Semi - symmetric spacelike hypersurfaces in de sitter space 空间中半对称的类空超曲面
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A simple undirected graph is said to be semisymmetric if it is regular and edge - transitive but not vertex - transitive . this thesis consists of two parts 如果一个简单的无向图是正则的,边传递但不是点传递的,那么称它是半对称的。