For many temporary reasons I was not able, before going into print, to give a fuller list of the writings of those four unique men; but there is no stroke of their pen but which should be read with great attention—besides which there is a very valuable literature about their work.
(1) The purely mathematical foundation:
Russell, Bertrand.
“The Principles of Mathematics.” Cambridge University, 1903.
(I am not giving any selections from the contents of this book because this book should, without doubt, be read by every one interested in mathematical philosophy.)
“The Problems of Philosophy.” H. Holt & Co., N. Y., 1912.
“Our Knowledge of the External World, as a Field for Scientific Method in Philosophy.” Chicago, 1914.
“Introduction to Mathematical Philosophy.” Macmillan, N. Y.
Selection from contents: Definition of number. The Definition of order. Kinds of relations. Infinite cardinal numbers. Infinite series and ordinals. Limits and continuity. The axiom of infinity and logical types. Classes. Mathematics and logic.
“Mysticism and Logic.” Longmans Green & Co. 1919. N. Y.