|
This article is cited in 58 scientific papers (total in 59 papers)
Torus actions, combinatorial topology, and homological algebra
Victor M. Buchstaber [Bukhshtaber], Taras E. Panov Department of Mathematics and Mechanics, Moscow State University
Abstract:
This paper is a survey of new results and open problems connected with fundamental combinatorial concepts, including polytopes, simplicial complexes, cubical complexes, and arrangements of subspaces. Attention is concentrated on simplicial and cubical subdivisions of manifolds, and especially on spheres. Important constructions are described that enable one to study these combinatorial objects by using commutative and homological algebra. The proposed approach to combinatorial problems is based on the theory of moment-angle complexes recently developed by the authors. The crucial construction assigns to each simplicial complex $K$ with $m$ vertices a $T^m$-space $\mathscr Z_K$ with special bigraded cellular decomposition. In the framework of this theory, well-known non-singular toric varieties arise as orbit spaces of maximally free actions of subtori on moment-angle complexes corresponding to simplicial spheres. It is shown that diverse invariants of simplicial complexes and related combinatorial-geometric objects can be expressed in terms of bigraded cohomology rings of the corresponding moment-angle complexes. Finally, it is shown that the new relationships between combinatorics, geometry, and topology lead to solutions of some well-known topological problems.
Received: 10.08.2000
Citation:
Victor M. Buchstaber [Bukhshtaber], Taras E. Panov, “Torus actions, combinatorial topology, and homological algebra”, Russian Math. Surveys, 55:5 (2000), 825–921
Linking options:
https://www.mathnet.ru/eng/rm320https://doi.org/10.1070/RM2000v055n05ABEH000320 https://www.mathnet.ru/eng/rm/v55/i5/p3
|
|