Necessary and sufficient condition for compactness of the embedding operator

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94656An improvement of the author's result, proved in 1961, concerning necessary and sufficient conditions for the compactness of an imbedding operator is given.Functional Analysis46B50, 46E30, 47B07Necessary and sufficient condition for compactness of the embedding operatortext