src/HOL/ex/Chinese.thy

no longer declare .psimps rules as [simp].

This regularly caused confusion (e.g., they show up in simp traces
when the regular simp rules are disabled). In the few places where the
rules are used, explicitly mentioning them actually clarifies the
proof text.

(* -*- coding: utf-8 -*- :encoding=utf-8:
    Author:     Ning Zhang and Christian Urban

Example theory involving Unicode characters (UTF-8 encoding) -- both
formal and informal ones.
*)

header {* A Chinese theory *}

theory Chinese imports Main begin

text{* 数学家能把咖啡变成理论,如今中国的数学家也可
       以在伊莎贝拉的帮助下把茶变成理论.  

       伊莎贝拉-世界数学家的新宠,现今能识别中文,成为
       中国数学家理论推导的得力助手.

    *}

datatype shuzi =
    One   ("一")
  | Two   ("二")
  | Three ("三") 
  | Four  ("四")
  | Five  ("五")
  | Six   ("六")
  | Seven ("七")
  | Eight ("八")
  | Nine  ("九")
  | Ten   ("十")

primrec translate :: "shuzi \<Rightarrow> nat" ("|_|" [100] 100) where
 "|一| = 1"
|"|二| = 2"
|"|三| = 3"
|"|四| = 4"
|"|五| = 5"
|"|六| = 6"
|"|七| = 7"
|"|八| = 8"
|"|九| = 9"
|"|十| = 10"

thm translate.simps

lemma "|四| + |六| = |十|"
  by simp 

end