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Mathematics - Analysis | Overconvergence in Complex Approximation

Overconvergence in Complex Approximation

Gal, Sorin G.

2013, XIV, 194 p.

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  • ​ Presents quantitative overconvergence results in complex approximation
  • Generalizes and extends the results for certain cases of the complex q-Bernstein operators
  • Includes a notes and open problems section at the end of each chapter, promoting future research

This monograph deals with the quantitative overconvergence phenomenon in complex approximation by various operators. The book is divided into three chapters. First, the results for the Schurer-Faber operator, Beta operators of first kind, Bernstein-Durrmeyer-type operators and Lorentz operator are presented. The main focus is on results for several q-Bernstein kind of operators with q > 1, when the geometric order of approximation 1/q^n is obtained not only in complex compact disks but also in quaternion compact disks and in other compact subsets of the complex plane. The focus then shifts to quantitative overconvergence and convolution overconvergence results for the complex potentials generated by the Beta and Gamma Euler's functions. Finally quantitative overconvergence results for the most classical orthogonal expansions  (of  Chebyshev, Legendre, Hermite,  Laguerre and Gegenbauer kinds) attached to vector-valued functions are presented. Each chapter concludes with a notes and open problems section, thus providing stimulation for further research. An extensive bibliography and index complete the text. 

 

This book is suitable for researchers and graduate students working in complex approximation and its applications, mathematical analysis and numerical analysis.

Content Level » Research

Keywords » approximation by complex Bernstein-type operators - approximation by complex potential of Euler-type - overconvergence of complex orthogonal polynomials - overconvergence phenomenon - quantitative overconvergence

Related subjects » Analysis

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