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Information × Registration Number 0121U108965, ( 0226U001803  ) R & D request Title The efficiency of the application of systems of orthonormal functions in solving problems of mathematical physics Head Hanulich Borys K., Registration Date 28-02-2021 Organization Lutsk National Technical University popup.description1 Under the efficiency of the application we will understand the maximum absolute deviation and variance of a certain function when approaching it with a limited number of terms-terms of the series: the smaller the deviation and variance, the more efficient the representation. In addition, it is known that the trigonometric Fourier series of a piecewise continuous function at the points of continuity coincides with the value of the function, at the point of rupture of the first kind the series coincides with the arithmetic mean left and right boundaries. popup.nrat_date 2024-12-09 Close