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July 13, 2016
May 12, 2008
December 7, 2007
this isn't actually the general form, but I don't think the differential form contributes a whole lot for a high school level encyclopedia
m+15
clarity
m-6
formatting, wikilink
+9
Undo revision 346396 by Special:Contributions/BillOhannity (User talk:BillOhannity) no indication of copyright...?
m+1,309