平均运算(原始内容存档于2021-05-06) . Charatonik, Janusz J., Selected problems in continuum theory (PDF), Topology Proceedings, 2003, 27 (1): 51–78 [2019-11-19], MR 2048922
駱駝函數Continuum function)和基數指數函數。根據柯尼希定理(英语:König's theorem (set theory)),有 ℷ ( κ ) > κ {\displaystyle \gimel (\kappa )>\kappa } 。 Thomas Jech, Set Theory,