without concern about order and assuming no duplication).

:union(set, set, ...) => union

:intersection(set, set, ...) => intersection

iff*erence(set1, set2, ..., setn)

=> result of removing all elements of sets 2..n from set 1.

:exclusive_or(set, set, set, ...)

=> all elements that are contained in exactly one of the sets

:includes(set1, set2, ..., setn)

=> true if and only if all of sets 2..n are subsets of set 1

:equal(set1, set2)

=> true if and only if set1 and set2 are equal

See also: ?$list_utils

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