What is mathematics? : an elementary approach to ideas and methods / by Richard Courant and Herbert Robbins. Courant, Richard, 1888-1972. Robbins, Herbert, author. Mathematics. 510.1 COW "First issued as an Oxford University Press paperback, 1978" -- Verso of t.p. Issued with various printing dates. Includes bibliographical references and index. Bibliography: p. [511]-514. Oxford ; New York : Oxford University Press, 1978, c1969. 1978, c1969. 1978 Text [20], 521 p. ; eng Galaxy book ; GB576 Galaxy book ; GB576.