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A quantitative interpretation of the frequent hypercyclicity criterion
Ist Teil von
Ergodic theory and dynamical systems, 2019-04, Vol.39 (4), p.898-924
Ort / Verlag
Cambridge, UK: Cambridge University Press
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We give a quantitative interpretation of the frequent hypercyclicity criterion. Actually we show that an operator which satisfies the frequent hypercyclicity criterion is necessarily
$A$
-frequently hypercyclic, where
$A$
refers to some weighted densities sharper than the natural lower density. In that order, we exhibit different scales of weighted densities that are of interest to quantify the ‘frequency’ measured by the frequent hypercyclicity criterion. Moreover, we construct an example of a unilateral weighted shift which is frequently hypercyclic but not
$A$
-frequently hypercyclic on a particular scale.