# Math Help - Chain rule for functions of two independent variables.

1. ## Chain rule for functions of two independent variables.

is the theorem 5 attached in pic valid if partial derivatives w.r.t x and y are discontinuous.

2. ## Re: Chain rule for functions of two independent variables.

Originally Posted by saransh
is the theorem 5 attached in pic valid if partial derivatives w.r.t x and y are discontinuous.
Your question is already answered in the statement of the theorem since it states the conditions under which it is valid!

3. ## Re: Chain rule for functions of two independent variables.

can anybody give an example of a non differentiable function where the theoram is invalid