(subset? set1 set2)
Is set1 a subset of set2?
user> (clojure.set/subset? #{2 3} #{1 2 3 4}) true user> (clojure.set/subset? #{2 4} #{1 2 3 4}) true user> (clojure.set/subset? #{2 5} #{1 2 3 4}) false