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On ell-open C^* algebras and ell-closed C^*-algebras

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arxiv 2310.15155 v2 pith:54ZIZSVD submitted 2023-10-23 math.OA

On ell-open C^* algebras and ell-closed C^*-algebras

classification math.OA
keywords algebrasopenclosedalgebrablackadarcharacterizecommutativeconjectured
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In this paper, we characterize $\ell$-open and $\ell$-closed $C^*$-algebras and deduce that $\ell$-open $C^*$-algebras are $\ell$-closed, as conjectured by Blackadar. Moreover, we show that a commutative unital $C^*$-algebra is $\ell$-open if and only if it is semiprojective.

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  1. Semiprojective Banach lattices

    math.FA 2026-04 unverdicted novelty 6.0

    C(X) is semiprojective as a Banach lattice iff the compact metric space X is an absolute neighbourhood retract.