src/HOL/ex/Case_Product.thy
author noschinl
Wed Feb 23 11:23:26 2011 +0100 (2011-02-23)
changeset 41828 d5b294734373
child 58889 5b7a9633cfa8
permissions -rw-r--r--
add example for case_product usage
     1 (*  Title:      HOL/ex/Case_Product.thy
     2     Author:     Lars Noschinski
     3     Copyright   2011 TU Muenchen
     4 *)
     5 
     6 header {* Examples for the 'case_product' attribute *}
     7 
     8 theory Case_Product
     9 imports Main
    10 begin
    11 
    12 text {*
    13   The {@attribute case_product} attribute combines multiple case distinction
    14   lemmas into a single case distinction lemma by building the product of all
    15   these case distinctions.
    16 *}
    17 
    18 lemmas nat_list_exhaust = nat.exhaust[case_product list.exhaust]
    19 
    20 text {*
    21   The attribute honors preconditions
    22 *}
    23 
    24 lemmas trancl_acc_cases= trancl.cases[case_product acc.cases]
    25 
    26 text {*
    27   Also, case names are generated based on the old names
    28 *}
    29 
    30 end