Best Co-approximation and Worst Approximation by Closed Unit Balls

‎A kind of approximation‎, ‎called best coapproximation was‎ introduced and discussed in normed linear spaces by C‎. ‎Franchetti and M‎. Furi in ۱۹۷۲‎. ‎Subsequently‎, ‎this study was taken up by several researchers‎ in different abstract spaces‎. In this paper‎, ‎we consider best coapproximation by closed unit balls‎. ‎We define qcoproximinal and coremotal‎, ‎and find some theorems.

Keywords:

‎Copoximinal‎ , ‎Cochebyshevl‎ , ‎ ‎Uniquely remotal‎ , ‎Qcoproximinal‎ , ‎Closed Unit Balls

Authors

Hamid Tehrani

Department of Mathematics, Yazd University, Yazd, Iran

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https://civilica.com/doc/1634348

شناسه ملی سند علمی:

JR_MSJI-16-2_007

تاریخ نمایه سازی: 28 فروردین 1402

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Tehrani, Hamid,1401,Best Co-approximation and Worst Approximation by Closed Unit Balls,https://civilica.com/doc/1634348

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