From the reviews: Volume I covers set theory, the foundations of mathematics and pure mathematics . The papers are presented in their original language together with English translation on the opposite page, each one preceded by an introductory note commenting on the historical background, motivations, accomplishments, and influence. All in all, the volume is remarkable and a very welcome addition to the literature of collected papers in mathematics, of great interest also to philosophers, logicians, and historians of science. (José Ferreirós, Metascience, April, 2011)