Reconstructing directed graphs from generalized gauge actions on their Toeplitz algebras

  title={Reconstructing directed graphs from generalized gauge actions on their Toeplitz algebras},
  author={Nathan Brownlowe and Marcelo Laca and David Robertson and Aidan Sims},
  journal={Proceedings of the Royal Society of Edinburgh: Section A Mathematics},
  pages={2632 - 2641}
Abstract We show how to reconstruct a finite directed graph E from its Toeplitz algebra, its gauge action, and the canonical finite-dimensional abelian subalgebra generated by the vertex projections. We also show that if E has no sinks, then we can recover E from its Toeplitz algebra and the generalized gauge action that has, for each vertex, an independent copy of the circle acting on the generators corresponding to edges emanating from that vertex. We show by example that it is not possible… 

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