Tue, 22 Mar 2011 21:22:50 +0100 wenzelm merged
Tue, 22 Mar 2011 20:06:10 +0100 hoelzl standardized headers
Tue, 22 Mar 2011 18:53:05 +0100 hoelzl generalized Caratheodory from algebra to ring_of_sets
Tue, 22 Mar 2011 16:44:57 +0100 hoelzl add ring_of_sets and subset_class as basis for algebra
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