CMI 2000, The Millennium Prize Problems2026·Problem sheetThe Millennium Meeting, Paris, 24 May 2000, at which the seven problems were announced.000
Fun example: empty colimit does not commute with empty limit2026·Notes·Bogdan ZavyalovWhy the definition of a filtered category insists on non-emptiness: the empty colimit fails to commute with the empty limit, and that is the only failure.000