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The Redei-Berge function in noncommuting variables

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arxiv 2504.20968 v1 pith:6YJEB5WF submitted 2025-04-29 math.CO

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keywords functionredei-bergevariablesnoncommutingpropertysymmetricallowedallows
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Recently, Stanley and Grinberg introduced a symmetric function associated to digraphs, called the Redei-Berge symmetric function. This function, however, does not satisfy the deletion-contraction property, which is a very powerful tool for proving various identities using induction. In this paper, we introduce an analogue of this function in noncommuting variables which does have such property. Furthermore, it specializes to the ordinary Redei-Berge function when the variables are allowed to commute. This modification allows us to further generalize properties that are already proved for the original function and to deduce many new ones.

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  1. The connection between the chromatic function and the Redei-Berge function

    math.CO 2025-06 conditional novelty 6.0 of 10

    For every poset, the noncommutative chromatic function of its incomparability graph is the omega image of the noncommutative Redei-Berge function, making the two theories interchangeable.

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