Theory Case_Product

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

section ‹Examples for the 'case_product' attribute›

theory Case_Product
imports Main

text ‹
  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.

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

text ‹The attribute honours preconditions.›

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

text ‹Also, case names are generated based on the old names.›