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when toggle format what by license comment
Oct 12, 2022 at 17:00 history edited Glorfindel CC BY-SA 4.0
broken link fixed, cf. https://meta.mathoverflow.net/q/5301/70594
Oct 14, 2010 at 20:47 comment added Sándor Kovács and right after the definition he says: "It should be remarked that this notion is not commonly accepted and that other authors use different definitions."
Aug 19, 2010 at 17:20 history answered Charles Siegel CC BY-SA 2.5