A rigid Boolean algebra that admits the elimination of Q21
Tom 142 / 1993
Fundamenta Mathematicae 142 (1993), 1-18
DOI: 10.4064/fm-142-1-1-18
Streszczenie
Using ♢ , we construct a rigid atomless Boolean algebra that has no uncountable antichain and that admits the elimination of the Malitz quantifier $Q_1^2$.
