src/HOL/Algebra/abstract/PID.thy
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beautified spacing for binders with symbols syntax, analogous to HOL.thy
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(*
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    Principle ideal domains
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    $Id$
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    Author: Clemens Ballarin, started 5 October 1999
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*)
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PID = Ideal +
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instance
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  pid < factorial	(TrueI, pid_irred_imp_prime)
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end
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