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Full Idea
The indispensability of arithmetical concepts is evidence that they do in fact accurately represent features of the independent world.
Gist of Idea
Arithmetic concepts are indispensable because they accurately map the world
Source
Carrie Jenkins (Grounding Concepts [2008], Intro)
Book Ref
Jenkins,Carrie: 'Grounding Concepts' [OUP 2008], p.9
A Reaction
This seems to me to be by far the best account of the matter. So why is the world so arithmetical? Dunno, mate; ask someone else.