The Principles of Mathematics
Publisher: W. W. Norton & Company
Published: February 1996
Language: eng
Number of pages: 534
ISBN-13: 9780393314045
First sentence: 1. PURE Mathematics is the class of all propositions of the form "p implies q," where p and q are propositions containing one or more variables, the same in the two propositions, and neither p nor q contains any constants except logical constants.