Bell number

短语

词形变化

Bell numbers 复数 Bell numbers

释义与例句

n.
  1. 1.

    Any member of a sequence of numbers that count the possible partitions of a set, such that the nth number Bₙ is the number of different ways to partition a set that has exactly n elements.

    数学

词源

Named after Eric Temple Bell, who wrote about them in the 1930s.

来源：wiktionary