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Combinatorial interpretation of unsigned Stirling and Lah numbers. (English)
Pi Mu Epsilon J. 12, No. 7, 417-424 (2007).
From the introduction: In this paper we examine three families of numbers with interesting combinatorial interpretations. We use three basic combinatorial proof techniques: the bijective proof, the rule of summation, and the method of distinguished element.
Classification: K20
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