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Problem of universals
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===Penrose=== [[Roger Penrose]] contends that the [[philosophy of mathematics|foundations of mathematics]] can't be understood without the Platonic view that "mathematical truth is absolute, external and eternal, and not based on man-made criteria ... mathematical objects have a timeless existence of their own..."<ref>{{cite book|last1=Penrose|first1=Roger|title=The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics|url=https://archive.org/details/emperorsnewmindc00penr|url-access=registration|date=1989|publisher=Oxford University Press|location=Oxford|isbn=9780198519737|page=[https://archive.org/details/emperorsnewmindc00penr/page/151 151]}}</ref>
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