Operator system

Given a unital C*-algebra ${\mathcal {A}}$ , a *-closed subspace S containing 1 is called an operator system. One can associate to each subspace $\mathcal{M} \subseteq \mathcal{A}$ of a unital C*-algebra an operator system via $S:= \mathcal{M}+\mathcal{M}^* +\mathbb{C} 1$ .

The appropriate morphisms between operator systems are completely positive maps.

By a theorem of Choi and Effros, operator systems can be characterized as *-vector spaces equipped with an Archimedean matrix order.^[1]

References

↑ Choi M.D., Effros, E.G. Injectivity and operator spaces. Journal of Functional Analysis 1977

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Operator system

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References