👉 In mathematics, the Pfaffian is a function that measures the curvature of a curve or surface. It is named after Walter F. Pfaff, who first defined it in 1957. The Pfaffian of a curve (or surface) C on an oriented two-dimensional surface S is defined as: $$ \phi_{C,S} = \frac{D^2}{ds^2} $$ Where D is the differential operator for the surface. The Pf
