67 citations · 76 across the 6 of their papers we have counts for
5 papers · 1 filter
Dual Entropy in Discrete Groups with Amenable Actions
N. P. Brown, E. Germain
We introduce a notion of entropy for automorphisms of discrete groups which admit amenable actions on a compact space. This entropy is dual to classical topological entropy in the…
Herrero's Approximation Problem for Quasidiagonal Operators
Nathanial P. Brown
Let T be a quasidiagonal operator on a separable Hilbert space. Then T is the norm limit of operators, each of which generate a finite dimensional C*-algebra, if and only if the C*…
Characterizing Type I C*-algebras via Entropy
Nathanial P. Brown
Let A be a unital separable C*-algebra. We observe that A is type I if and only if the CNT-entropy of every inner automorphism of A is zero.
Extensions of Quasidiagonal C*-algebras and K-theory
N. P. Brown, M. Dadarlat
We study the extension problem for quasidiagonal (QD) C*-algebras (i.e. when is an extension of QD C*-algebras again QD?). The main positive result states that in many instances an…
On Quasidiagonal C*-algebras
Nathanial P. Brown
We give a detailed survey of the theory of quasidiagonal C*-algebras. The main structural results are presented and various functorial questions around quasidiagonality are discuss…