src/HOL/Real/RealAbs.thy
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(*  Title       : RealAbs.thy
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    ID          : $Id$
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    Author      : Jacques D. Fleuriot
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    Copyright   : 1998  University of Cambridge
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    Description : Absolute value function for the reals
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*) 
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RealAbs = RealArith +
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defs
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  real_abs_def "abs r == (if (0::real) <= r then r else -r)"
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end