WIP: Rewriting countability and finiteness #83
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countability and finiteness now share the interface of
countType
andfinType
through the coercionscountable >-> Sortclass
andfinite >-> Sortclass
e.g.
rpickle c
is replaced by@pickle [countType of c]
wherec : countable E
.Additionally, sketching lemmas about combining infinite, finite and cofinite sets.
This is a draft, it does not compile anymore, but it sketches improvements of countability theory.