Bell numbers: Difference between revisions

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;Examples:
;So:
: &nbsp; '''B<sub>0</sub> = 1''' &nbsp; trivially. &nbsp; There is only one way to partition a set with zero elements: &nbsp; '''{ }'''
: &nbsp; '''B<sub>1</sub> = 1''' &nbsp; There is only one way to partition a set with one element: &nbsp; &nbsp; '''{a}'''