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Stuff having to do with the metric of a Hilbert space seems like the most advanced thing I've come across. On the other hand, there was this Swedish math problem that said, "I want my wife to have Tooker's baby instead of my own, I guess my semen just sucks compared to his, but I'm not going to ask him to get my wife pregnant the old fashioned way because that would disrupt the cuckold theater put in place by those who are stealing and selling his semen. So, since the thought of my wife getting pregnant by my own semen is so unpalatable to me, and to her too probably, I'll just throw my lot in with those who are stealing Tooker's semen and then hope he doesn't hit my whole extended family with genocide for it later on. That's way smarted than asking him to get my wife pregnant." Maybe that was like, type-2 category theory or something. It was pretty simple compared to the metric of Hilbert space.