thys/Rec_Def.thy
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     1 (* Title: thys/Rec_Def.thy
       
     2    Author: Jian Xu, Xingyuan Zhang, and Christian Urban
       
     3    Modifications: Sebastiaan Joosten
       
     4 *)
       
     5 
     1 theory Rec_Def
     6 theory Rec_Def
     2 imports Main
     7 imports Main
     3 begin
     8 begin
     4 
     9 
     5 datatype recf =  z
    10 datatype recf =  z