2019/03/06 by Saurabh Verma, Verma, S., P. Viswanathan +1
Mathematics · #28A80 #41A20 #41A30 #41A50 #Dynamical Systems (math.DS) #FOS: Mathematics #Mathematical Dynamics and Fractals
paper · pdf · doi:10.48550/arxiv.1903.02341
openalex publication_date 2019/03/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In [14,26], new approximation classes of self-referential functions are introduced as fractal versions of the classes of polynomials and rational functions. As a sequel, in the present article, we define a new approximation class consisting of self-referential functions, referred to as the fractal rational trigonometric functions. We establish Weierstrass type approximation theorems for this class and prove the existence of a best fractal rational trigonometric approximant to a real-valued continuous function on a compact interval. Furthermore, we provide an upper bound for the smallest error in approximating a prescribed continuous function by a fractal rational trigonometric function. This extemporizes an analogous result in the context of fractal rational function appeared in [26] and followed in the setting of Bernstein fractal rational functions in [23]. The last part of the article aims to clarify and correct the mathematical errors in some results on the Bernstein alpha-fractal functions appeared recently in the literature [22-24].