由阿拉伯数字1表示的数字；等于该基数的数值
由阿拉伯数字1表示的数字；等于该基数的数值
由阿拉伯数字1表示的数字；等于该基数的数值
The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
自然数集中第一个正数
The first positive number in the set of natural numbers.
最小非空集合的基数
The cardinality of the smallest nonempty set.
没有前驱的元素的序数,通常称为第一或一号
The ordinality of an element which has no predecessor, usually called first or number one.
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