Function vstd::set_lib::lemma_set_intersect_again1

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pub proof fn lemma_set_intersect_again1<A>(a: Set<A>, b: Set<A>)

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ensures

(a.intersect(b)).intersect(b) =~= a.intersect(b),

Taking the intersection of sets a and b and then taking the intersection of the result with b is the same as taking the intersection of a and b once.