칸토어-슈뢰더-베른슈타인 정리

[ZFC Set Theory] XII. 칸토어-슈뢰더-베른슈타인 정리 Cantor-Schröder-Bernstein TheoremBy 초코맛 도비

[lang-en]To see the previous post[/lang-en][lang-ko]이전 글 보러가기[/lang-ko] [lang-en]As noted in the previous post, we will address the question, "Is the $\leq$ between the cardinality of sets antisymmetric?" The answer is, YES! The answer is, yes! But what does this mean exactly? Formally, this can be stated as: "If $\lvert X \rvert \leq \lvert Y \rvert$ and $\lvert Y \rvert \leq \lvert X \rvert$ f..