Open Sets and the Theory of Content
W. H. Young · Proceedings of the London Mathematical Society · 1905
See below, p. 22. t Annali di Matematiea (1902). [My attention was first called to this memoir after the presentation of the present paper.In consequence I have added references to the work of M. Lebesgue, wherever it seemed desirable, and I have partially adopted his nomenclature.The only other alterations made since the presentation of the paper consist in the insertion of one