Discrete mathematics and its applications / Kenneth H. Rosen. Rosen, Kenneth H. Mathematics. Computer science Mathematics. QA39.2 .R654 1991 511.1 20 ROD Includes bibliographical references (p. 17-26, 2nd group) and indexes. New York : McGraw-Hill, c2007. c2007. 1991 Text xxii, 661 [131] p. : eng