WHO IS FATHER OF SETS?, RENE DESCARTES, ARCHIMEDES, GEORGE CANTOR,  IF A SUBSET TO B AUB=, B, A, NONE OF THESE, A={1,2,4,5} AND B={5,6,4,3} THEN A-B=, {1,2}, {1,3,4}, , FOR ANY SET A,(A')' IS EQUAL TO, A', A, , N(A)=40,N(b)=60 .N(A) INTERSECTION N(B)=50. FIND N(A)UN(B)=, 100, 60, 50, SET OF CONCENTRIC CIRCLES IN A PLANE?, INFINITE SET, FINITE SET, UNIVERSAL SET, EVERY SET IS A SUBSET OF ITSELF., TRUE, FALSE, CAN'T ANSWER.

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