Exponentially Accurate Approximations to Piece-Wise Smooth Periodic Functions

Authors:
James Geer;Nana Saheb Banerjee
Affiliations:
Department of Systems Science and Industrial Engineering, Watson School of Engineering and Applied Science, Binghamton University, Binghamton, New York 13902;Department of Systems Science and Industrial Engineering, Watson School of Engineering and Applied Science, Binghamton University, Binghamton, New York 13902
Venue:
Journal of Scientific Computing
Year:
1997

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Abstract

A family of simple, periodic basis functions with “built-in” discontinuities are introduced, and their properties are analyzed and discussed. Some of their potential usefulness is illustrated in conjunction with the Fourier series representation of functions with discontinuities. In particular, it is demonstrated how they can be used to construct a sequence of approximations which converges exponentially in the maximum norm to a piece-wise smooth function. The theory is illustrated with several examples and the results are discussed in the context of other sequences of functions which can be used to approximate discontinuous functions.