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# PDE watch

1. Hi was just wondering whether I could have any help in solving this PDE:

d^2u(x,y)/dxdy=0

Can you find all solutions u(x,y) to this equation?

I know this is pretty simple (concerning all PDE questions), however I'm just getting stuck on the separation of variables for some reason!

Any help would be truly appreciated!!
2. I don't see an equation...

An equation is a sentence of the form:

something = something else

I just see a 'something' in your post.
3. sorry, missed out the =0 my fault.
4. Look up the wave equation. This is the simplest form of that. There isn't really much to do, just integrate twice to get the general solution
u(x,y) = X(x) + Y(y).

You were probably overthinking it.

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Updated: April 18, 2013
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