Weak square sequences and special Aronszajn trees
Tom 221 / 2013
Fundamenta Mathematicae 221 (2013), 267-284
MSC: Primary 03E05.
DOI: 10.4064/fm221-3-4
Streszczenie
A classical theorem of set theory is the equivalence of the weak square principle $\Box _\mu ^*$ with the existence of a special Aronszajn tree on $\mu ^+$. We introduce the notion of a weak square sequence on any regular uncountable cardinal, and prove that the equivalence between weak square sequences and special Aronszajn trees holds in general.
