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Prefix_subtract.thy
changeset 149 e122cb146ecc
parent 31 b6815473ee2e
child 162 e93760534354
equal deleted inserted replaced
148:3b7477db3462 149:e122cb146ecc 
     1 theory Prefix_subtract
 
     1 theory Prefix_subtract
 
     2   imports Main List_Prefix
 
     2   imports Main 
       
     3           "~~/src/HOL/Library/List_Prefix"
 
     3 begin
 
     4 begin
 
     4 
     5 
     5 section {* A small theory of prefix subtraction *}
 
     6 section {* A small theory of prefix subtraction *}
 
     6 
     7 
     7 text {*
 
     8 text {*
regexp