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29 November 2014

  • curprev 17:2617:26, 29 November 2014 82.123.174.158 talk 10,900 bytes +1,040 If an extension is equivalent to the trivial one, then it is a direct product. Prop 2 : http://books.google.fr/books?id=4RIDPH1ULXcC&pg=SA1-PA63#v=onepage&q&f=false

16 November 2013

14 May 2012