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Single Idea 3318

[filed under theme 9. Objects / F. Identity among Objects / 5. Self-Identity ]

Full Idea

It was Frege who first made identity a logical notion, enshrining it above all in the formula (x) x=x.

Clarification

Gottlob Frege was an Austrian logician who flourished c. 1890

Gist of Idea

Frege made identity a logical notion, enshrined above all in the formula 'for all x, x=x'

Source

report of Gottlob Frege (works [1890]) by José A. Benardete - Metaphysics: the logical approach Ch.9

Book Ref

Benardete,José A.: 'Metaphysics: The Logical Approach' [OUP 1989], p.55