# Revision history [back]

f(x,y) = f

so that Sage knows it is a function of two variables; your syntax can't work because f(x,y) doesn't work from the input box this way.
f(x,y) = f

so that Sage knows it is a function of two variables; your syntax can't work because f(x,y) doesn't work from the input box this way.way. Here is a live example.