See < https://mathoverflow.net/questions/134652/foundations-of-mathematics-and-set-theory>, where the reasons for closing are slightly too relevant/not relevant at all. How many of these fields are there that we still need to fill in?

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See < https://mathoverflow.net/questions/134652/foundations-of-mathematics-and-set-theory>, where the reasons for closing are slightly too relevant/not relevant at all. How many of these fields are there that we still need to fill in?

tomorrow, so enjoy the new-old ones while you can... $\endgroup$