Inverses of disjointness preserving operators

Abramovich, Y. A.; Kitover, A. K.

doi:10.1090/memo/0679

Cited by 58 publications

(73 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such maps are usually called disjointness preserving operators or d-homomorphisms. The reader interested in this setting is referred to the monograph [1]. The concept of a disjointness preserving operator was exported to function algebras by E. Beckenstein and L. Narici (see [5] for general information).…”

mentioning

confidence: 99%

Maps preserving zero products

et al. 2009

View full text Add to dashboard Cite

Abstract. A linear map T from a Banach algebra A into another B preserves zero products if T (a)T (b) = 0 whenever a, b ∈ A are such that ab = 0. This paper is mainly concerned with the question of whether every continuous linear surjective map T : A → B that preserves zero products is a weighted homomorphism. We show that this is indeed the case for a large class of Banach algebras which includes group algebras.Our method involves continuous bilinear maps φ : A × A → X (for some Banach space X) with the property that φ(a, b) = 0 whenever a, b ∈ A are such that ab = 0. We prove that such a map necessarily satisfies φ(aµ, b) = φ(a, µb) for all a, b ∈ A and for all µ from the closure with respect to the strong operator topology of the subalgebra of M(A) (the multiplier algebra of A) generated by doubly power-bounded elements of M(A). This method is also shown to be useful for characterizing derivations through the zero products.Introduction. S. Banach [4] was the first to describe isometries on L p ([0, 1]) with p = 2. Although Banach did not give the full proof for this case (this was provided by J. Lamperti [26]), he made the key observation that isometries on L p ([0, 1]) must take functions with disjoint support into functions with disjoint support. This property arises in a variety of situations and has been considered by several authors. For example, in the theory of Banach lattices there is an extensive literature about linear maps T : X → Y , where X and Y are Banach lattices, with the property that |T (x)| ∧ |T (y)| = 0 whenever x, y ∈ X are such that |x| ∧ |y| = 0. Such maps are usually called disjointness preserving operators or d-homomorphisms. The reader interested in this setting is referred to the monograph [1]. The concept of a disjointness preserving operator was exported to function algebras by E. Beckenstein and L. Narici (see [5] for general information).

show abstract

mentioning

confidence: 99%

Maps preserving zero products

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Among others, on Banach lattices (see e.g. [1], [2] or [6]), on spaces of continuous functions (see e.g. [14], [3], [7], [15] or [12]), on group algebras of locally compact Abelian groups ( [8]), on Fourier algebras ( [10] and [20]) and on some others (see e.g.…”

mentioning

confidence: 99%

Disjointness preserving mappings on BSE Ditkin algebras

Font¹

2011

Publ. Math. Debrecen

View full text Add to dashboard Cite

Let A and B be regular Banach function algebras. A linear map T defined from A into B is said to be disjointness preserving or sepa-We prove that if there exists a disjointness preserving bijection between two BSE Ditkin algebras with a BAI, then they are isomorphic as algebras. As a corollary we can deduce that two of these algebras are algebraically isomorphic if there exists a surjective isometry between them for the supremum norm.

show abstract

“…We refer to a result as elementary if it admits a proof in Zermelo-Fraenkel set theory. For recent results and more bibliography on disjointness preserving operators, we refer to the remarkable memoir [1] by Abramovich and Kitover. At the end of this introduction the authors thank the anonymous referee for many comments that improved the paper significantly.…”

Section: Moreover |U | = Imentioning

confidence: 99%