Resumen de A version of Kalton’s theorem for the space of regular operators

Foivos Xanthos

• In this note we extend some recent results in the space of regular operators [appeared in Bu and Wong (Indag Math 23:199–213, 2012), Bu et al. (Collect Math 62:131–137, 2011), and Li et al. (Taiwan J Math 16:207–215, 2012)]. Our main result is the following Banach lattice version of a classical result of Kalton: Let ? be an atomic Banach lattice with an order continuous norm and ? a Banach lattice. Then the following are equivalent: (i) ??(?,?) contains no copy of ℓ∞ , (ii) ??(?,?) contains no copy of ?0 , (iii) ??(?,?) contains no copy of ?0 , (iv) ??(?,?) is a (projection) band in ??(?,?) , (v) ??(?,?)=??(?,?) .