The Trace, the Conjugation and the Right Action of a Cyclic Tracial Operator Algebra
lemmaAnalysislem:cyclic-tracial-conjugation-2026aThe trace of a cyclic tracial operator algebra is a faithful tracial state, the cyclic vector separates the algebra and its commutant, the map sending S Omega to S* Omega extends to a conjugation, and conjugating the algebra by it gives right multiplications, which lie in the commutant.
In the setting of Complex Hilbert Spaces and Bounded Linear Maps: Standing Notation, let be a cyclic tracial operator algebra with trace , let be the commutant of , and let conjugations and conjugated maps be those of Conjugation of a Complex Hilbert Space.
1. (Trace)¶ is linear and , and for all
2. (Separation)¶ If and , then . If and , then . In particular holds for only if .
3. (Conjugation)¶ There is exactly one conjugation of with for every ; it is called the conjugation of , and .
4. (Right action)¶ For every , and for every .
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