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Properties of Wiener-Wintner dynamical systems

I. AssaniK. Nicolaou — 2001

Bulletin de la Société Mathématique de France

In this paper we prove the following results. First, we show the existence of Wiener-Wintner dynamical system with continuous singular spectrum in the orthocomplement of their respective Kronecker factors. The second result states that if f L p , p large enough, is a Wiener-Wintner function then, for all γ ( 1 + 1 2 p - β 2 , 1 ] , there exists a set X f of full measure for which the series n = 1 f ( T n x ) e 2 π i n ϵ n γ converges uniformly with respect to ϵ .

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