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A Note on a Theorem of Moser and Whitney
Published online by Cambridge University Press: 20 November 2018
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In a recent paper [1], L. Moser and E.L. Whitney have proved the following.
Theorem: The number of compositions of n into parts=1, 2, 4 or 5 (mod 6) and involving an even number of parts=4 or 5 (mod 6) exceeds by n the number of compositions of n into parts=1, 2, 4 or 5 (mod 6) and involving an odd number of parts=4 or 5 (mod 6).
Their method of proof utilizes the notion of weighted compositions and the method of generating series. They remark that they have not been able to find a direct combinatorial proof. The purpose of this note is to give a direct proof of a more general result.
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- Copyright © Canadian Mathematical Society 1962