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Published online by Cambridge University Press: 20 November 2018
Orthonormal sequences, o.n. s., {ϕn} defined on [0,1] and satisfying
1
have been studied in [3] and [1]. One of the objects of this paper is to indicate that the methods used to study such o. n. s. can be used for a much wider class, and that, although there seems to be no super theorem to cover all cases, a knowledge of the results and methods of proof in some fairly broad special cases enables one to state and prove theorems for other classes of o. n. s.