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INdAM Fellowship Programs in Mathematics and/or Applications cofunded by Marie Skłodowska-Curie Actions

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Santi Spadaro

Santi Spadaro

INdAM-COFUND Outgoing fellow between 2012-02-01 and 2013-01-31

Project information


Cardinal Functions and Discrete Sets

Outgoing host organisation                                         Return host organisation

York University                                                                        Universita degli Studi di Catania
Department of Mathematics and Statistics                        Dipartimento di Matematica e Informatica

4700 Keele Street                                                                      Viale Andrea Doria, 6
M3J 1P3 Toronto, Canada                                                       98125 Catania, Italy                                                    



My project will investigate discrete sets in connection with covering properties (D-spaces), cardinal functions (discrete reflection of cardinality) and selection principles (D-separability). It will also investigate a new class of cardinal functions of an order-theoretic flavor which have been shown to be amenable to the techniques of Shelah’s PCF theory and sensitive
to very large cardinals.

In the first part I plan to attack some problems regarding chain-condition-type properties in products, in particular to study the influence of Chang Conjecture and forcing axioms on their behavior. In the second part I plan to study some properties involving discrete sets and nowhere dense sets similar to properties in the framework of Selection Principles in Mathematics and try to isolate new selection principles inspired by these properties. In the third part I plan to study the way that closures of discrete sets reflect properties of topological spaces (especially cardinality and covering properties). In particular I will try to give more partial positive answers to Arhangel’skii’s question asking whether closures of discrete sets reflect cardinality in compact spaces. Moreover, I plan to attack some special cases of van Douwen’s D-space problem, for example, the construction of a T1 counterexample from the usual axioms of Zermelo-Fraenkel Set Theory.

Fellow information

Previous positions, awards

  • August 2011-February 2012: Visiting Assistant Professor, Miami University,
  • 2011: INFTY Short Visit Grant, European Mathematical
  • 2010-2011: VATAT grant, Israeli Council of Higher
  • 2009-2011: Postdoctoral Fellow, Center for Advanced Study,
    Ben Gurion University of the Negev, Israel
  • 2008: Ben Fitzpatrick Memorial Fellowship, Auburn

Publications, preprints, other works

  1. S. Spadaro, Covering by discrete and closed
    discrete sets
    , Topology and its Applications, 156 (2009), 721-727
  2. S. Spadaro, A note on discrete
    , Commentationes Mathematicae Universitatis Carolinae, 50,
    3 (2009), 463-475
  3. A. Bella, C. Costantini, S. Spadaro, P-spaces and
    the Whyburn Property
    , Houston Journal of Mathematics, 37, 3 (2011),
  4. M. Kojman, D. Milovich,
    S. Spadaro, Order-theoretic properties of bases in topological
    spaces, I
    , submitted, 20 pages
  5. A. Bella, M. Matveev, S. Spadaro, Variations of
    selective separability, II: discrete sets and the influence of
    convergence and maximality
    , Topology and its Applications, 159,
    1 (2012), 253-271
  6. S. Spadaro, A short proof of a theorem of
    , Topology and its Applications, 158 (2011), 2091-2093
  7. S. Spadaro, On two cardinal invariants of an
    order-theoretic flavour
    , Annals of Pure and Applied Logic,
    163 (2012), 1865-1871
  8. S. Spadaro, P-spaces and the Volterra
    , Bulletin of the Australian Mathematical Society, in press
  9. D. Soukup, L.Soukup, S. Spadaro, Comparing weak versions of separability, preprint (2012); arXiv:1210.4986, 29 pages, submitted
  10. A. Bella, S. Spadaro, Infinite games and cardinal properties of topological spaces, preprint (2012); arXiv:1212.5725, 14 pages, submitted
  11. N. May, S. Spadaro, P. Szeptycki, A new class of
    Lindelof spaces all of whose finite powers are Lindelof
    , 20 pages,
    submitted (arXiv preprint to come soon)
  12. S. Spadaro, Discrete sets and cardinal
    , in preparation

Conferences, schools, other events

  • Invited talk (title to be announced)
    Logic Seminar
    University of Colorado-Boulder, USA, 16 April 2013
  • Invited talk (title to be announced)
    at the Special Session in Boolean Algebras
    and Set Theory, Spring Western Sectional Meeting of the American
    Mathematical Society

    Boulder, Colorado, USA, 13-14 April 2013
  • Short talk Introduction to Elementary Submodels
    at the Eighth Italian-Spanish Conference on
    General Topology and its Applications

    Università degli Studi di Trieste, Trieste, Italy, 3-7 September 2012
  • One-hour talk Noetherian type of products
    at the Eighth Italian-Spanish Conference on
    General Topology and its Applications

    Università degli Studi di Trieste, Trieste, Italy, 3-7 September 2012
  • Job talk Independence results about an order-theoretic cardinal invariant
    at the University of Wisconsin-Parkside
    Kenosha, WI, USA, 5 March 2012
  • Talk Noetherian type and other topological
    cardinal invariants of an order-theoretic flavour

    at the Set Theory Seminar, Fields Institute, Toronto
    Ontario, Canada, 2 March 2012

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