# Blaschke-Weyl formula

(Redirected from Blaschke–Weyl formula)
A variant of the Green formulas for the rotation field $y$ of an infinitesimal deformation of a surface with position vector $\mathbf x$:
$$2 {\int\limits \int\limits } _ { G } \left ( \mathbf x \frac{\partial \mathbf y }{\partial u } \frac{\partial \mathbf y }{\partial v } \right ) du dv = \ \oint _ {\partial G } ( \mathbf x\mathbf y d \mathbf y ) .$$