Geodesic
Linear approximation of vector functions
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 20 (2014) no. 4, pp. 38-43

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In a problem on the approximation of a vector function continuous on an interval by linear functions in the Chebyshev metric, necessary and sufficient conditions on the best approximation function are established.
Keywords: vector function, approximation, criterion. 
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     author = {V. I. Berdyshev},
     title = {Linear approximation of vector functions},
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     url = {http://geodesic.mathdoc.fr/item/TIMM_2014_20_4_a3/}
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V. I. Berdyshev. Linear approximation of vector functions. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 20 (2014) no. 4, pp. 38-43. http://geodesic.mathdoc.fr/item/TIMM_2014_20_4_a3/