I have no idea how many PhD's have spent how much time of their careers tackling these very specific problems, and I doubt you do either.
replyI'm trying to understand if these specific problems were the kinds of problems that would have justified an expert investing weeks or months to solve. Or if they were the kinds of problems that would normally have been given to students to investigate.
They are significant problems which experts have spent months or years studying. I heard a mathematician say that resolving non-sofic groups and Connes's rigidity would be career-defining for a mathematician.
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