Suitable norms for simultaneous approximation.

In [6], C. Dierick deals with a small but important collection of norms in the product of a finite number of normed linear spaces and he extends to such products some results on functional characterization of best approximations. In this paper we establish the widest scope in which the mentioned results remain valid.

Completeness and approximation

P. L. Papini (1987)

Matematički Vesnik

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On a theorem of V. Pták concerning best approximation of continuous functions in the metric $\int_{a}^{b} | x (t) | d t$

I. Singer (1960)

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Fernando Cobos (1988)

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