Holomorphy Angles and Sectional Curvature in Hermitian Elliptic Planes Over Fields and Tensor Products of Fields


Holomorphy angles and sectional curvature in Hermitian elliptic planes over field $C$ of complex numbers, skew field $H$ of quaternions, and alternative skew field $O$ of octonions are considered, and analogues of holomorphy angles in planes over tensor products of these fields and sectional curvature in these planes are found.