Hi, I’m using the ordinalTheory and cardinalTheory (in "examples/set-theory/hol_sets”) with the following proposition unprovable:
Suppose I have a ONE_ONE function (f :’a ordinal -> ‘b), and an infinite set (B: ‘b set), how can I assert the existence of an ordinal ``n`` such that ``(f n) NOTIN B``? Regards, Chun Tian
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