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- W2886980392 abstract "Given a shifted order ideal U, we associate to it a family of simplicial complexes ( Δ t ( U ) ) t ⩾ 0 that we call squeezed complexes. In a special case, our construction gives squeezed balls that were defined and used by Kalai to show that there are many more simplicial spheres than boundaries of simplicial polytopes. We study combinatorial and algebraic properties of squeezed complexes. In particular, we show that they are vertex decomposable and characterize when they have the weak or the strong Lefschetz property. Moreover, we define a new combinatorial invariant of pure simplicial complexes, called the singularity index, that can be interpreted as a measure of how far a given simplicial complex is from being a manifold. In the case of squeezed complexes ( Δ t ( U ) ) t ⩾ 0 , the singularity index turns out to be strictly decreasing until it reaches (and stays) zero if t grows." @default.
- W2886980392 created "2018-08-22" @default.
- W2886980392 creator A5008482652 @default.
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- W2886980392 date "2019-07-26" @default.
- W2886980392 modified "2023-09-25" @default.
- W2886980392 title "Squeezed complexes" @default.
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- W2886980392 doi "https://doi.org/10.1112/jlms.12261" @default.
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