lean2/library/data/set/set.md

data.set

Subsets of an arbitrary type.

• basic : unions, intersections, etc.
• comm_semiring
• function : functions from one set to another
• map : set functions bundled with their domain and codomain
• finite : the "finite" predicate on sets
• card : cardinality (for finite sets)
• filter : filters on sets
• classical_inverse : inverse functions, defined classically