Geodesic
Best Coapproximation in Metric Spaces
Publications de l'Institut Mathématique, _N_S_51 (1992) no. 65, p. 71 .

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As a counterpart to best approximation, the concept of best coapproximation in normed linear spaces was introduced by C. Franchetti and M. Furi [2] 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. [3], [5], [7]). In this paper we discuss best coapproximation in metric spaces there by generalizing some of the results proved in [3], [7] and [8].
Classification : 41A65 41A50 
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     author = {T. D. Narang},
     title = {Best {Coapproximation} in {Metric} {Spaces}},
     journal = {Publications de l'Institut Math\'ematique},
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     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1992_N_S_51_65_a7/}
}
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T. D. Narang. Best Coapproximation in Metric Spaces. Publications de l'Institut Mathématique, _N_S_51 (1992) no. 65, p. 71 . http://geodesic.mathdoc.fr/item/PIM_1992_N_S_51_65_a7/