src/HOL/Integ/IntRingDefs.ML
author wenzelm
Thu Jan 23 14:19:16 1997 +0100 (1997-01-23)
changeset 2545 d10abc8c11fb
parent 2281 e00c13a29eda
child 4423 a129b817b58a
permissions -rw-r--r--
added AxClasses test;
     1 (*  Title:      HOL/Integ/IntRingDefs.thy
     2     ID:         $Id$
     3     Author:     Tobias Nipkow and Markus Wenzel
     4     Copyright   1996 TU Muenchen
     5 
     6 *)
     7 
     8 open IntRingDefs;
     9 
    10 goalw thy [zero_int_def,zdiff_def] "(zero-x)+(x::int) = zero";
    11 by(Simp_tac 1);
    12 qed "left_inv_int";
    13 
    14 goalw thy [zero_int_def,zdiff_def] "x-y = (x::int) + (zero-y)";
    15 by(Simp_tac 1);
    16 qed "minus_inv_int";