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  • 1 - Wikipedia
    1 (one, unit, unity) is a number, numeral, and glyph It is the first and smallest positive integer of the infinite sequence of natural numbers
  • 1(自然数之一)_百度百科
    1是一个 自然数,是最小的 正整数,是最小的正 奇数。 1是一个 有理数,是一位数,也是 奇数。 1既不是 质数 也不是 合数。 1的n 次方 (n∈R)都等于1。 1的 倒数 是它本身。 一个或者几个 事物 所组成的 整体,可以看作是 单位 “1”。 中文名 一 外文名
  • 1 - 维基百科,自由的百科全书
    1 (中文也作 一)是一个 数字 、 数词 和 符号。 它是 自然数 无限序列中第一个也是最小的 正整数。 这一基本属性使其在其他领域中具有独特用途,从科学到体育,通常表示一个群体中的第一个、领先或顶尖的事物。 1是计数或 测量 的单位,单数名词的限定词,以及中性代词。 历史上1的表示形式从 古苏美尔 和 巴比伦 符号演变为现代 阿拉伯数字。 在数学中,1为乘法单位元,即任何数字与1相乘皆等于其本身。 按照惯例,1不被视为素数。 在数字电路中,1表示 二进制 中的“开启”状态,是计算技术的基础。 在 哲学 领域,1在诸多传统中象征着终极现实或存在的本源。 数字1是 0 之后之首个 自然数。 每一自然数,含1,皆由后继法构造,即于前一自然数加1而成。
  • 为什么 1 不能被认为是质数? - 知乎
    1原本是作为质数的,因为它本身满足质数的定义(1只可以被1和它本身整除)。 1之所以被排除质数的范围,是因为我们有如下定理:
  • 1 (number) - Simple English Wikipedia, the free encyclopedia
    One (1) is the first natural number, followed by two The Roman numeral for one is I In mathematics, the number one is the multiplicative identity [1] It is also the only number for which these special facts are true: Any number multiplied by one equals that number: For example, Any number divided by one equals that number: For example,
  • 1 (number) - New World Encyclopedia
    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 -- from Wolfram MathWorld
    The number one (1), also called "unity," is the first positive integer It is an odd number Although the number 1 used to be considered a prime number, it requires special treatment in so many definitions and applications involving primes greater than or equal to 2 that it is usually placed into a class of its own (Wells 1986, p 31)
  • What Is 1? Definition, Facts Examples for Kids - Vedantu
    One is a number in Mathematics that represents the quantity or the value of 1 While counting, the number 1 is succeeded by 2 which is then succeeded by 3 and so on Before learning some interesting facts about the number 1, let us look into what a number is




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