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[4] These numbers may be computed via a summation formula involving binomial coefficients, or by using a recurrence relation. They also count combinatorial objects that have a bijective correspondence to the weak orderings, such as the ordered multiplicative partitions of a squarefree number [5] or the faces of all dimensions of a permutohedron ...
VB 10 or Van Biesbroeck's star / v æ n ˈ b iː z b r ʊ k / [7] is a small and dim red dwarf [2] located in the constellation Aquila. It is part of a binary star system. VB 10 is historically notable as it was the least luminous and least massive known star from its discovery in 1944, until 1982 when LHS 2924 was shown to be less luminous. [ 8 ]