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src/HOL/AxClasses/Group/MonoidGroupInsts.thy
author wenzelm
Wed, 10 Jun 1998 11:56:23 +0200
changeset 5020 e0f605038a9f
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added General;
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(*  Title:      MonoidGroupInsts.thy
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Some class inclusions or 'abstract instantiations'.













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*)













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MonoidGroupInsts = Group + Monoid +













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(* monoids are semigroups *)













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instance













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  monoid < semigroup            (Monoid.assoc)













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(* groups are monoids *)













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instance













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  group < monoid                (assoc, left_unit, right_unit)













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end















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