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 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.
Israel Journal of Mathematics
author list (cited authors)
Girardi, M., & Johnson, W. B.
complete list of authors
Girardi, Maria||Johnson, William B