May. 19th, 2020

juan_gandhi: (Default)
Mac Lane, Moerdijk.
Seems like every time I bump into a problem and spend a week googling and trying to figure out, I should just open this book and find an explicit answer. In other publications they just say "it can be easily proved that..."
E.g. try to prove that in a well-pointed topos Ω≅1+1



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Juan-Carlos Gandhi

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