Tractatus logico-philosophicus is Ludwig Wittgenstein's first major work and remains one of the most influential and complex treatises on the nature of language and, on a larger scale, the world as a whole.
It was originally published under the German title "Logisch-philosophische Abhandlung" in Wilhelm Ostwald's "Annalen der Naturphilosophie" in 1918. A revised bilingual edition was published as part of the "International Library of Psychology, Philosophy and Scientific Method" in 1921.
