Wittgenstein's Tractatus

3. A logical picture of facts is a thought.

3.1In a proposition a thought finds an expression that can be perceived by the senses.
3.2In a proposition a thought can be expressed in such a way that elements of the propositional sign correspond to the objects of thought.
3.3Only propositions have sense; only in the nexus of a proposition does a name have meaning.
3.4A proposition determines a place in logical space. The existence of this logical place is guaranteed by the mere existence of the constituents -- by the existence of the proposition with a sense.
3.5A propositional sign, applied and thought out, is a thought.





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