The Theory of Sets of Points (Classic Reprint) W. H. Young

The theory of sets, first developed in the 1870s, was recognised as one of the most important new branches of mathematical science. This introduction to the subject, published in 1906, as a "simple presentation"; was acknowledged by the authors as effectively a work in progress on a continuously advancing subject. Это и многое другое вы найдете в книге The Theory of Sets of Points (Classic Reprint) (W. H. Young)