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although i'm quite fascinated: perhaps by a topological semantics of persons' behaviour?
It looks interesting! modulo the fact that I don't think Grothendieck knew anything about intuitionistic logic. It is Lawvere who introduced elementary toposes which generalize Grothendieck toposes and make clear the connection with intuitionistic (and not "intuitionist" :() logic...
I think I read something about this on the Internet but I don't remember where.
Nothing like an involuntary shiver of scepticism to wake you up in the morning. I know that I will end up reading this...