Tractatus Logico-Philosophicus: The general form of a proposition is the general form of a truth function.

Tractatus Logico-Philosophicus (English Edition)

The Tractatus Logico-Philosophicus (widely abbreviated and cited as TLP) is the only book-length philosophical work by the Austrian philosopher Ludwig Wittgenstein that was published during his lifetime. It is recognized by philosophers as a significant philosophical work of the twentieth century. The project had a broad goal: to identify the relationship between language and reality and to define the limits of science.

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The work was originally published in German in 1921 as Logisch-Philosophische Abhandlung (Logical-Philosophical Treatise). In 1922 it was published together with an English translation; the English text and that book bear the Latin title, which was suggested by G. E. Moore as homage to Baruch Spinoza's Tractatus Theologico-Politicus (1670).

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Main theses
There are seven main propositions in the text. These are:

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.
7.This is the general form of a proposition.
8.Whereof one cannot speak, thereof one must be silent.

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Ludwig Josef Johann Wittgenstein (6 April 1889 – 29 April 1951) was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.