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Full Idea
Ordinal numbers result from likeness among relations, as cardinals from similarity among classes.
Gist of Idea
Ordinals result from likeness among relations, as cardinals from similarity among classes
Source
Bertrand Russell (The Principles of Mathematics [1903], §293)
Book Ref
Russell,Bertrand: 'Principles of Mathematics' [Routledge 1992], p.317