Full Idea
Identifying numbers with extensions will not solve the Caesar problem for numbers unless we have already solved the Caesar problem for extensions.
Gist of Idea
If numbers are extensions, Frege must first solve the Caesar problem for extensions
Source
Crispin Wright (Frege's Concept of Numbers as Objects [1983], 3.xiv)
Book Reference
Wright,Crispin: 'Frege's Conception of Numbers' [Scots Philosophical Monographs 1983], p.112
Related Idea
Idea 9046 Our definition will not tell us whether or not Julius Caesar is a number [Frege]