Remarks on the Istratescu measure of noncompactness

• Autores: Janusz Dronka
• Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 44, Fasc. 1-3, 1993, págs. 91-104
• Idioma: inglés
• Enlaces
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• Resumen

  • In this paper we give estimations of Istratescu measure of noncompactness $I(X)$ of a set $X\subset l^p(E_1,\dots , E_n)$ in terms of measures $I(X_j) (j = 1,\dots , n)$ of projections $X_j$ of $X$ on $E_j$ . Also a converse problem of finding a set $X$ for which the measure $I(X)$ satisfies the estimations under consideration is considered.

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