2003-03-10 ballarin First distributed version of Group and Ring theory.
2003-03-10 paulson New theory ProgressSets. Definition of closure sets
2003-03-10 paulson spelling
2003-03-06 paulson new UNITY examples theory
2003-03-06 paulson new logical equivalences
2003-03-06 paulson new simprule for int (nat n)
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