Thu, 13 Aug 1998 18:07:56 +0200 paulson tidying
Thu, 13 Aug 1998 18:07:38 +0200 paulson Moved the definition of s_u (as s) into the locale
Thu, 13 Aug 1998 18:06:40 +0200 paulson Constrains, Stable, Invariant...more of the substitution axiom, but Union
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