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src/HOL/ex/Case_Product.thy
author haftmann
Thu, 19 Jun 2025 17:15:40 +0200
changeset 82734 89347c0cc6a3
parent 65563 e83c9e94e891
permissions -rw-r--r--
treat map_filter similar to list_all, list_ex, list_ex1

(*  Title:      HOL/ex/Case_Product.thy
    Author:     Lars Noschinski
    Copyright   2011 TU Muenchen
*)

section \<open>Examples for the 'case_product' attribute\<close>

theory Case_Product
imports Main
begin

text \<open>
  The @{attribute case_product} attribute combines multiple case distinction
  lemmas into a single case distinction lemma by building the product of all
  these case distinctions.
\<close>

lemmas nat_list_exhaust = nat.exhaust [case_product list.exhaust]

text \<open>The attribute honours preconditions.\<close>

lemmas trancl_acc_cases = trancl.cases [case_product acc.cases]

text \<open>Also, case names are generated based on the old names.\<close>

end
isabelle