Tractatus Logico-Philosophicus

The *Tractatus Logico-Philosophicus* (often shortened to TLP) is the sole book-length philosophical work by Austrian philosopher Ludwig Wittgenstein to appear in his lifetime. Its broad aim was to clarify the connection between language and reality, and to establish the boundaries of science. Wittgenstein drafted the notes while serving as a soldier in World War I, finishing the manuscript during military leave in mid-1918. First published in German in 1921 under the title *Logisch-Philosophische Abhandlung*, it was reissued in 1922 with an English translation and a Latin title. G. E. Moore suggested the Latin name as a tribute to Baruch Spinoza’s *Tractatus Theologico-Politicus* (1670).

The book is written in a spare, concise style, lacking conventional arguments and instead presenting 525 numbered declarative statements arranged in a hierarchical system. Philosophers regard it as one of the twentieth century’s most important philosophical works. It strongly influenced the logical positivists of the Vienna Circle, including Rudolf Carnap and Friedrich Waismann, and also shaped Bertrand Russell’s essay “The Philosophy of Logical Atomism.” Wittgenstein’s later writings, especially the posthumous *Philosophical Investigations*, criticized many positions taken in the *Tractatus*. However, scholars such as Pears (1987) and Hilmy (1987) have argued against a sharp divide between “early” and “late” Wittgenstein, pointing to continuity in his thinking. One neglected thread is his treatment of “meaning as use,” which appears in both early and later work through his emphasis on the direct consequences of a term or phrase, as when he describes language as a “calculus.” These passages are central to his view of meaning as use, though they have often been overlooked in scholarship. Their importance is supported by renewed study of Wittgenstein’s *Nachlaß*, as shown in works like “From Tractatus to Later Writings and Back – New Implications from Wittgenstein’s Nachlass” (de Queiroz 2023), “From the Notebooks to the Investigations and Beyond” (de Queiroz 2025a), and “Meaning as Use, Application, Employment, Purpose, Usefulness” (de Queiroz 2025b).

The *Tractatus* is noted for its aphoristic or epigrammatic style. When Bertrand Russell advised Wittgenstein to include arguments rather than mere assertions, Wittgenstein replied that doing so would ruin the book’s beauty, comparing it to touching a flower with muddy hands. Wittgenstein himself described the style as “highly syncopated” and later regretted it; in 1949 he told Maurice O’Connor Drury that each sentence should be seen as a chapter heading needing further explanation. The German text first appeared in 1921 in the 14th issue of Wilhelm Ostwald’s *Annalen der Naturphilosophie*. The English translation included an introduction by Russell, though Wittgenstein felt it was superficial and misunderstood his work. The book is dedicated to Wittgenstein’s close friend David Pinsent, who died in a flying accident in 1918. Below the dedication is a motto from Austrian writer Ferdinand Kürnberger: “and whatever a man knows, whatever is not mere rumbling and roaring that he has heard, can be said in three words” (Pears and McGuinness translation). In 1919, Wittgenstein tried to publish the *Tractatus* in the Austrian journal *Der Brenner*. In a letter to editor Ludwig von Ficker, he explained the book’s ethical point: “My work consists of two parts: the one presented here plus all that I have not written. And it is precisely this second part that is the important one. My book draws limits to the sphere of the ethical from the inside as it were, and I am convinced that this is the ONLY rigorous way of drawing those limits. In short, I believe that where many others today are just gassing, I have managed in my book to put everything firmly into place by being silent about it.”

The text contains seven main propositions: (1) The world is everything that is the case. (2) What is the case (a fact) is the existence of states of affairs. (3) A logical picture of facts is a thought. (4) A thought is a proposition with a sense. (5) A proposition is a truth-function of elementary propositions. (An elementary proposition is a truth-function of itself.) (6) The general form of a proposition is the general form of a truth function, which is: [p̄, ξ̄, N(ξ̄)]. (7) What we cannot speak about we must pass over in silence.