A functorial approach to the C*-algebras of a graph

Details A functorial approach to the C*-algebras of a graph A functorial approach to the C*-algebras of a graph

2001-02-27

arxiv.org/abs/math/0102213v2

International Journal of Math. v. 13 no. 3 (2002), 245-277.

Mathematics

Operator Algebras

24 pages. See also http://math.la.asu.edu/~jss New version comments: Corrected typos, and added references

Scientific paper

A functor from the category of directed trees with inclusions to the category of commutative C*-algebras with injective *-homomorphisms is constructed. This is used to define a functor from the category of directed graphs with inclusions to the category of C*-algebras with injective *-homomorphisms. The resulting C*-algebras are identified as Toeplitz graph algebras. Graph algebras are proved to have inductive limit decompositions over any family of subgraphs with union equal to the whole graph. The construction is used to prove various structural properties of graph algebras.

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