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правок
Изменения
→Литература
==Литература==
*[http://www.tex.ucsd.edu/~ebender/CombText/ch-11.pdf Bender Edward A.Williamson, S. Gill, Set Partitions, 319–320, 2006]
* [[https://en.wikipedia:Bell numbers| .org/wiki/Bell_number Bell numbers]]
*Nobuhiro Izumi Hui-Hsiung "Acta Applicandae Texematicae",79–87.Bell numbers, log-concavity, and log-convexity 2000
*Aitken A. C. Edinburgh Texematical Notes,18–23 A problem in combinations 1933
