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arxiv: 1904.03984 · v1 · pith:DKG52BU6new · submitted 2019-04-08 · 🧮 math.DS

Commuting circle diffeomorphisms with their derivatives having mixed moduli of continuity

classification 🧮 math.DS
keywords omegacdotscontinuitymodulicirclediffeomorphismsclasscommute
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Let $d\geq 2$ be an integer and let $\omega_1,\cdots ,\omega_d$ be moduli of continuity in a specified class which contains the moduli of H\"{o}lder continuity. Let $f_k$, $k\in\{1,\cdots,d\}$, be $C^{1+\omega_k}$ orientation preserving diffeomorphisms of the circle and $f_1,\cdots, f_d$ commute with each other. We prove that if the rotation numbers of $f_k$'s are independent over the rationals and $\omega_1(t)\cdots\omega_d(t)=t\omega(t)$ with $\lim_{t\rightarrow 0^+}\omega(t)=0$, then $f_1,\cdots,f_d$ are simultaneously (topologically) conjugate to rigid rotations.

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