Foata transform conjecture for spots of unit interval parking functions

From papers

Let α\alpha be a unit interval parking function, let FF denote the Foata transform, and let spotα\operatorname{spot}_\alpha denote the outcome permutation of α\alpha. Foata transform conjecture. For any unit interval parking function α\alpha,

spotF(α)=F(spotα).\operatorname{spot}_{F(\alpha)}=F(\operatorname{spot}_\alpha).

The conjecture concerns how the Foata transform acts on the outcome of a parking function. It has been verified in the source for all unit interval parking functions of length at most 88, but remains open in general.

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Sources & referencesView supporting material

Primary source

Kyle Celano, Jennifer Elder, Kimberly P. Hadaway, Pamela E. Harris, Jeremy L. Martin, Amanda Priestley and Gabe Udell, “Statistics on -interval parking functions”, arXiv:2507.07243 (2025).

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