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Feb 17, 2014 at 19:04 comment added Johannes Hahn @MartinBrandenburg You could have just written the standard proof of such things: "Exercise for the reader" ;-)
Oct 17, 2013 at 5:19 vote accept pre-kidney
Oct 14, 2013 at 9:12 comment added Martin Brandenburg Note to myself: Answers without proof are the most popular ones.
Oct 13, 2013 at 0:18 comment added Stefan Hamcke They are also the extremal monics/epics :-)
Oct 12, 2013 at 23:41 history answered Martin Brandenburg CC BY-SA 3.0