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Euler flag enumeration of Whitney stratified spaces

Authors: Ehrenborg, Richard; Goresky, Mark; Readdy, Margaret;

Euler flag enumeration of Whitney stratified spaces

Abstract

We show the $\mathrm{cd}$-index exists for Whitney stratified manifolds by extending the notion of a graded poset to that of a quasi-graded poset. This is a poset endowed with an order-preserving rank function and a weighted zeta function. This allows us to generalize the classical notion of Eulerianness, and obtain a $\mathrm{cd}$-index in the quasi-graded poset arena. We also extend the semi-suspension operation to that of embedding a complex in the boundary of a higher dimensional ball and study the shelling components of the simplex. Nous montrons le $\mathrm{cd}$-index existe pour les manifolds de Whitney stratifiées en élargissant la notion d’un poset gradué à celle qu'un poset quasi-gradué. C’est un poset doté d'une fonction de rang que préservant l’ordre du poset et une fonction de zêta pondérée. Ceci nous permet de généraliser la notion classique de “Eulerianness”, et obtenir un $\mathrm{cd}$-index dans l’arène des posets quasi-gradués. Nous tenons également à l’opération de semi-suspension pour que d’intégrer une complexe dans la frontière d’une balle de dimension supérieur et étudions les composants shelling d’un simplex.

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Keywords

06A07 (Primary) 52B05, 57N80 (Secondary), Eulerian condition, Combinatorial aspects of simplicial complexes, [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], semisuspension, Combinatorics of partially ordered sets, Whitney's conditions A and B., whitney's conditions a and b., [info.info-dm]computer science [cs]/discrete mathematics [cs.dm], Stratifications in topological manifolds, QA1-939, FOS: Mathematics, Mathematics - Combinatorics, Algebraic Topology (math.AT), Mathematics - Algebraic Topology, Whitney's conditions A and B, Shellability for polytopes and polyhedra, eulerian condition, quasi-graded poset, Combinatorial properties of polytopes and polyhedra (number of faces, shortest paths, etc.), [INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM], weighted zeta function, Combinatorics (math.CO), Mathematics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
Average
Average
Green
Published in a Diamond OA journal