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We introduce inner band projections in the space of regular operators on a Dedekind complete Banach lattice and study some structural properties of this class. In particular, we provide a new characterization of atomic order continuous Banach lattices as those for which all band projections in the corresponding space of regular operators are inner. We also characterize the multiplication operators L A R B LARB which are band projections precisely as those with A, B A, B being band projections up to a scalar multiple.
Muñoz-Lahoz et al. (Sat,) studied this question.