http://img40.imageshack.us/img40/39/20688555.gif

Show that the limit as (x,y) -> 0 doesn't exist.

Attempt:

To prove it, I must use thedefinitionof limit (the epsilon and delta thing).

Well, if the limit exists, and is 1, given any we can find a such that if

perhaps we can ty

I'm not sure how to complete this proof to conclude that doesn't exist... some help with this is very much appreciated.