Assertion: ring's set | /r/HasProperty | idempotent
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Source sentences:
text: The subsets include the empty set Phi, the sets with exactly one element of A, the sets with exactly two elements of A, .. the sets with all except one element of A and the set A. Example: Given the set A = {a, b, c} the set of all subsets = { Phi, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c} } which has cardinality 8 = 2**3 Laws that hold for sets where A, B and C are sets: Idempotent: A intersect A = A