Fejér means of functions on noncommutative Vilenkin groups with respect to the character system

Author： Gát György  

Publisher： Springer Publishing Company

ISSN： 0133-3852

Source： Analysis Mathematica, Vol.32, Iss.1, 2006-03, pp. : 25-48

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Abstract

It is known that the Fejér means - with respect to the character system of the Walsh, and bounded Vilenkin groups - of an integrable function converge to the function a.e. In this work we discuss analogous problems on the complete product of finite, not necessarily Abelian groups with respect to the character system for functions that are constant on the conjugacy classes. We find that the nonabelian case differs from the commutative case. We prove the a.e. convergence of the (C,1) means of the Fourier series of square integrable functions. We also prove the existence of a function f∈Lq for some q >1 such that sup |σn f | = + ∞ a.e. This is a sharp contrast between the Abelian and the nonabelian cases.

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