...For example, the number 7 is considered a mystical number because, in addition to the fact that it corresponds to 1/4 of the lunar cycle, it is also the largest prime number among the natural numbers up to 10, and is difficult to divide and difficult to handle mathematically. The Pythagoreans, who believed that the universe is governed by numbers, regarded the tetraktys, a graphic representation of the four natural numbers from 1 to 4 and their sum, 10, as sacred. They considered 10 to be the unit of existence that completes a cycle of creation, the end, life and death, and they even attempted to treat illnesses with music, which embodies the power of numbers. ... *Some of the terminology explanations that mention "tetraktys" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…例えば7が神秘な数とされるのは,月齢周期の1/4に一致する事実に加え,10までの自然数のうち最大の素数であり,分割しがたく計算上も取り扱いにくいという性質に由来するといわれる。宇宙は数により支配されるとしたピタゴラス学派は,1から4までの4自然数とその合計である10を図形化したテトラクテュスtetraktysを神聖視した。彼らは創造と終末,生と死を一巡する存在の単位を10と考え,また数の力を具体化させた音楽によって病気の治療をも試みたという。… ※「tetraktys」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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