more from Volker Halbach

### Single Idea 16310

#### [catalogued under 5. Theory of Logic / E. Structures of Logic / 8. Theories in Logic]

Full Idea

A theory is a set of formulae closed under first-order logical consequence.

Gist of Idea

A theory is some formulae and all of their consequences

Source

Volker Halbach (Axiomatic Theories of Truth [2011], 5.1)

Book Reference

Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.29