Generic horofunction boundary conjecture for infinite Sierpinski polygon graphs

Let Γξ\Gamma_\xi be an infinite Sierpinski polygon graph that grows away from the vertex jj. Define

S:={sVrsj and sj occurs infinitely many times in ξ}.S:=\{s\in V_r\mid s\neq j\text{ and }sj\text{ occurs infinitely many times in }\xi\}.

Generic horofunction boundary conjecture. If SS is empty, the horofunction boundary is as in the stated theorem: it has exactly two Busemann points and countably many non-Busemann points. If sSs\in S, then there are two Busemann points; moreover, in each of the three cases

j+rf(r)2sj+r+f(r)2,s<j+rf(r)2,s>j+r+f(r)2,j+\frac{r-f(r)}{2}\leq s\leq j+\frac{r+f(r)}{2},\qquad s<j+\frac{r-f(r)}{2},\qquad s>j+\frac{r+f(r)}{2},

there exist countably many non-Busemann points, and the three cases produce different non-Busemann points.

This is proposed as a generalization of the preceding theorem from the special sequence ξ=wj\xi=wj^\infty to generic sequences defining graphs that grow away from jj. The parser supplies no evidence that the proposed generalization has been proved or disproved.

Sources & referencesView supporting material

Primary source

Daniele D'Angeli, Francesco Matucci, Davide Perego and Emanuele Rodaro, “Horofunctions of infinite Sierpinski polygon graphs”, arXiv:2507.23681 (2025).

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