[isabelle-dev] cardinality primitives in Isabelle/HOL?
florian.haftmann at informatik.tu-muenchen.de
Thu Dec 27 13:45:36 CET 2018
>> Anyway, I am uncertain about the name »poll«.
> From https://en.wikipedia.org/wiki/Cardinality
> "Two sets A and B have the same cardinality if there exists a bijection from A to B, that is, a function from A to B that is both injective and surjective. Such sets are said to be equipotent, equipollent, or equinumerous. This relationship can also be denoted A ≈ B or A ~ B.”
I see. Using »poll« is a stem, the canonical names would be
(I don't know how useful the strict versions less_poll, greater_poll
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