The Tractatus Logico-Philosophicus, written by Ludwig Wittgenstein, is a significant philosophical work that explores the relationship between language and reality and sets the limits of science. It consists of 525 declarative statements and was published in 1921. Wittgenstein’s later works criticized some of the ideas presented in the Tractatus, but there are still connections and continuity in his thinking. The book’s main theses include the existence of a logical picture of facts that represents the world, the distinction between what can be said and what can only be shown, and the idea that most philosophical propositions are nonsensical. The Tractatus has had a profound impact on philosophy and influenced logical positivism.
https://en.wikipedia.org/wiki/Tractatus_Logico-Philosophicus