Continuity conjecture for the Rényi entropy rate at order one

From papers

Let Z={Zn}n=1Z=\{Z_n\}_{n=1}^{\infty} be a stationary ergodic process over a finite alphabet Z\mathcal{Z}. Its Shannon entropy rate is

H(Z)limnH(Z1n)n,H(Z)\triangleq \lim_{n\rightarrow\infty}\frac{H(Z_1^n)}{n},

and, when the limit exists, its α\alpha-th order Rényi entropy rate is

Hα(Z)limnHα(Z1n)n.H_{\alpha}(Z)\triangleq \lim_{n\rightarrow\infty}\frac{H_{\alpha}(Z_1^n)}{n}.

Continuity conjecture. For every stationary ergodic process ZZ,

limα1Hα(Z)=H(Z).\lim_{\alpha\rightarrow 1}H_{\alpha}(Z)=H(Z).

The conjecture is a natural rate-level analogue of the finite-block identity limα1Hα(Z1n)=H(Z1n)\lim_{\alpha\rightarrow 1}H_{\alpha}(Z_1^n)=H(Z_1^n), but the existence of the Rényi entropy rate itself is not known for general stationary ergodic processes. The source reports this conjecture as neither proved nor disproved in the literature.

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Sources & referencesView supporting material

Primary source

Chengyu Wu, Yonglong Li, Li Xu and Guangyue Han, “Renyi Entropy Rate of Stationary Ergodic Processes”, arXiv:2207.07554 (2022).

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