Let be a regular surface with points in the tangent space of . Then the third fundamental form is given by
where is the shape operator.
Let be a regular surface with points in the tangent space of . Then the third fundamental form is given by
where is the shape operator.
Weisstein, Eric W. "Third Fundamental Form." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ThirdFundamentalForm.html