arend-lib
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Generalize the definition of Subset
Subset
s are currently only defined for Monoid
s:
https://github.com/JetBrains/arend-lib/blob/6be71a0b2477906448d873f07277ec3289b31796/src/Algebra/Ring/Localization.ard#L23-L32
while they can be defined for BaseSet
s. It goes without saying that this is useful in general.