Full Idea
Mathematical objects have no properties other than those relating them to other 'elements' of the same structure.
Gist of Idea
Mathematical objects only have properties relating them to other 'elements' of the same structure
Source
Paul Benacerraf (What Numbers Could Not Be [1965], p.285), quoted by Fraser MacBride - Structuralism Reconsidered §3 n13
Book Reference
'Oxf Handbk of Philosophy of Maths and Logic', ed/tr. Shapiro,Stewart [OUP 2007], p.581
A Reaction
Suppose we only had one number - 13 - and we all cried with joy when we recognised it in a group of objects. Would that be a number, or just a pattern, or something hovering between the two?