P. Koszmider

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20242026

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math.OA2026

On masas of the Calkin algebra generated by projections

Piotr Koszmider

Assuming the continuum hypothesis CH, we obtain complete $*$ -isomorphic classification of maximal abelian self-adjoint subalgebras (masas) of the Calkin algebra $\mathcal Q(\ell_2)…

math.OA2024

Products of C*-algebras that do not embed into the Calkin algebra

Damian GÅodkowski, Piotr Koszmider

We consider the Calkin algebra $Q (ℓ_{2})$ , i.e., the quotient of the algebra $B (ℓ_{2})$ of all bounded linear operators on the separable Hilbert space $ℓ_{2}$ …