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Bulletin of the American Mathematical Society

The Bulletin publishes expository articles on contemporary mathematical research, written in a way that gives insight to mathematicians who may not be experts in the particular topic. The Bulletin also publishes reviews of selected books in mathematics and short articles in the Mathematical Perspectives section, both by invitation only.

ISSN 1088-9485 (online) ISSN 0273-0979 (print)

The 2020 MCQ for Bulletin of the American Mathematical Society is 0.84.

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A survey of the homology cobordism group
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by Oğuz Şavk
Bull. Amer. Math. Soc. 61 (2024), 119-157
DOI: https://doi.org/10.1090/bull/1806
Published electronically: October 6, 2023

Abstract:

In this survey, we present the most recent highlights from the study of the homology cobordism group, with particular emphasis on its long-standing and rich history in the context of smooth manifolds. Further, we list various results on its algebraic structure and discuss its crucial role in the development of low-dimensional topology. Also, we share a series of open problems about the behavior of homology $3$-spheres and the structure of $\Theta _{\mathbb {Z}}^3$. Finally, we briefly discuss the knot concordance group $\mathcal {C}$ and the rational homology cobordism group $\Theta _{\mathbb {Q}}^3$, focusing on their algebraic structures, relating them to $\Theta _{\mathbb {Z}}^3$, and highlighting several open problems. The appendix is a compilation of several constructions and presentations of homology $3$-spheres introduced by Brieskorn, Dehn, Gordon, Seifert, Siebenmann, and Waldhausen.
References
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Bibliographic Information
  • Oğuz Şavk
  • Affiliation: Department of Mathematics, Stanford University, Stanford, CA 94305, and Department of Mathematics, Boğaziçi University, Bebek, Istanbul 34342, Turkey
  • ORCID: 0000-0002-3022-0827
  • Email: oguzsavk@stanford.edu, oguz.savk@boun.edu.tr
  • Received by editor(s): September 26, 2022
  • Published electronically: October 6, 2023
  • © Copyright 2023 American Mathematical Society
  • Journal: Bull. Amer. Math. Soc. 61 (2024), 119-157
  • MSC (2020): Primary 57K31, 57K41, 57R57, 57R58, 57R90
  • DOI: https://doi.org/10.1090/bull/1806
  • MathSciNet review: 4678574