41 Approximations and expansions
41A52 Uniqueness of best approximation (3 articles)
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Reich, Simeon; Zaslavski, Alexander J.:
Best approximations and porous sets.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 44
(2003),
issue 4,
pp. 681-689
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Baronti, Marco; Fragnelli, Vito; Lewicki, Grzegorz:
Extensions of linear operators from hyperplanes of $l^{(n)}_\infty$.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 36
(1995),
issue 3,
pp. 443-458
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Lewicki, Grzegorz:
Strong unicity criterion in some space of operators.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 34
(1993),
issue 1,
pp. 81-87