Generic horofunction boundary conjecture for infinite Sierpinski polygon graphs

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

S:={s∈Vr∣s≠j 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 s∈Ss\in S, then there are two Busemann points; moreover, in each of the three cases

j+r−f(r)2≤s≤j+r+f(r)2,s<j+r−f(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.

References

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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