Abstract
Functional equations with one catalytic variable appear in several combinatorial applications, most notably in the enumeration of lattice paths and in the enumeration of planar maps. The main purpose of this paper is to show that under certain positivity assumptions, the dominant singularity of the solution has a universal behavior. We have to distinguish between linear catalytic equations, where a dominating square root singularity appears, and non-linear catalytic equations, where we—usually—have a singularity of type 3/2.
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We thank the referees for their careful reading and their valuable comments for improving the presentation.
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This study was supported by FWF (Grant Nos. F50-02, F55-02, and P35016).
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Drmota, M., Hainzl, EM. Universal Asymptotic Properties of Positive Functional Equations with One Catalytic Variable. La Matematica 2, 692–742 (2023). https://doi.org/10.1007/s44007-023-00063-0
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DOI: https://doi.org/10.1007/s44007-023-00063-0