عرض تفاصيل البحث

ادناه جميع التفاصيل الخاصة بالبحث المطلوب عرضه. توفر هذه المنصة معلومات اساسية حول البحث, لمزيد من التفاصيل يرجى متابعة التصفح من خلال الضغط على الرابط الاصلي للبحث او رابط DOI.

عنوان البحث
Coconvex multi approximation in the uniform norm
عنوان المجلة
Journal of Interdisciplinary Mathematics
ISSN-2169-012X
تفاصيل النشر
سنة النشر - 2022 / الفهرس الاصلي للمجلة - 25 : 5 (عدد الصفحات 8)
تصنيف البحث
رياضيات - المجموعة العلمية
البحث والاستدامة
غير مرتبط باهداف التنمية المستدامة  
البحث والمجتمع
غير محدد
الكلمات المفتاحية

اسم الباحثجهة الانتساببلد الباحث
ميادة علي كريم جامعة بابل العراق

In this research, we study the results about coconvex multi approximation. Recently this subject received a lot of attention. The first result in the topic is a direct theorem for the error bound of the convex approximation for functions of two continuous derivatives that were introduced by Kopotun. In 2006 Kopotun, Leviatan and Shevchuk gave definitive answers to open problems of Jackson’s estimates by the moduli of smoothness of Ditzian- Totiktype, also in 2019 they stated many open problems in the coconvex case and mentioned recent developments on this subject. In convex multi approximation, we have a function f C[-1, 1]d change its convexity at a finite number of times in [-1, 1]d and we take care of error bound of approximation of the function f using multi algebraic polynomials, in other words, multi algebraic polynomials change its convex particularly at the same points where f is. We can get some of Jackson’s estimates in which the intended constants depend on the place of the convexity change points. In order to clarify the complexities, we discuss in this research invers inequality for the coconvex approximation of the function f using multi algebraic polynomials.