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Mar 3, 2015 at 13:43 vote accept Dominic van der Zypen
Mar 3, 2015 at 13:30 history edited jmc CC BY-SA 3.0
added 9 characters in body
Mar 3, 2015 at 13:29 comment added jmc @DominicvanderZypen — You are right, I made a typo. I'll fix it. Bjørn's answer is correct (and more concise.)
Mar 3, 2015 at 12:56 comment added Dominic van der Zypen Hang on - $t$ and $\{x\}\cup t$ are comparable, so $B$ is no longer a bunch, isn't it...? (Thanks to Joel Adler for noticing this.)
Mar 2, 2015 at 9:05 vote accept Dominic van der Zypen
Mar 3, 2015 at 12:55
Mar 2, 2015 at 8:57 history answered jmc CC BY-SA 3.0