Algebraic Entropies, Hopficity and co-Hopficity of Direct Sums of Abelian Groups

Authors

Brendan Goldsmith, Technological University DublinFollow
Katao Kong, Hubei Engineering University

Document Type

Article

Disciplines

1.1 MATHEMATICS

Publication Details

Topological Algebra and Its Applications

Abstract

Necessary and sufficient conditions to ensure that the direct sum of two Abelian groups with zero entropy is again of zero entropy are still unknown; interestingly the same problem is also unresolved for direct sums of Hopfian and co-Hopfian groups. We obtain sufficient conditions in some situations by placing restrictions on the homomorphisms between the groups. There are clear similarities between the various cases but there is not a simple duality involved.

DOI

https://doi.org/10.1515/taa-2015-0007

Recommended Citation

Goldsmith, B. & Kong, G. (2019). Algebraic entropies, Hopficity and co-Hopficity of direct sums of Abelian Groups. Topological Algebra and its Applications, 3(1). DOI 10.1515/taa-2015-0007

Creative Commons License

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