Abstract
Let G be a discrete group. It is well known that the (co)homology groups of G have both topological and algebraic definitions. Now, consider a subgroup H of G. In the literature, there are two versions of relative (co)homology groups for the pair (G, H), one generalises in a natural way the topological definition, while the other one generalises in a natural way the algebraic definition. In this article, we give a topological definition for the latter one, we give simple examples that show that these theories do not coincide in general, and we give a sufficient condition on the subgroup H in order that both relative group (co)homologies of the pair (G, H) coincide.
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Acknowledgments
We thank Professor Francisco González Acuña for fruitful discussions. J. L. Cisneros-Molina thanks Galatasaray University and Nesin Mathematics Village, both in Turkey, for their hospitality during part of the writing of this article. We thank the referee for his/her careful reading of the manuscript and for many suggestions to improve this article.
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On memory of Sam Gitler.
Research supported by projects UNAM-DGAPA-PAPIIT IN106614 and CONACYT 253506. Part of J. A. Arciniega-Nevárez’s Ph.D. thesis [3]. J. L. Cisneros-Molina is Regular Associate of the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy.
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Arciniega-Nevárez, J.A., Cisneros-Molina, J.L. Comparison of relative group (co)homologies. Bol. Soc. Mat. Mex. 23, 41–74 (2017). https://doi.org/10.1007/s40590-016-0149-z
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DOI: https://doi.org/10.1007/s40590-016-0149-z