Hilbert的那个旅馆的客房数虽是无穷，却是稀疏的无穷。

来源: 于 2010-06-06 18:54:35 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

那是可数无穷 [ witten1 ] 于:2009-06-22 13:19:12 复:2248132
对于不可数无穷，没法再住了，呵呵。只能说Hilbert的那个旅馆的客房数虽是无穷，却是稀疏的无穷。


so people still can find their hotel room # and its squre