کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4607086 | 1631425 | 2014 | 20 صفحه PDF | دانلود رایگان |
• The class of fractal rational functions is introduced.
• Approximation properties of this new class is investigated.
• Existence of fractal rational functions copositive with a continuous function is shown.
This article introduces fractal perturbation of rational functions via αα-fractal operator and investigates some approximation theoretic aspects of this new function class, namely, the class of fractal rational functions. Its specific aims are: (i) to define fractal rational functions (ii) to investigate the optimal perturbation to a traditional rational approximant corresponding to a continuous function (iii) to establish the fractal rational function analogues of the celebrated Weierstrass theorem and its generalization, namely, the Müntz theorem (iv) to prove the existence of a best fractal rational approximant to a continuous function defined on a real compact interval, and to study certain properties of the corresponding best approximation operator. By establishing the existence of fractal rational functions that are copositive with a prescribed continuous function, the current article also attempts to invoke fractal functions to the field of shape preserving approximation.
Journal: Journal of Approximation Theory - Volume 185, September 2014, Pages 31–50