Hard to say. It happened only once for now (I've studied really hard that day - something like about 6 hours of reading and examples analyzing, also made some exercises), but I will check it next time
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Funny, that night after climbing a hyperplane I also had more concrete dreams, but they also were strange. For example, in one of them I was involved in rather strange form of art: I was hooking something which looked like chains of sausages (but it was not really sausages) to ceiling, and then we decided to move, and we tried to carry them over but they looked very poor being hooked off the ceiling...
Actually, after waking up I found this things were rather creepy. Now I suspect that it were actually f(x), and when we hooked them off, it became f'(x)
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