Prototractatus Author:Ludwig Wittgenstein This is a facsimile reproduction of an early version of Wittgenstein's Tractatus logico-philosophicus, discovered in 1965. The text is edited to indicate all relevant deviations from the final version. Wittgenstein's Tractatus logico-philosophicus, first published in 1921, has had a profound influence on modern philosophic thought. The orig... more »inal text has a parallel English translation.« less