D'Angelo Mathematical thinking : problem-solving and proofs / John P. D?Angelo, Douglas B. West. - 2nd ed.. - Upper Saddle River Prentice Hall 2000. - xx, 412p. ill. 24cm Includes index p.403 - 412 ISBN: 0132449021 Subjects--Topical Terms: MathematicsProblem solving Dewey Class. No.: 510 DAN 2000