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math.OA2015
Quantum Graph Homomorphisms via Operator Systems
Carlos M. Ortiz, Vern I. Paulsen
We explore the concept of a graph homomorphism through the lens of C-algebras and operator systems. We start by studying the various notions of a quantum graph homomorphism and…
math.OA2014
Lovász theta type norms and Operator Systems
Carlos M. Ortiz, Vern I. Paulsen
To each graph on vertices there is an associated subspace of the matrices called the operator system of the graph. We prove that two graphs are isomorphic if and o…