Browsing Mathemateg a Ffiseg / Mathematics & Physics by Author "Evans, D. Gwion"

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Non-abelian Weyl Commutation Relations and the Series Product of Quantum Stochastic Evolutions

Evans, D. Gwion; Gough, John; James, Matthew (2012-11-07)

We show that the series product, which serves as an algebraic rule for connecting state-based input/output systems, is intimately related to the Heisenberg group and the canonical commutation relations. The series product ...
When is the Cuntz-Krieger algebra of a higher-rank graph approximately finite-dimensional?

Sims, Aidan; Evans, D. Gwion (2012-01-18)

We investigate the question: when is a higher-rank graph C*-algebra approximately finite dimensional? We prove that the absence of an appropriate higher-rank analogue of a cycle is necessary. We show that it is not in ...

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