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when toggle format what by license comment
May 13, 2021 at 10:40 vote accept Xin Zhang
May 13, 2021 at 2:59 comment added Gordon Royle In addition, some people call it a 2-distance $k$-colouring, which seems odd to me.
May 13, 2021 at 1:03 history edited Tony Huynh CC BY-SA 4.0
added 2 characters in body
May 13, 2021 at 0:56 history answered Tony Huynh CC BY-SA 4.0