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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Low and high hierarchies ： ウィキペディア英語版 Low and high hierarchies In the computational complexity theory, the low hierarchy and high hierarchy of complexity levels were introduced in 1983 by Uwe Schöning to describe the internal structure of the complexity class NP. The low hierarchy starts from complexity class P and grows "upwards", while the high hierarchy starts from class NP and grows "downwards". 〔"Complexity Theory and Cryptology", by Jörg Rothe (p. 232 )〕 Later these hierarchies were extended to sets outside NP. The framework of high/low hierarchies makes sense only under the assumption that P is not NP. On the other hand, if the low hierarchy consists of at least two levels, then P is not NP.〔Lane A. Hemaspaandra, "Lowness: a yardstick for NP-P", ''ACM SIGACT News'', 1993, vol. 24, no.2, pp. 11-14. 〕 It is not known whether these hierarchies cover all NP. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Low and high hierarchies」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.