Abstract. The aim of the paper is to generalize two fundamental theorems of K.~Tandori. The coefficient sequences in his theorems are classical monotone decreasing. We moderate the classical monotonicity to locally almost monotonicity assumption.
DOI: 10.14232/actasm-013-777-5
AMS Subject Classification
(1991): 42A20, 42A16
Keyword(s):
orthogonal series,
coefficient conditions,
locally almost monotonicity
Received April 25, 2013, and in revised form June 3, 2013. (Registered under 27/2013.)
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