Courant, Richard. What is mathematics? : a elementary approach to ideas and methods / Richard Courant and Herbert Robbins; revised by Ian Stewart. - 2nd ed / . - Oxford : Oxford University Press , 1996. - xxiii ,566p. : ill.,fig ; 21cm . NULL ISBN: 0195105192 Rs. 545.00 Subjects--Index Terms: MATHEMATICS Dewey Class. No.: 510 / COU/W