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  1. No Access

    Article

    Infinite games on finite sets

    We study a family of infinite games with imperfect information introduced by B. Model for two players that alternately remove and add points to a finite set. We investigate the existence of imperfect informati...

    Uri Abraham, Rene Schipperus in Israel Journal of Mathematics (2007)

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    Article

    On Jakovlev spaces

    A topological spaceX is called weakly first countable, if for every pointx there is a countable family {C n x |n ∈ω} such thatx ∈C ...

    Uri Abraham, Isaac Gorelic, István Juhász in Israel Journal of Mathematics (2006)

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    Article

    On a superatomic Boolean algebra which is not generated by a well-founded sublattice

    Let b denote the unboundedness number of ωω. That is, b is the smallest cardinality of a subset \(F \subseteq \omega ^\omega \) ...

    Uri Abraham, Matatyahu Rubin, Robert Bonnet in Israel Journal of Mathematics (2001)

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    Article

    Initial segments of the degrees of size ℵ1

    We settle a series of questions first raised by Yates at the Jerusalem (1968) Colloquium on Mathematical Logic by characterizing the initial segments of the degrees of unsolvability of size ℵ1: Every upper semi-l...

    Uri Abraham, Richard A. Shore in Israel Journal of Mathematics (1986)