Single Idea 13520

[catalogued under 4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL]

Full Idea

'For every number x, x = x' is not a tautology, because it includes no connectives.

Gist of Idea

A 'tautology' must include connectives

Source

Robert S. Wolf (A Tour through Mathematical Logic [2005], 1.2)

Book Reference

Wolf,Robert S.: 'A Tour Through Mathematical Logic' [Carus Maths Monographs 2005], p.11

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Related Idea

Idea 9528 A wff is a 'tautology' if all assignments to variables result in the value T [Lemmon]