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Jul 13, 2018 at 4:46 comment added Fan Zheng Thanks, and @PiotrHajlasz also gets my upvote.
Jul 13, 2018 at 4:45 comment added Ivo Terek And I upvoted both. Everybody gets points!
Jul 13, 2018 at 4:42 comment added Piotr Hajlasz OK. But your answer was accepted, not mine :( and upvoted by me :)
Jul 13, 2018 at 4:42 comment added Ivo Terek @Piotr Probably because you answered a couple of seconds before. The reference is very interesting, since I'm still learning the subject. I'm accepting Fan's proof since it's very straightforward. Thanks a lot you both. :)
Jul 13, 2018 at 4:41 comment added Fan Zheng @PiotrHajlasz I am just saying that you answered 1 min faster than me, with essentially the same proof :)
Jul 13, 2018 at 4:40 vote accept Ivo Terek
Jul 13, 2018 at 4:38 comment added Piotr Hajlasz What do you mean?
Jul 13, 2018 at 4:36 comment added Fan Zheng Piotr Hajlasz beat me to it.
Jul 13, 2018 at 4:34 history answered Fan Zheng CC BY-SA 4.0