Abstract. It is proved a necessary and sufficient type theorem concerning the absolute summability of the generalized de la Vallée Poussin means of orthogonal series.
AMS Subject Classification
(1991): 42C15, 40G99
Keyword(s):
de la Vallée Poussion summability
Received March 13, 2012, and in revised form September 3, 2013. (Registered under 15/2012.)
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