Volume formula for a Z2\mathbb{Z}_2-symmetric spherical tetrahedron through its edge lengths

preprint2011arXivOpen access

Abstract

The present paper considers volume formulae, as well as trigonometric identities, that hold for a tetrahedron in 3-dimensional spherical space of constant sectional curvature +1. The tetrahedron possesses a certain symmetry: namely rotation through angle ππ in the middle points of a certain pair of its skew edges.

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