# find point which this function is differentiable

Printable View

• December 2nd 2008, 12:20 PM
silversand
find point which this function is differentiable
$f(x,y)=xy|x-y| , \ \ \ x,y\in R$
• December 2nd 2008, 12:58 PM
vincisonfire
Along x=y, the function is not differentiable.
It correspond to the "apex line" of the absolute value part.