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1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1.
(1) (指事。 “一”是汉字部首之一。 本义:数词。 大写作“壹”。 最小的正整数。 常用以表示人或事、物的最少数量) (2) 同本义 [one] 一，惟初太始道立于一，造分天地，化成万物。 ——《说文》 一也者，万物之本也。
In mathematics, 1 is the multiplicative identity. It is sometimes called the "unity". [1] It is also the only number for which these special facts are true: Any number multiplied by 1 equals that number: .
在 概率論 中，任一 样本空間 中必然发生的 隨机事件 之 概率 定义为1。. 1是 正数 、 整数 、 有理数 、 代数数 、 實数 、复数。. 在 几何学 中， 单位圆 和 單位球 的 半徑 都是1。. 歐拉恆等式 ，. e i π + 1 = 0 {\displaystyle { { {e}^ { {i}\, {\pi }}}+ {1}}=0} ，把 数学 上 ...
1 ( one) is a number, numeral, and the glyph that represents the number. It represents a single entity and is commonly regarded as the fundamental unit of counting and measurement. For example, a line segment of "unit length" is a line segment of length 1. In mathematics, the number 1 is the natural number [1] that follows 0 and precedes 2.
1是 正数 、 整数 、 有理数 、 代数数 、 实数 、复数。. 在 几何学 中， 单位圆 和 单位球 的 半径 都是1。. 欧拉恒等式 ，. e i π + 1 = 0 {\displaystyle { { {e}^ { {i}\, {\pi }}}+ {1}}=0} ，把 数学 上五个重要的 常数 以简约的方式连系起来。.
One is known as the multiplicative identity or unit. UNIT. What does the number 1 look like? As the unit number, one is not composed of any other numbers and has no internal structure. 1 is an odd number which is uniquely neither prime nor composite. It is known as the multiplicative identity or unit.
