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单词 aleph null
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aleph null
aleph null n. Mathematics the smallest infinite cardinal number; the number of positive integers (1, 2, 3,… ).
ΚΠ
1903 Proc. London Math. Soc. 14 May 243 Cantor uses the notation ℵ1 or Aleph-eins for the potency of his numbers of the first potency, while ℵ0 or Aleph-null denotes the potency of a countable set of points; this notation we shall keep.
1979 Sci. Amer. Nov. 29/2 There is no infinite number between aleph-null (the number of positive integers) and aleph-one (the number of real numbers).
2007 W. Byers How Mathematicians Think iv. 163 Countable infinity is the cardinality of the counting numbers. It is usually represented by the symbol ℵ0, aleph null.
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