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Full Idea
Many different kinds of mathematical objects (natural numbers, the reals, points, lines, figures, groups) can be regarded as forms of abstraction, with special theories having their basis in a general theory of abstraction.
Gist of Idea
Many different kinds of mathematical objects can be regarded as forms of abstraction
Source
Kit Fine (The Limits of Abstraction [2002], I.4)
Book Ref
Fine,Kit: 'The Limits of Abstraction' [OUP 2008], p.46
A Reaction
This result, if persuasive, would be just the sort of unified account which the whole problem of abstact ideas requires.