Published papers: The foundations of mathematics (1925) Mathematical logic (1926) On a problem of formal logic (1928) Universals (1925) Note on the preceding paper (1926) Facts and propositions (1927)
Unpublished papers: Truth and probability (1926) Further considerations (1926) Last papers (1929)
Appendix: Critical notice of L. Wittgenstein's "Tractatus logico-philosophicus" (1923)
