Best coapproximation in quotient spaces |
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Authors: | H. Mazaheri |
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Affiliation: | Faculty of Mathematics, Yazd University, Yazd, Iran |
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Abstract: | As a counterpart to best approximation in normed linear spaces, best coapproximation was introduced by Franchetti and Furi. In this paper, we apply the above coapproximation, and obtain some results on the upper semi-continuity of cometric projection maps. Also we shall determine under what conditions coproximinality can be transmitted to and from quotient spaces. |
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Keywords: | 41A50 41A52 41A17 54B15 35E10 |
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