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Observations on some classes of operators on C(K,X)

  • I. Ghenciu,
  • R. Popescu

摘要

Suppose X and Y are Banach spaces, K is a compact Hausdorff space, \(\Sigma\) Σ is the \(\sigma\) σ -algebra of Borel subsets of K, \(C(K,X)\) C ( K , X ) is the Banach space of all continuous X-valued functions (with the supremum norm), and \(T \colon C(K,X)\to Y\) T : C ( K , X ) Y is a strongly bounded operator with representing measure \(m \colon \Sigma \to L(X,Y)\) m : Σ L ( X , Y ) . We show that if \(\hat{T} \colon B(K, X) \to Y\) T ^ : B ( K , X ) Y is its extension, then T is weak Dunford--Pettis (resp.weak* Dunford--Pettis, weak p-convergent, weak* p-convergent) if and only if \(\hat{T}\) T ^ has the same property.

We prove that if \(T \colon C(K,X)\to Y\) T : C ( K , X ) Y is strongly bounded limited completely continuous (resp. limited p-convergent), then \(m(A) \colon X\to Y\) m ( A ) : X Y is limited completely continuous (resp. limited p-convergent) for each \(A\in \Sigma\) A Σ . We also prove that the above implications become equivalences when K is a dispersed compact Hausdorff space.