PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.)
Vol. 51(65), pp. 71--76 (1992)
Best coapproximation in metric spaces
T.D. NarangDepartment of Mathematics, Guru Nanak Dev University, Amritsar 143005, India.
Abstract: As a counterpart to best approximation, the concept of best coapproximation in normed linear spaces was introduced by C. Franchetti and M. Furi  in 1972. This study was subsequently pursued in normed linear spaces and Hilbert spaces by H. Behrens, L. Hetzelt, P.\,L. Papini, Geetha S. Rao, Ivan Singer, U. Westphal, the author and a few others (see e.g. , , ). In this paper we discuss best coapproximation in metric spaces there by generalizing some of the results proved in ,  and .
Classification (MSC2000): 41A65; 41A50
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