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Single Idea 18802

[filed under theme 5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives ]

Full Idea

There is no prospect whatever of giving the sense of a logical constant without using that very constant, and much else besides, in the metalinguistic principle that specifies that sense.

Gist of Idea

In specifying a logical constant, use of that constant is quite unavoidable

Source

Ian Rumfitt (The Boundary Stones of Thought [2015], 1.1)

Book Ref

Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.9