Ideas from 'Frege on Apriority' by Tyler Burge [2000], by Theme Structure
[found in 'New Essays on the A Priori' (ed/tr Boghossian,P /Peacocke,C) [OUP 2000,0199241279]].
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6. Mathematics / A. Nature of Mathematics / 2. Geometry
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You can't simply convert geometry into algebra, as some spatial content is lost
