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Perhaps the most important work of philosophy written in the twentieth century, Tractatus Logico-Philosophicus was the only philosophical work that Ludwig Wittgenstein published during his lifetime. Written in short, carefully numbered paragraphs of extreme brilliance, it captured the imagination of a generation of …

Philosophical Investigations is a highly influential work by the 20th-century philosopher Ludwig Wittgenstein. In it, Wittgenstein discusses numerous problems and puzzles in the fields of semantics, logic, philosophy of mathematics, philosophy of psychology, philosophy of action, and the philosophy of mind. He puts …

"Great philosophical biographies can be counted on one hand. Monk's life of Wittgenstein is such a one."—The Christian Science Monitor.

The Blue and Brown Books are two sets of notes taken during lectures conducted by Ludwig Wittgenstein between 1933 and 1935. They were mimeographed as two separated books and a few copies were circulated in a restricted circle during Wittgenstein's lifetime. The lecture notes from 1933–4 were bound in blue cloth and …

On Certainty is a philosophical book composed from the notes written by Ludwig Wittgenstein just prior to his death. Some of the notes were left at the home of G. E. M. Anscombe, who later compiled the notes into a book. The book's concerns are largely epistemological, its main theme being that there are some things …

Culture and Value is a selection from the personal notes of Ludwig Wittgenstein made by Georg Henrik von Wright. It was first published in German as Vermischte Bemerkungen and the text has been emended in following editions. An English translation by Peter Winch was printed in 1980, and reprinted in 1984. Ten years …

Remarks on the Foundations of Mathematics is a book of Ludwig Wittgenstein's notes on the philosophy of mathematics. It has been translated from German to English by G.E.M. Anscombe, edited by G.H. von Wright and Rush Rhees, and published first in 1956. The text has been produced from passages in various sources by …