Well-known and oft-repeated, but still Wittgenstein’s key propositions from the Tractatus continue to be a useful reminder of the limits of language.
- The world is all that is the case.
- What is the case—a fact—is the existence of states of affairs.
- A logical picture of facts is a thought.
- A thought is a proposition with a sense.
- A proposition is a truth-function of elementary propositions.
- The general form of a truth-function is [p, E, N(E)].
- What we cannot speak about we must pass over in silence.