6533b7d6fe1ef96bd1265d1d

RESEARCH PRODUCT

On two topological cardinal invariants of an order-theoretic flavour

Santi Spadaro

subject

NoetherianHigher Suslin LinePixley–Roy hyperspacePrimary: 03E04 54A25 Secondary: 03E35 54D70LogicOpen setMathematics::General TopologyDisjoint setsTopological spaceType (model theory)TopologyChangʼs ConjectureChangʼs Conjecture for ℵωFOS: MathematicsBox productMathematicsMathematics - General TopologyConjectureMathematics::Commutative AlgebraGeneral Topology (math.GN)PCF theoryNoetherian typeMathematics - LogicInfimum and supremumMathematics::LogicOIF spaceLogic (math.LO)

description

Noetherian type and Noetherian $\pi$-type are two cardinal functions which were introduced by Peregudov in 1997, capturing some properties studied earlier by the Russian School. Their behavior has been shown to be akin to that of the \emph{cellularity}, that is the supremum of the sizes of pairwise disjoint non-empty open sets in a topological space. Building on that analogy, we study the Noetherian $\pi$-type of $\kappa$-Suslin Lines, and we are able to determine it for every $\kappa$ up to the first singular cardinal. We then prove a consequence of Chang's Conjecture for $\aleph_\omega$ regarding the Noetherian type of countably supported box products which generalizes a result of Lajos Soukup. We finish with a connection between PCF theory and the Noetherian type of certain Pixley-Roy hyperspaces.

yearjournalcountryeditionlanguage
2012-12-22
10.1016/j.apal.2012.05.011http://arxiv.org/abs/1212.5725