Random Simplicial Complexes, Duality and The Critical Dimension

Autor:	Farber, Michael, Mead, Lewis, Nowik, Tahl
Rok vydání:	2019
Předmět:	Mathematics - Algebraic Topology Mathematics - Combinatorics 55-xx (Primary) 05-xx (Secondary)
Druh dokumentu:	Working Paper
Popis:	In this paper we discuss two general models of random simplicial complexes which we call the lower and the upper models. We show that these models are dual to each other with respect to combinatorial Alexander duality. The behaviour of the Betti numbers in the lower model is characterised by the notion of critical dimension, which was introduced by A. Costa and M. Farber: random simplicial complexes in the lower model are homologically approximated by a wedge of spheres of dimension equal the critical dimension. In this paper we study the Betti numbers in the upper model and introduce new notions of critical dimension and spread. We prove that (under certain conditions) an upper random simplicial complex is homologically approximated by a wedge of spheres of the critical dimension. Comment: 31 pages Fixed an error in the proofs approximating the number of simplices in the upper model
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1901.09578 Zobrazit plný text záznamu View this record from Arxiv