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Full Idea
Many of the crucial definitions in the logicist programme are in fact impredicative.
Gist of Idea
Many crucial logicist definitions are in fact impredicative
Source
David Bostock (Philosophy of Mathematics [2009], 8.2)
Book Ref
Bostock,David: 'Philosophy of Mathematics: An Introduction' [Wiley-Blackwell 2009], p.237