Abstract
The goal of this paper is to give some theorems which relate to the problem of classifying combinatorial (resp. smooth) closed 5-manifolds up to piecewise-linear (PL) homeomorphism. For this, we use the combinatorial approach to the topology of PL manifolds by means of a special kind of edge-colored graphs, called crystallizations. Within this representation theory, Bracho and Montejano introduced in 1987 a nonnegative numerical invariant, called the reduced complexity, for any closed n-dimensional PL manifold. Here we obtain the complete classification of all closed connected smooth 5-manifolds of reduced complexity less than or equal to 20. In particular, this gives a combinatorial characterization of \(\mathbb {S}^2 \times \mathbb {S}^3\) among closed connected spin PL 5-manifolds.
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Acknowledgements
This work was performed under the auspices of the “National Group for Algebraic and Geometric Structures, and their Applications” of the GNSAGA-INDAM within the CNR (National Research Council) of Italy and partially supported by the MIUR (Ministero dell’Istruzione, dell’Università e della Ricerca) of Italy within the project “Strutture Geometriche, Combinatoria e loro Applicazioni”. We should like to thank the Managing Editor of the journal, Professor András I. Stipsicz and three anonymous referees for their useful comments and suggestions improving the original version of the paper.
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Cavicchioli, A., Spaggiari, F. On reduced complexity of closed piecewise linear 5-manifolds. Period Math Hung 83, 144–158 (2021). https://doi.org/10.1007/s10998-020-00375-6
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DOI: https://doi.org/10.1007/s10998-020-00375-6
Keywords
- Combinatorial 5-manifolds
- Edge-colored graphs
- Crystallization
- Complexity
- Classification
- Poincaré conjecture
- Homology
- Handles
- Surgery