Weighted Moduli of Smoothness and Sign-Preserving Approximation

• Дата: 2005
• Автори: Smazhenko, I. V., Смаженко, І. В.
• Формат: Стаття
• Мова: Українська; Англійська
• Опубліковано: Institute of Mathematics, NAS of Ukraine 2005
• Онлайн доступ: https://umj.imath.kiev.ua/index.php/umj/article/view/3608
• Назва журналу: Ukrains’kyi Matematychnyi Zhurnal

We consider a continuous function that changes its sign on an interval finitely many times and pose the problem of the approximation of this function by a polynomial that inherits its sign. For this approximation, we obtain (in the case where this is possible) Jackson-type estimates containing modif...