Weak type inequalities for ergodic strong maximal operators

Fava's weak type L log L estimate for strong two-parameter ergodic maximal operators associated to pairs of commuting non-periodic measure-preserving transformations is shown to be sharp. Moreover, given a function 4> on [0, oo) that is positive, increasing, and o(log(x)) for x —> oo as w...

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Elmentve itt :
Bibliográfiai részletek
Szerzők: Hagelstein Paul
Stokolos Alexander
Dokumentumtípus: Cikk
Megjelent: Bolyai Institute, University of Szeged Szeged 2010
Sorozat:Acta scientiarum mathematicarum 76 No. 3-4
Kulcsszavak:Matematika
Tárgyszavak:
Online Access:http://acta.bibl.u-szeged.hu/16358
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520 3 |a Fava's weak type L log L estimate for strong two-parameter ergodic maximal operators associated to pairs of commuting non-periodic measure-preserving transformations is shown to be sharp. Moreover, given a function 4> on [0, oo) that is positive, increasing, and o(log(x)) for x —> oo as well as a pair of commuting invertible non-periodic measure-preserving transformations on a space fi of finite measure, a function / £ L<f>(L)(Q,) is constructed whose associated multiparameter ergodic averages fail to converge almost everywhere in the unrestricted sense. 
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