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Limiting curlicue measures for theta sums

Francesco Cellarosi — 2011

Annales de l'I.H.P. Probabilités et statistiques

We consider the ensemble of curves { , : ∈(0, 1], ∈ℕ} obtained by linearly interpolating the values of the normalized theta sum −1/2∑=0−1exp(πi2), 0≤<. We prove the existence of limiting finite-dimensional distributions for such curves as →∞, when is distributed according to any probability measure , absolutely continuous w.r.t. the Lebesgue measure on [0, 1]. Our Main Theorem generalizes a result by Marklof [ (1999) 127–153] and Jurkat and van Horne [ ...

Ergodic properties of square-free numbers

Francesco CellarosiJakov G. Sinaj — 2013

Journal of the European Mathematical Society

We construct a natural invariant measure concentrated on the set of square-free numbers, and invariant under the shift. We prove that the corresponding dynamical system is isomorphic to a translation on a compact, Abelian group. This implies that this system is not weakly mixing and has zero measure-theoretical entropy.

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