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S intersection T = {2, 5}; S union T = {1, 2, 3, 4, 5, 7}; intersection {S, T, U} = {5}; union {S, T, U} = {1, 2, 3, 4, 5, 7, 9}; P(T) = {0, {2}, {5}, {7}, {2, 5}, {2, 7}, {5, 7}, {2, 5, 7}}.
union i in N Ni = N; intersection i in N Ni = {};