In his lifetime, WITTGENSTEIN published only one book: the Tractatus Logico-Philosophicus, which explores the relationship between language, the mind, and reality, and "the conditions for a logically perfect language." The book builds on and competes with Bertrand Russell's earlier work, and is as grounded in logic and mathematics as in ethics. Through the end of his life, though, he worked on a follow-up and correction to the Tractatus: Philosophical Investigations, which was mostly finished at the time of his death and published shortly thereafter. Broader in scope but still deeply concerned with language and the mind, Investigations takes the reader through thought experiments and language games in order to explore -- rather than simply state -- its points.
* Logisch-Philosophische Abhandlung, Annalen der Naturphilosophie, 14 (1921)
o Tractatus Logico-Philosophicus, translated by C.K. Ogden (1922)
* Philosophische Untersuchungen (1953)
o Philosophical Investigations, translated by G.E.M. Anscombe (1953)
* Bemerkungen über die Grundlagen der Mathematik, ed. by G.H. von Wright, R. Rhees, and G.E.M. Anscombe (1956) (a selection from his writings on the philosophy of logic and mathematics between 1937 and 1944)
o Remarks on the Foundations of Mathematics, translated by G.E.M. Anscombe, rev. ed. (1978)
* Bemerkungen über die Philosophie der Psychologie, ed. G.E.M. Anscombe and G.H. von Wright (1980)
o Remarks on the Philosophy of Psychology, Vols. 1 and 2, translated by G.E.M. Anscombe, ed. G.E.M. Anscombe and G.H. von Wright (1980) (a selection of which makes up 'Zettel')
* The Blue and Brown Books (1958) (Notes dictated in English to Cambridge students in 1933–35)
* Philosophische Bemerkungen, ed. by Rush Rhees (1964)
o Philosophical Remarks (1975)
o Philosophical Grammar (1978)
* Bemerkungen über die Farben, ed. by G.E.M. Anscombe (1977)
o Remarks on Colour ISBN 0520037278. Remarks on Goethe's Theory of Colours.
* On Certainty — A collection of aphorisms discussing the relation between knowledge and certainty, extremely influential in the philosophy of action.
* Culture and Value — A collection of personal remarks about various cultural issues, such as religion and music, as well as critique of Søren Kierkegaard's philosophy.
* Zettel, another collection of WITTGENSTEIN's thoughts in fragmentary/"diary entry" format as with On Certainty and Culture and Value.
A collection of Ludwig WITTGENSTEIN's manuscripts is held by Trinity College, Cambridge.
