Thu, 12 Apr 2012 23:07:01 +0200 krauss Set_Algebras: removed syntax \<oplus> and \<otimes>, in favour of plain + and *
Thu, 12 Apr 2012 22:55:11 +0200 krauss removed "setsum_set", now subsumed by generic setsum
Thu, 12 Apr 2012 19:58:59 +0200 krauss backported Set_Algebras to use type classes (basically reverting b3e8d5ec721d from 2008)
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