Question

For separable partial differential equations, how do you know when to use the three different cases (the term multiplied by X or Y is zero, positive, or negative)? I looked at my solution guide and some problems require no cases, some require only the one case where the middle term multiplied by X or Y is zero, and the rest require all three cases.

Answer 1

hey can u tell me one thing?
Is star stays at the moon or moon stays at the star?

Answer 2

Yes.

Answer 3

tell me :)

Answer 4

Moon is star.

Answer 5

You are genius :)

Answer 6

I'm glad I could answer your question in my question.

Answer 7

Glad me too :)

Answer 8

Any ideas, Kainui? :)

Answer 9

I don't really understand what you're asking.
Do you have an example problem maybe? D:

Answer 10

The formatting on this site is kind of wonky. I took a screenshot of a more detailed version of my question in better formatting: http://i.imgur.com/1qvnVec.png

Answer 11

Mmm darn I can't remember PDE's very well :c

Answer 12

Was a really fun class though.

Answer 13

Pretty tedious though.

Answer 14

Just scratching the surface of PDE's. We've done ODE's the whole semester. I'm guessing PDE's are much more difficult.