Hi Ondrej, I stumbled over
http://isabelle.in.tum.de/repos/isabelle/rev/558e4e77ce69 where you have introduced Finite_Set.fold which on finite sets is equal to Set.project (cf. http://isabelle.in.tum.de/repos/isabelle/rev/558e4e77ce69#l1.41) and on infinite sets is underspecified. Would there be any obstacle to use Set.project consistently instead? If you prefer the name »filter« over »project«, feel free to rename Set.project accordingly – the tradition there is not so deep-rooted yet. Best, Florian -- PGP available: http://home.informatik.tu-muenchen.de/haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de
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