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Full Idea
Dedekind's conception is psychologistic only if that is the only way to understand the abstraction that is involved, which it is not.
Gist of Idea
Dedekind has a conception of abstraction which is not psychologistic
Source
report of Richard Dedekind (Nature and Meaning of Numbers [1888]) by William W. Tait - Frege versus Cantor and Dedekind IV
Book Ref
'Philosophy of Mathematics: anthology', ed/tr. Jacquette,Dale [Blackwell 2002], p.45
A Reaction
This is a very important suggestion, implying that we can retain some notion of abstractionism, while jettisoning the hated subjective character of private psychologism, which seems to undermine truth and logic.