Abstract
1. A set of functions {øν (t)} (ν = 1, 2, …) is said to be closed L2 in (a, b), ifimplies f (t) = 0 p.p. in (a, b). It is well known that a set of functions is closed L2, if and only if every function of L2 (a, b) can be approximated in the mean square sense as closely as desired by finite linear combinations of the øν (t).
Publisher
Cambridge University Press (CUP)
Cited by
14 articles.
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