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Single Idea 16310

[filed under theme 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 Ref

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