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Pierre Hérigone (Latinized as Petrus Herigonius) (1580–1643) was a French mathematician and astronomer. Of Basque origin, Hérigone taught in Paris for most of his life. ==Works== Only one work by Hérigone is known to exist: ''Cursus mathematicus, nova, brevi, et clara methodo demonstratus, per notas reales et universales, citra usum cujuscunque idiomatis intellectu faciles'' (published in Paris in six volumes from 1634 to 1637; second edition 1644), a compendium of elementary mathematics written in French and Latin. The work introduced a system of mathematical and logical notation. It has been said that "Hérigone introduced so many new symbols in this six-volume work that some suggest that the introduction of these symbols, rather than an effective mathematics text, was his goal."〔http://members.aol.com/jeff570/geometry.htm〕 Florian Cajori has written that the work contains "a full recognition of the importance of notation and an almost reckless eagerness to introduce an exhaustive set of symbols..."〔http://www.fuchu.or.jp/~d-logic/en/uni.html 〕 Hérigone may have been the first to introduce the mathematical symbol to express an angle. He used both the symbol below and recorded the use of "<" as a symbol denoting "less than." He also introduced the upside-down "T" symbol to express perpendicularity. In regards to the notation for exponents, Herigone wrote a, a2, a3, etc. (though the numerals were not raised, however, as they are today). Hérigone also created a number alphabet for remembering long numbers in which phonemes were assigned to different numbers, while the vowels were supplied by the memorizer: 1 (t, d), 2 (n), 3 (m), 4 (r), 5 (l), 6 (j, ch, sh), 7 (c, k, g), 8 (f, v, ph), 9 (p, b), 10 (z, s). (see article Herigone's mnemonic system). In Hérigone's work, we find the earliest written examples of mathematical terms. ''Parallelipipedon'', an archaic form of ''parallelepiped'', appears in an English work dated 1570. Hérigone himself used the spelling ''parallelepipedum''. 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「Pierre Hérigone」の詳細全文を読む スポンサード リンク
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