Displaying similar documents to “Torsion Free Subgroups of Fuchsian Groups and Tessalations of Surfaces.”

The nonseparability of simply presented mixed groups

Paul Hill, Charles K. Megibben (1998)

Commentationes Mathematicae Universitatis Carolinae

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It is demonstrated that an isotype subgroup of a simply presented abelian group can be simply presented without being a separable subgroup. In particular, the conjecture based on a variety of special cases that Warfield groups are absolutely separable is disproved.