33 research outputs found
Tensor products of subspace lattices and rank one density
We show that, if is a subspace lattice with the property that the rank
one subspace of its operator algebra is weak* dense, is a commutative
subspace lattice and is the lattice of all projections on a separable
infinite dimensional Hilbert space, then the lattice is
reflexive. If is moreover an atomic Boolean subspace lattice while is
any subspace lattice, we provide a concrete lattice theoretic description of
in terms of projection valued functions defined on the set of
atoms of . As a consequence, we show that the Lattice Tensor Product Formula
holds for \Alg M and any other reflexive operator algebra and give several
further corollaries of these results.Comment: 15 page
Classification of limits of upper triangular matrix algebras.
Let Tn be the operator algebra of upper triangular n × n complex matrices. Three families of limit algebras of the form lim (Tnk) are classified up to isometric algebra isomorphism: (i) the limit algebras arising when the embeddings Tnk→Tnk+1, are alternately of standard and refinement type; (ii) limit algebras associated with refinement embeddings with a single column twist; (iii) limit algebras determined by certain homogeneous embeddings. The last family is related to certain fractal like subsets of the unit square
Subalgebras of groupoid C*-algebras.
We prove a spectral theorem for bimodules in the context of graph C*-algebras. A bimodule over a suitable abelian algebra is determined by its spectrum (i.e., its groupoid partial order) iff it is generated by the Cuntz-Krieger partial isometries which it contains iff it is invariant under the gauge automorphisms. We study 1-cocycles on the Cuntz-Krieger groupoid associated with a graph C*-algebra, obtaining results on when integer valued or bounded cocycles on the natural AF subgroupoid extend. To a finite graph with a total order, we associate a nest subalgebra of the graph C*-algebra and then determine its spectrum. This is used to investigate properties of the nest subalgebra. We give a characterization of the partial isometries in a graph C*-algebra which normalize a natural diagonal subalgebra and use this to show that gauge invariant generating triangular subalgebras are classified by their spectra
Grothendieck group invariants for partly self-adjoint operator algebras.
Partially ordered Grothendieck group invariants are introduced for general operator algebras and used in the classification of direct systems and direct limits of finite-dimensional complex incidence algebras with common reduced digraph H (systems of H-algebras). In particular the dimension distribution group G (A; C), defined for an operator algebra A and a self-adjoint subalgebra C, generalizes both the K0 group of a σ-unital C*-algebra B and the spectrum (fundamental relation) R(A) of a regular limit A of triangular digraph algebras. This invariant is more economical and computable than the regular Grothendieck group which nevertheless forms the basis for a complete classification of regular systems of H-algebras