Decreasing intersection quotients characterize quasi-geodesic origami edge-paths

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Let α\alpha and β\beta be the endpoints of an origami edge-path

{α=α0,…,αn>2=β}.\{\alpha=\alpha_0,\ldots,\alpha_{n>2}=\beta\}.

Assume that the successive intersection quotients satisfy

∣β∩α1∣∣α∩α1∣>∣β∩α2∣∣α∩α2∣>⋯>∣β∩αn∣∣α∩αn∣.\frac{|\beta\cap\alpha_1|}{|\alpha\cap\alpha_1|}>\frac{|\beta\cap\alpha_2|}{|\alpha\cap\alpha_2|}>\cdots>\frac{|\beta\cap\alpha_n|}{|\alpha\cap\alpha_n|}.

Intersection-quotient conjecture. Under this condition, the edge-path is a quasi-geodesic.

The quotients can be viewed as slopes in the flat structure determined by the (α,β)(\alpha,\beta)-origami. Strict decrease is intended to prevent zig-zagging near a geodesic. The source gives no resolution of the conjecture.

References

Primary source

Hong Chang, Xifeng Jin and William W. Menasco, “Origami edge-paths in the curve graph”, arXiv:2008.09179 (2021).

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