Full Idea
We incline to think of the Peano axioms as truths of some sort; so there has to be a philosophical question how we ought to conceive of the nature of the facts which make those statements true.
Gist of Idea
What facts underpin the truths of the Peano axioms?
Source
Crispin Wright (Frege's Concept of Numbers as Objects [1983], Intro)
Book Reference
Wright,Crispin: 'Frege's Conception of Numbers' [Scots Philosophical Monographs 1983], p.-8
A Reaction
[He also asks about how we know the truths]