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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 The Whetstone of Witte ： ウィキペディア英語版 The Whetstone of Witte ''The Whetstone of Witte'' is the shortened title of Robert Recorde's mathematics book published in 1557, the full title being ''The whetstone of witte, whiche is the seconde parte of Arithmetike: containyng thextraction of Rootes: The ''Coßike'' practise, with the rule of ''Equation'': and the woorkes of ''Surde Nombers. The book covers topics including whole numbers, the extraction of roots and irrational numbers.〔.〕 The work is notable for containing the first recorded use of the equals sign〔.〕 and also for being the first book in English to use the plus and minus signs.〔.〕 Recordian notation for exponentiation, however, differed from the later Cartesian notation $p^q\; =\; p\; \backslash times\; p\; \backslash times\; p\; \backslash cdots\; \backslash times\; p$. Recorde expressed indices and surds larger than 3 in a systematic form based on the prime factorization of the exponent: a factor of two he termed a ''zenzic'', and a factor of three, a ''cubic''. Recorde termed the larger prime numbers appearing in this factorization ''sursolids'', distinguishing between them by use of ordinal numbers: that is, he defined 5 as the ''first sursolid'' and 7 as the ''second sursolid''.〔, p. 180.〕 He also devised symbols for these factors: a zenzic was denoted by z, and a cubic by &. For instance, he referred to ''p8=p2×2×2'' as ''p''zzz (the zenzizenzizenzic of ''p''), and ''q12=q2×2×3'' as ''q''zz& (the zenzizenzicubic of ''q'').〔, p. 184.〕 ==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「The Whetstone of Witte」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.