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On ell-open C^* algebras and ell-closed C^*-algebras
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On ell-open C^* algebras and ell-closed C^*-algebras
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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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Semiprojective Banach lattices
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