Courant;Richard and Robbins;Herbert. What is Mathematics? An Elementaty Approach to Ideas and Methods Textual Documents - Sixth Printing 1953. - London: Oxford University Press, 1953. - xix; 521p.: 01109. Subjects--Uniform Titles: Mathematics;Maxima and Minima;The Calculus. Subjects--Index Terms: Projective Geometry,Axiomatics,Non-Euclidean Geometries Hypernbolic Non-Euclidean Geometry Dewey Class. No.: 510 COU