quadratic differential
a section of the symmetric square of the holomorphic cotangent bundle; the vector space of holomorphic quadratic differentials on a Riemann surface is naturally isomorphic to the cotangent space to the Teichmüller space
a section of the symmetric square of the holomorphic cotangent bundle; the vector space of holomorphic quadratic differentials on a Riemann surface is naturally isomorphic to the cotangent space to the Teichmüller space