
A complete orthonormal system of functions {Θ n } n=1 ∞ ,Θ n ∈L [0,1] ∞ defined on the closed interval [0,1] is constructed such that ∑n=1∞anΘn diverges almost everywhere for any {an}n=1∞∉l2. For the constructed system the following result is true: Any nontrivial series by the system {Θn}n=1∞ which converges in measure to zero diverges almost everywhere.
independent functions, Independent functions, complete orthonormal system, Complete orthonormal system, Representation of functions by series, representation of functions by series, divergence, Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis, Completeness of sets of functions in nontrigonometric harmonic analysis, divergence almost everywhere, Analysis, Divergence almost everywhere
independent functions, Independent functions, complete orthonormal system, Complete orthonormal system, Representation of functions by series, representation of functions by series, divergence, Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis, Completeness of sets of functions in nontrigonometric harmonic analysis, divergence almost everywhere, Analysis, Divergence almost everywhere
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