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(* -*- coding: utf-8 -*-
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ID: $Id$
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Author: Ning Zhang and Christian Urban
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Example theory involving Unicode characters (UTF-8 encoding) -- both
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formal and informal ones.
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*)
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header {* A Chinese theory *}
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17553
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theory Chinese imports Main begin
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17505
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text{* 数学家能把咖啡变成理论,如今中国的数学家也可
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以在伊莎贝拉的帮助下把茶变成理论.
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伊莎贝拉-世界数学家的新宠,现今能识别中文,成为
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中国数学家理论推导的得力助手.
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*}
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datatype shuzi =
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One ("一")
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| Two ("二")
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| Three ("三")
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| Four ("四")
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| Five ("五")
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| Six ("六")
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| Seven ("七")
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| Eight ("八")
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| Nine ("九")
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| Ten ("十")
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consts
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translate :: "shuzi \<Rightarrow> nat" ("|_|" [100] 100)
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primrec
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"|一| = 1"
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"|二| = 2"
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"|三| = 3"
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"|四| = 4"
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"|五| = 5"
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"|六| = 6"
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"|七| = 7"
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"|八| = 8"
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"|九| = 9"
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"|十| = 10"
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thm translate.simps
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lemma "|四| + |六| = |十|"
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by simp
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end
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