Is there a convenient sufficient condition for knowing whether a function of two variables is differentiable? Isn't it something like if both the partial derivatives exist and are continuous, you know the derivative [itex]\mathbf{D}f[/itex] exists?(adsbygoogle = window.adsbygoogle || []).push({});

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Sufficient condition for differentiability of a function of two variables

**Physics Forums | Science Articles, Homework Help, Discussion**