Tag Archives: Cardinal Invariants

On the ideal J[kappa]

Abstract. Motivated by a question from a recent paper by Gilton, Levine and Stejskalova, we obtain a new characterization of the ideal J[κ], from which we confirm that κ-Souslin trees exist in various models of interest. As a corollary we … Continue reading

Posted in Publications, Souslin Hypothesis | Tagged , , | 1 Comment

Bell’s theorem on the cardinal invariant p

In this post, we shall provide a proof to a famous theorem of Murray Bell stating that MAκ(the class of σ-centered posets) holds iff κ<p. We commence with defining the cardinal invariant p. For sets A and B, … Continue reading

Posted in Blog, Expository | Tagged , | 2 Comments

Bell’s theorem on the cardinal invariant p

In this post, we shall provide a proof to a famous theorem of Murray Bell stating that MAκ(the class of σ-centered posets) holds iff κ<p. We commence with defining the cardinal invariant p. For sets A and B, … Continue reading

Posted in Blog, Expository | Tagged , | 2 Comments

Infinite Combinatorial Topology

Back in 2005, as a master student, I attended a course by Boaz Tsaban, entitled “Infinite Combinatorial Topology”. A friend and I decided to produce lecture notes, but in a somewhat loose sense, that is: we sometimes omit material given … Continue reading

Posted in Notes | Tagged , , , | 8 Comments