Inner-corner obstruction conjecture for four-dimensional polydisks

Let β\beta be a polydisk parameter, and let E^k+1\hat{\mathbf{E}}_{k+1} and Ek+1\mathbf{E}_{k+1} be the inner and outer obstruction classes defined in the paper. Their obstruction graphs intersect at

I^k+1=(z^k+1in,λ^k+1in).\hat I_{k+1}=(\hat z^{\mathrm{in}}_{k+1},\hat\lambda^{\mathrm{in}}_{k+1}).

Here cβc_\beta is the polydisk embedding function.

Inner-corner obstruction conjecture. At these intersections,

cβ(z^k+1in)λ^k+1in.c_\beta(\hat z^{\mathrm{in}}_{k+1})\leq\hat\lambda^{\mathrm{in}}_{k+1}.

Together with the established complementary lower and upper bounds, this conjecture would fully compute cβc_\beta on the interval [1,accum(β)][1,\mathrm{accum}(\beta)]. The source notes that complications remain in a potential proof.

Sources & referencesView supporting material

Primary source

Caden Farley, Tara Holm, Nicki Magill, Jemma Schroder, Morgan Weiler, Zichen Wang and Elizaveta Zabelina, “Four-periodic infinite staircases for four-dimensional polydisks”, arXiv:2210.15069 (2023).

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