... thereare examples of rectangles, rhombuses and quadrilaterals which are not squares, D is a propersubset of the other three. In a similar manner wesee that В is a proper subset of A and С is a propersubset ... shadeSCHAUM'S OUTLINE OF THEORY AM) PROBLEMS OF PROBABILITY SEYMOURLIPSCHUTZ, Ph.D. Professor of MathematicsTemple University SCHAUM'S OUTLINE SERIES McGRAW-HILL New York SanFrancisco Washington, ... shown below.Here each point P represents an ordered pair (o, 6) of real numbers, and vice versa. 2 -3 -2 -1 2 О з • -1 -2 Example 1.13: Let A = {1,2,3} and В ={a,b}. Then AxBr {(l,a), A,6),...