (t,y)
dy = cos(y)  (sin (t)*y);
= ode45 (@prob_52,,0)
plot (t,y)
xlabel ('Time')
ylabel...

Nov1110 12:45 AM
swraman

4 
4,903 
I have problem in solving following DAE's:
1. 0 = X*U1*C4+X*U2*C4  1
2. Re*C1*(U1+U2)*U1'...

Nov1010 05:08 PM
oby7842

4 
3,698 
I know how to do Frobenius on variable coefficient ODE's but only when the coefficients are powers of the independent...

Nov910 11:48 AM
LCKurtz

1 
1,608 
Hi everybody. Ive got kind of a problem solving the following problem, so really hope for some help. The task says:
...

Nov910 11:37 AM
LCKurtz

2 
1,282 
Hi,
I am a chemist with unfortunately too little experience with differential equations, and now I have a problem...

Nov810 05:39 PM
jackmell

8 
3,010 
Hi everyone.
I was asked to learn Euler's method by myself but I was really confused with this question. How can I...

Nov810 11:17 AM
hunt_mat

1 
1,983 
Consider cylindrical coordinates p = (x^2 + y^2)^.5 angle = arctan(y=x). Consider
your curve to be specified by...

Nov810 12:49 AM
Auburnman

2 
1,287 
I am looking through my course notes for mathematical physics, in preparation for the exam, and I've run into a...

Nov710 03:41 AM
JJacquelin

1 
2,117 
I was given three plots of solutions for a forced exponential diffeq: y'+1.85 y=0.7t^2
with starter values on y...

Nov610 09:55 PM
LCKurtz

1 
774 
Could someone please explain the y2 solution for repeated roots in Frobenius method where y2=y1lnx+xs \Sigma Cnxn
...

Nov610 10:55 AM
matematikawan

1 
2,410 
Hi, just like to check my answer with someone for the this question
calculate y"+9y=H(t1) y(0)=0 y'(0)=2 using...

Nov610 10:48 AM
matematikawan

1 
949 
Hi,
I need to solve the following simple ODE with both the Euler Forward and Euler Backward numerical methods. I...

Nov610 10:40 AM
matematikawan

15 
23,387 
I'm flipping through a math book to eventually be able to get to a fourier numerical solutions but the second chapter...

Nov610 09:22 AM
parkcman

0 
1,079 
I'm reading a book (Numerical Techniques in Electromagnetics by Sadiku) & just finished the section on finite...

Nov610 04:09 AM
apchar

0 
1,649 