The metric conjecture for the Teichmüller-type space of routes to chaos

For each route to chaos CC, let [C][C] be its boundary, namely the collection of limit dilatations of sequences drawn from the dilatation sets of the stages of CC. Let TchaosT_{chaos} be the collection of all such boundaries, and define

d([C],[C])=inf{ln(K(f1g)):f[C], g[C]}.d([C],[C'])=\inf\{\ln(K(f^{-1}\circ g)): f\in[C],\ g\in[C']\}.

The function dd is already known in the paper to be symmetric and to satisfy the triangle inequality. Metric conjecture. dd is a metric on TchaosT_{chaos}. This strengthens the established pseudometric properties by asserting that distinct points have positive distance; the paper proposes a Teichmüller-theoretic approach but does not resolve the claim.

Sources & referencesView supporting material

Primary source

Eran Igra and Valerii Sopin, “Period-Doubling Cascades Invariants: Braided Routes To Chaos”, arXiv:2504.07572 (2025).

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