Hopficity of negatively curved polygonal amalgams of finite groups
A polygonal amalgam of groups is the direct limit of polygonal diagrams of groups satisfying some natural conditions. This construction is the 2- dimensional analog of amalgamated free products. In a previous paper the author studied the automorphism structure of certain negatively curved polygonal amalgams. Here he extends the tools of that paper to study endomorphisms of negatively curved polygonal amalgams of finite groups. In particular he shows such groups are Hopfian.
scientific article; zbMATH DE number 626262