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Selections of the best and near-best approximation operators and solarity. (English, Russian) Zbl 1423.41041
Proc. Steklov Inst. Math. 303, 10-17 (2018); translation in Tr. Mat. Inst. Steklova 303, 17-25 (2018).
New significant results are given on the metric projections in the selections of the near-best approximation sets, named suns, in the finite-dimensional Banach spaces.

MSC:
 41A50 Best approximation, Chebyshev systems 41A28 Simultaneous approximation 41A35 Approximation by operators (in particular, by integral operators)
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References:
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