mathematical study of the differential geometry of surfaces, the Bertrand–Diguet–Puiseux theorem expresses the Gaussian curvature of a surface in terms of the...

Gaussian curvature K at the point P can be computed by the Bertrand–Diguet–Puiseux theorem as K = lim r → 0 + 3 ( 2 π r − C ( r ) π r 3 ) . {\displaystyle...