Full Idea
Platonism has the attendant problem of how we can succeed in thinking about and referring to entities we can have no causal transactions with.
Gist of Idea
How can you contemplate Platonic entities without causal transactions with them?
Source
Hilary Putnam (Phil of Mathematics: why nothing works [1979], Modalism)
Book Reference
Putnam,Hilary: 'Words and Life', ed/tr. Conant,James [Harvard 1996], p.508