more from Theodore Sider

### Single Idea 13684

#### [catalogued under 5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth]

Full Idea

The semantical notion of a logical truth is that of a valid formula, which is true in all interpretations. In propositional logic they are 'tautologies'.

Gist of Idea

The semantical notion of a logical truth is validity, being true in all interpretations

Source

Theodore Sider (Logic for Philosophy [2010], 2.3)

Book Reference

Sider,Theodore: 'Logic for Philosophy' [OUP 2010], p.33

A Reaction

This implies that there is a proof-theoretic account of logical truth as well. Intuitively a logical truth is a sequent which holds no matter which subject matter it refers to, so the semantic view sounds OK.