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Full Idea
Frege rejected Hume's Principle as an implicit definition of number terms, because of the Julius Caesar problem. ....[128] Instead Frege adopted an explicit definition of the number-of function.
Gist of Idea
Hume's Principle fails to implicitly define numbers, because of the Julius Caesar
Source
report of Gottlob Frege (Grundlagen der Arithmetik (Foundations) [1884]) by Michael Potter - The Rise of Analytic Philosophy 1879-1930 19 'Uniq'
Book Ref
Potter,Michael: 'The Rise of Anaytic Philosophy 1879-1930' [Routledge 2020], p.127
Related Ideas
Idea 18145 Many things will satisfy Hume's Principle, so there are many interpretations of it [Bostock]
Idea 18147 Neo-logicists meet the Caesar problem by saying Hume's Principle is unique to number [Bostock]