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src/HOL/AxClasses/Tutorial/MonoidGroupInsts.thy
author wenzelm
Fri, 25 Apr 1997 14:12:33 +0200
changeset 3051 30490aa41356
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misc tuning;
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(*  Title:      HOL/AxClass/Tutorial/MonoidGroupInsts.thy
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Add derived class inclusions monoid < semigroup and group < monoid to













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type signature -- some kind of 'abstract instantiations'.













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*)













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MonoidGroupInsts = Monoid + Group +













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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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