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Decomposition theorems for unital graph C*-algebras

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arxiv 2505.12769 v3 pith:57RQO4Y3 submitted 2025-05-19 math.OA

Decomposition theorems for unital graph C*-algebras

classification math.OA
keywords graphunitalalgebrasdecompositionwhenadmitalgebraamalgamated
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We prove that unital graph C*-algebras often admit a convenient decomposition into amalgamated free products. We use this to give a complete characterization of when a unital graph C*-algebra is residually finite-dimensional and when it is operator norm stable (that is, matricially semiprojective).

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Cited by 2 Pith papers

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  1. The RFD property for graph $C^*$-algebras

    math.OA 2026-04 unverdicted novelty 7.0

    A graph C*-algebra is residually finite dimensional if and only if the graph has no infinite receiver, no cycle with an exit, no infinite backward chain, and every vertex reaches a sink, cycle, or infinite emitter.

  2. Residual finite-dimensionality of ultragraph algebras via branching systems

    math.OA 2026-07 unverdicted novelty 6.0

    Graph-theoretic RFD conditions on ultragraphs imply RFD for their Leavitt path algebras and C*-algebras, with equivalences under RFUM2 via branching systems and groupoid models.