On the Ritt property and weak type maximal inequalities for convolution powers on $\ell^1(\Z)$

In this paper we study the behaviour of convolution powers of probability measures $μ$ on $\Z$, such that $(μ(n))_{n\in \N}$ is completely monotone or such that $ν$ is centered with a second moment. In particular we exhibit many new examples of probability measures on $\Z$ having the so called Ritt property and whose convolution powers satisfy weak type maximal inequalities in $\ell^1(\Z)$.

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