Qu'est-ce que les mathématiques ? : une introduction élémentaire aux idées et aux méthodes

What Is Mathematics? is a mathematics book written by Richard Courant and Herbert Robbins, published in England by Oxford University Press. It is an introduction to mathematics, intended both for the mathematics student and for the general public. First published in 1941, it discusses number theory, geometry, topology and calculus.
A second edition was published in 1996 with an additional chapter on recent progress in mathematics, written by Ian Stewart.