Wittgenstein before breakfast III

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.

  1. The world is all 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.
  6. The general form of a truth-function is [p, E, N(E)].
  7. What we cannot speak about we must pass over in silence.

From the Tractatus Logico-Philosophicus, available widely in print and online (this version).

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