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Apr 20, 2020 at 7:40 vote accept Jiayi Liu
Apr 20, 2020 at 7:33 vote accept Jiayi Liu
Apr 20, 2020 at 7:40
Apr 19, 2020 at 12:16 answer added Johannes Schürz timeline score: 3
Apr 19, 2020 at 4:54 comment added Jiayi Liu It is "for some $s<r$". Thanks~
Apr 19, 2020 at 4:53 history edited Jiayi Liu CC BY-SA 4.0
added 1 character in body
Apr 18, 2020 at 14:26 comment added Dan Turetsky In 2, did you mean for some $s < r$, rather than all $s < r$? Because as it is now, making $r$ larger makes it harder for such a $Q$ to exist, and so your argument for $r=1$ settles the question.
Apr 18, 2020 at 12:40 history asked Jiayi Liu CC BY-SA 4.0