Extremely Non-symmetric, Non-multiplicative, Non-commutative Operator Spaces

Details Extremely Non-symmetric, Non-multiplicative, Non-commutative Operator Spaces Extremely Non-symmetric, Non-multiplicative, Non-commutative Operator Spaces

2008-05-22

arxiv.org/abs/0805.3513v1

Mathematics

Operator Algebras

Scientific paper

Motivated by importance of operator spaces contained in the set of all scalar multiples of isometries ($MI$-spaces) in a separable Hilbert space for $C^*$-algebras and E-semigroups we exhibit more properties of such spaces. For example, if an $MI$-space contains an isometry with shift part of finite multiplicity, then it is one-dimensional. We propose a simple model of a unilateral shift of arbitrary multiplicity and show that each separable subspace of a Hilbert space is the range of a shift. Also, we show that $MI$-spaces are non-symmetric, very unfriendly to multiplication, and prove a Commutator Identity which elucidates the extreme non-commutativity of these spaces.

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