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14 July 2014

7 November 2013

10 October 2013

  • 12:4212:42, 10 October 2013 diff hist −38 Prime ideal This doesn't need citation, it follows easily from the definitions: if ab is in the union, then ab is in some element of the chain, so one of a or b is in some element of the chain and thus in the union.

9 April 2013

14 April 2011

5 August 2009

20 March 2009

2 February 2009

10 November 2008

4 November 2008