Tag Archives: square

Abstract: Let $\lambda$ denote a singular cardinal. Zeman, improving a previous result of Shelah, proved that ${\mathrm{<img\; draggable="false"\; role="img"\; class="emoji"\; alt="◻"\; src="https://s.w.org/images/core/emoji/15.0.3/svg/25fb.svg">}}_{\lambda }^{\ast }$ together with $2^{\lambda }={\lambda }^{+}$ implies ${\mathrm{♢}}_S$ for every $S\subseteq {\lambda }^{+}$ that reflects stationarily often. In this paper, for a subset $S\subset {\lambda }^{+}$, a normal subideal of … Continue reading →