Moment-angle complexes from simplicial posets |
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Authors: | Zhi Lü Taras Panov |
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Institution: | 1.Institute of Mathematics, School of Mathematical Sciences,Fudan University,Shanghai,China;2.Department of Geometry and Topology, Faculty of Mathematics and Mechanics,Moscow State University,Leninskie Gory, Moscow,Russia;3.Institute for Theoretical and Experimental Physics,Moscow,Russia |
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Abstract: | We extend the construction of moment-angle complexes to simplicial posets by associating a certain T
m
-space Z
S
to an arbitrary simplicial poset S on m vertices. Face rings ℤS] of simplicial posets generalise those of simplicial complexes, and give rise to new classes of Gorenstein and Cohen-Macaulay
rings. Our primary motivation is to study the face rings ℤS] by topological methods. The space Z
S
has many important topological properties of the original moment-angle complex Z
K
associated to a simplicial complex K. In particular, we prove that the integral cohomology algebra of Z
S
is isomorphic to the Tor-algebra of the face ring ℤS]. This leads directly to a generalisation of Hochster’s theorem, expressing the algebraic Betti numbers of the ring ℤS] in terms of the homology of full subposets in S. Finally, we estimate the total amount of homology of Z
S
from below by proving the toral rank conjecture for the moment-angle complexes Z
S
. |
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Keywords: | |
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