Definition talk:Dynkin System

Minor point
Does anyone now why it is a "Dynkin system on (a set) $X$" but a "$\sigma$-algebra over $X$"? –Abcxyz (talk | contribs) 10:55, 25 March 2012 (EDT)


 * No; in fact, I have quite consistently been using the phrase '$\sigma$-algebra on $X$'. --Lord_Farin 11:00, 25 March 2012 (EDT)