On a problem of Steve Kalikow

Saharon Shelah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The Kalikow problem for a pair (λ, κ) of cardinal numbers, λ > κ (in particular κ = 2) is whether we can map the family of ω-sequences from λ to the family of ω-sequences from κ in a very continuous manner. Namely, we demand that for η, ν ∈ ω λ we have: η, ν are almost equal if and only if their images are. We show consistency of the negative answer, e.g., for אω but we prove it for smaller cardinals. We indicate a close connection with the free subset property and its variants.

Original languageEnglish
Pages (from-to)137-151
Number of pages15
JournalFundamenta Mathematicae
Volume166
Issue number1-2
StatePublished - 2001

Keywords

  • Continuity
  • Forcing
  • Free subset
  • Kalikow
  • Set theory

Fingerprint

Dive into the research topics of 'On a problem of Steve Kalikow'. Together they form a unique fingerprint.

Cite this