Conjecture on occurrence sequences in base-phi expansions

Let β(N)=β+(N)β(N)\beta(N)=\beta^+(N)\cdot\beta^-(N) be the base-phi expansion of the number NN. Let ww be a word of length mm, and let RwR_{\cdot w} be the sequence of occurrences of numbers NN whose first mm digits of β(N)\beta^-(N) are ww, namely

d1dm(N)=w.d_{-1}\dots d_{-m}(N)=w.

Let VFV_{\rm F}, VGV_{\rm G}, and VHV_{\rm H} denote the families of sequences whose first differences are respectively the fixed points of the morphisms ff, gg, and hh, with arbitrary integer first element. Occurrence-sequence conjecture. There exist two Lucas numbers aa and bb such that RwR_{\cdot w} is one of VFV_{\rm F}, VGV_{\rm G}, or VHV_{\rm H}. Alternatively, RwR_{\cdot w} is a union of three sequences of these types. This conjecture proposes a uniform description of occurrence sequences arising from prefixes of the negative part of base-phi expansions; the paper's preceding examples motivate the three fixed-point families, but the supplied text gives no resolution.

Sources & referencesView supporting material

Primary source

F. Michel Dekking, “The structure of base phi expansions”, arXiv:2305.08349 (2023).

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