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Given a function , a set is free for if is finite. For a class of functions , we define as the smallest size of a family such that for every there is a set which is free for , and as the smallest size of a family such that for every there is such that is not free for . We compare several versions of these cardinal invariants with some of the classical cardinal characteristics of the continuum. Using these notions, we partially answer some questions from arXiv:1911.01336 [math.LO] and arXiv:2004.01979 [math.GN].

生成讲解博客的中文版本

生成AI智能校验的中文版本