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src/HOL/Real/RealArith.ML
changeset 10574 8f98f0301d67
parent 9436 62bb04ab4b01
child 10648 a8c647cfa31f
equal deleted inserted replaced
10573:1751ab881289 10574:8f98f0301d67 
     1 
       
     2 (*useful??*)
 
     1 (*useful??*)
 
     3 Goal "(z = z + w) = (w = (#0::real))";
 
     2 Goal "(z = z + w) = (w = (#0::real))";
 
     4 by Auto_tac;
 
     3 by Auto_tac;
 
     5 qed "real_add_left_cancel0";
 
     4 qed "real_add_left_cancel0";
 
     6 Addsimps [real_add_left_cancel0];
 
     5 Addsimps [real_add_left_cancel0];
isabelle