【摘要】 罗氏空间中每一四面体有唯一的外接球曲面及旁切球曲面．本文还讨论了此外接球曲面与四面体各面上的三角形的外接圆曲线的关系更多还原

【Abstract】 Every tetrahedron in Lobachevsky’s space has a unique circumscribed hypersphereand escribed hypersphere. The paper also discusses the relation between the circumscribed hypersphere and circumscribed hypercircles of the triangles on the faces of the tetrahedron.更多还原