Question

Any good problem websites for differential equations?

Answer 1

in case you don't know about this one:
http://tutorial.math.lamar.edu/Classes/DE/DE.aspx

Answer 2

Of course, that was taken as a given. Any specifically aimed towards sets of problems, though?

Answer 3

Or is there a section of POMN that I'm overlooking?

Answer 4

I know POMN intends to add more practice problems
Aside from that, I would like to know as well.
There is, of course, the OCW diffeQ class, which you could just do the homework and exams from
http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/unit-i-first-order-differential-equations/exam-1/MIT18_03SCF11_prex1.pdf

http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/index.htm

still perhaps not exactly what you're looking for.

Answer 5

what topics are you looking for?

Answer 6

there is one hidden course at OCW
http://ocw.mit.edu/resources/res-18-008-calculus-revisited-complex-variables-differential-equations-and-linear-algebra-fall-2011/

Answer 7

Beginner to (lowish-)intermediate, but maybe I'm so much of a novice that I overestimate my level.

Answer 8

well if you can get through all of paul's notes then I think you can make a good attempt at some of the OCW stuff, though you may need to watch a few lectures to get the pro tips required for the particularly tricky problems

Answer 9

Paul notes is fine ... it's useful for me too.

Answer 10

Your problems look above me right now, but gaining the background knowledge to them them should be interesting.
Do you have any very basic (2nd order homogenuous is as far as I can comfortably do now) problems? I'll try POMN also.

Answer 11

try getting a book ... exercises are essential for math. try solving problems from MIT OCW course materials.

Answer 12

here are some fairly gentle, constant-coefficient 2nd order homogeneous DE's for you
http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/unit-ii-second-order-constant-coefficient-linear-equations/modes-and-the-characteristic-equation/MIT18_03SCF11_ps3_s12q.pdf

and here are the answers:
http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/unit-ii-second-order-constant-coefficient-linear-equations/modes-and-the-characteristic-equation/MIT18_03SCF11_ps3_s12s.pdf

Answer 13

again this is just from unit II of ocw
http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/unit-ii-second-order-constant-coefficient-linear-equations/modes-and-the-characteristic-equation/

Answer 14

download the whole course materials.

Answer 15

http://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/download-course-materials/

Answer 16

^yeah, that is really the best way to go; do everything from the beginning so you know the MIT way of thinking about the problems.

Answer 17

if you do that whole course .. you'll probably get ahead of me.

Answer 18

OK, thanks for all that. I know in theory I could have found all that by myself, but I'm lazy...

Answer 19

I haven't done the whole multivariable course yet even... I'm lazy too

Answer 20

I tend to rote learn more with reading POMN than MIT video lectures, so I'll do that as the main thing.

Answer 21

every one is lazy ... think of me as another one too.