Single Idea 11066

[catalogued under 5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic]

Full Idea

For Dummett the semantics of the metalanguage is the external and objective source of the justification of deduction.

Gist of Idea

Deduction is justified by the semantics of its metalanguage

Source

report of Michael Dummett (The Justification of Deduction [1973]) by Robert Hanna - Rationality and Logic 3.4

Book Reference

Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.67


A Reaction

This is offered as an answer to the Lewis Carroll problem that justifying deduction seems to need deduction, thus leading to a regress. [There is a reply to Dummett by Susan Haack]