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Quote of the day: Yuri Gurevich

I remember, in a geometry class, my teacher wanted to prove the congruence of two triangles. Let’s take a third triangle, she said, and I asked where do triangles come from. I worried that there may be no more triangles there. Those were hard times in Russia and we were accustomed to shortages. She looked at me for a while and then said: ‘Shut up’.

-Platonism, Constructivism, and Computer Proofs vs. Proofs by Hand

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