'Tractatus Logico-Philosophicus' Summary

The Tractatus Logico-Philosophicus  is the only book-length philosophical work by the Austrian philosopher Ludwig Wittgenstein which was published during his lifetime. The project had a broad goal: to identify the relationship between language and reality and to define the limits of science. The work was originally published in German in 1921 as Logisch-Philosophische Abhandlung . In 1922 it was published together with an English translation; the English text and that book bear the Latin title, which was suggested by G. E. Moore as homage to Baruch Spinoza's Tractatus Theologico-Politicus (1670).

Wittgenstein wrote the notes for the Tractatus while he was a soldier during World War I and completed it during a military leave in the summer of 1918.

The Tractatus is recognized by philosophers as a significant philosophical work of the twentieth century and was influential chiefly amongst the logical positivist philosophers of the Vienna Circle, such as Rudolf Carnap and Friedrich Waismann. Bertrand Russell's article "The Philosophy of Logical Atomism" is presented as a working out of ideas that he had learned from Wittgenstein.

Wittgenstein's later works, notably the posthumously published Philosophical Investigations, criticised many of his earlier ideas in the Tractatus.