Possible Duplicate:
Separate long math text under sum symbol into different lines?
I'm interested in typesetting the following double-limit:

Possible Duplicate:
Separate long math text under sum symbol into different lines?
I'm interested in typesetting the following double-limit:

\[\lim_{\substack{x\rightarrow0\\y\rightarrow0}}x^y=1\]– Werner Nov 08 '11 at 20:16