Function vstd::set_lib::lemma_set_union_again1
source · pub proof fn lemma_set_union_again1<A>(a: Set<A>, b: Set<A>)Expand description
ensures
a.union(b).union(b) =~= a.union(b),Taking the union of sets a and b and then taking the union of the result with b
is the same as taking the union of a and b once.