Arens extensions of disjointness preserving multilinear operators

Abstract

First we give a counterexample showing that, unlike the second adjoint of a disjointness preserving linear operator, Arens extensions of disjointness preserving multilinear operators are not disjointness preserving in general. Then we prove that, if $E_1,\dots ,E_m$ are Riesz spaces with $F$ Archimedean and $A:E_1\times \cdots \times E_m\to F$ is a regular disjointness preserving $m$-linear operator, then all Arens extensions of $A$ are disjointness preserving if: (i) $A$ has finite lattice rank; or (ii) $E_1,\dots ,E_m$ are also Archimedean and the extensions are restricted to the product of the order continuous biduals; or (iii) the spaces are Banach lattices and either $E_1^{\ast },\dots ,E_m^{\ast }$ have order continuous norms or $F^{\ast }$ has a Schauder basis consisting of disjointness preserving functionals.

20 pages