Extension of the law of iterated logarithm from basis vectors to all vectors

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Let TT be the random weighted shift associated with independent weights {Xn}n=1∞\{X_n\}_{n=1}^{\infty} on a Hilbert space H\mathcal{H}, and let {ek}k=1∞\{e_k\}_{k=1}^{\infty} be its associated orthonormal basis. Assume E(ln⁡X1)=0\mathbb{E}(\ln X_1)=0 and E((ln⁡X12)2)=σ2<∞\mathbb{E}((\ln X_1^2)^2)=\sigma^2<\infty. Lemma gives, for each basis vector eke_k, the almost-sure law-of-iterated-logarithm limits for ln⁡∥Tnek∥2\ln\|T^ne_k\|^2. Extension conjecture. Lemma holds for every x∈Hx\in\mathcal{H}, instead of only for ek∈He_k\in\mathcal{H}. This would extend the precise almost-sure growth-rate statement from individual basis vectors to arbitrary Hilbert-space vectors.

References

Primary source

Guozheng Cheng, Xiang Fang and Sen Zhu, “Random weighted shifts”, arXiv:1811.05761 (2018).

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