"Трактат логіко-філософський" (or "Tractatus Logico-Philosophicus") is a philosophical work by Ludwig Wittgenstein, published in 1921. The text explores the relationship between language, reality, and thought, proposing that the structure of language reflects the structure of reality. Wittgenstein argues that many philosophical problems arise from misunderstandings of language. The work is divided into a series of numbered propositions, culminating in the idea that "whereof one cannot speak, thereof one must be silent." This statement emphasizes the limits of language and suggests that meaningful discourse is confined to what can be clearly articulated. The "Tractatus" has had a significant impact on 20th-century philosophy, particularly in the fields of analytic philosophy and logical positivism.