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src/HOL/BCV/SemiLattice.thy
author paulson
Thu, 11 Nov 1999 10:25:17 +0100
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5997f35954d7 A new theory: a model of bytecode verification.
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(*  Title:      HOL/BCV/SemiLattice.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1999 TUM
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Semilattices













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*)













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SemiLattice = Plus +













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constdefs













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 semilat :: "('a::{order,plus} set) => bool"













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"semilat A == (!x:A. !y:A. x <= x+y)  &













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          (!x:A. !y:A. y <= x+y)  &













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          (!x:A. !y:A. !z:A. x <= z & y <= z --> x+y <= z) &













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          (!x:A. !y:A. x+y : A)"













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end















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