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math.OA2026
A new characterization of (pre)liminary C*-algebras
Martino Lupini
Given an arbitrary countable ordinal , we introduce the notion of type C*-algebra and -subhomogeneous C*-algebra. When , these recover the notions of Fell C*…
math.OA2025
Derivation length and automorphism length of unital C*-algebras
Martino Lupini
This paper is a contribution to the study of the ordinal-valued invariants of derivation and automorphism length. Akemann--Pedersen and Elliott proved that a separable unital C*-al…