Also called a positive number. A real number greater than 0. The square of a non-zero real number a x 2 is a positive number, and conversely, a positive number can be expressed as the square of a non-zero real number. Real numbers less than 0, that is, numbers of the form (positive number) x (-1), are negative numbers, and furthermore, (positive number) x (positive number) and (negative number) x (negative number) are positive numbers, and (positive number) x (negative number) is a negative number. [Nagata Masayoshi] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
正数ともいう。0より大きい実数のことである。0でない実数aの平方a2は正の数であり,逆に正の数は0でない実数の平方で表される。0より小さい実数,すなわち,(正の数)×(-1)の形の数は負の数であり,さらに(正の数)×(正の数),(負の数)×(負の数)は正の数,(正の数)×(負の数)は負の数になる。【永田 雅宜】
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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