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Fungrim entry: 3627de

B2=#{{{1},{2}},{{1,2}}}=2B_{2} = \# \left\{\left\{\left\{1\right\}, \left\{2\right\}\right\}, \left\{\left\{1, 2\right\}\right\}\right\} = 2
Definitions:
Fungrim symbol Notation Short description
BellNumberBnB_{n} Bell number
Cardinality#S\# S Set cardinality
Source code for this entry:
Entry(ID("3627de"),
    Equal(BellNumber(2), Cardinality(Set(Set(Set(1), Set(2)), Set(Set(1, 2)))), 2))

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2021-03-15 19:12:00.328586 UTC