Logic, sets, & numbers / Louis F. Roethel, Abraham Weinstein. Roethel, Louis F. Weinstein, Abraham, joint author. Mathematics. QA39.2 .R64 1976 511.3 19 ROL Includes index. Belmont, Calif. : Wadsworth Pub. Co., 1976. 1976. 1976 Text viii, 351 p. : eng