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Single Idea 14107

[filed under theme 9. Objects / F. Identity among Objects / 7. Indiscernible Objects ]

Full Idea

Two terms are identical when the second belongs to every class to which the first belongs.

Gist of Idea

Terms are identical if they belong to all the same classes

Source

Bertrand Russell (The Principles of Mathematics [1903], §026)

Book Ref

Russell,Bertrand: 'Principles of Mathematics' [Routledge 1992], p.23