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BEST APPROXIMATION THEOREM FOR SET-VALUED MAPPINGS WITHOUT CONVEX VELUES AND CONTINUITY
丁协平;何诣然
BEST APPROXIMATION THEOREM FOR SET-VALUED MAPPINGS WITHOUT CONVEX VELUES AND CONTINUITY
Ding Xieping;He Yiran
Applied Mathematics and Mechanics (English Edition) . 1998, (
9
): 831 -836 .
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