Full Idea
Three objections to realism in philosophy of mathematics: mathematical objects have no space/time location, and so no causal role; that such objects are determinate, but reference to numbers aren't; and that there is no abstract/concrete distinction.
Gist of Idea
'Real' maths objects have no causal role, no determinate reference, and no abstract/concrete distinction
Source
Jerrold J. Katz (Realistic Rationalism [2000], Int.xxix)
Book Reference
Katz,Jerrold J.: 'Realistic Rationalism' [MIT 2000], p.-6