Universal non-completely-continuous operators Academic Article uri icon

abstract

  • 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.

citation count

  • 9

complete list of authors

  • Girardi, Maria||Johnson, William B

publication date

  • December 1997