A REVISIT TO STABILITY OF SCHAUDER BASES: FRACTALIZING MULTIVARIATE FABER–SCHAUDER SYSTEM

M. A. Navascuã‰s () and P. Viswanathan
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M. A. Navascuã‰s: Departamento de Matemática Aplicada, Escuela de Ingeniería y Arquitectura, Universidad de Zaragoza, Zaragoza, Spain
P. Viswanathan: Department of Mathematics, Indian Institute of Technology Delhi, New Delhi, India

FRACTALS (fractals), 2022, vol. 30, issue 03, 1-12

Abstract: Let X be a Banach space with a Schauder basis (xm)m=0∞, and I be the identity operator on X. It is known, at least in essence, that if (Tm)m=0∞ is a sequence of bounded linear operators on X such that ∑m=0∞∥I − T m∥ < ∞, then (Tm(xm))m=0∞ is also a basis. The first part of this work acts as an expository note to formally record the aforementioned stability result. In the second part, we apply this stability result to construct a Schauder basis consisting of bivariate fractal functions for the space of continuous functions defined on a rectangle. To this end, fractal perturbations of the elements in the classical bivariate Faber–Schauder system are formulated using a sequence of bounded linear fractal operators close to the identity operator in accordance with the stability result mentioned above. This illustration, although emphasized only for the bivariate case, can easily be extended to higher dimensions. Further, the perturbation technique used here acts as a companion for a few researches on fractal bases in the univariate setting.

Keywords: Schauder Basis; Stability; Space of Continuous Functions; Faber–Schauder System; Fractal Interpolation; Fractal Operator (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218348X2272001X

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