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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
May 15, 2011 at 11:11 vote accept Martin Brandenburg
Apr 11, 2011 at 21:38 comment added Martin Brandenburg Oh, you're right! Please edit it as you wish ;).
Apr 10, 2011 at 12:55 comment added darij grinberg Sorry, but shouldn't we require $p(rt)=rp(t)$ for every $r\in R$ as well?
Apr 10, 2011 at 12:49 answer added Neil Strickland timeline score: 3
Apr 10, 2011 at 9:19 history edited Martin Brandenburg CC BY-SA 3.0
added 463 characters in body; edited body
Apr 10, 2011 at 9:04 history asked Martin Brandenburg CC BY-SA 3.0