Universal non-completely-continuous operators
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A bounded linear operator between Banach spaces is called completely continuous if it carries weakly convergent sequences into norm convergent sequences. Isolated is a universal operator for the class of non-completely-continuous operators from L1 into an arbitrary Banach space, namely, the operator from L1 into ℓ∞ defined by (equation presented) where rn is the nth Rademacher function. It is also shown that there does not exist a universal operator for the class of non-completely-continuous operators between two arbitrary Banach spaces. The proof uses the factorization theorem for weakly compact operators and a Tsirelson-like space.
author list (cited authors)
Girardi, M., & Johnson, W. B.
complete list of authors
Girardi, Maria||Johnson, William B