Positivstellensatz and flat functionals on path *-algebras

Details Positivstellensatz and flat functionals on path *-algebras Positivstellensatz and flat functionals on path *-algebras

2009-04-06

arxiv.org/abs/0904.0971v2

Mathematics

Functional Analysis

corrected typos

Scientific paper

We consider the class of non-commutative *-algebras which are path algebras of doubles of quivers with the natural involutions. We study the problem of extending positive truncated functionals on such *-algebras. An analog of the solution of the truncated Hamburger moment problem by Curto and Fialkow for path *-algebras is presented and non-commutative positivstellensatz is proved. We aslo present an analog of the flat extension theorem of Curto and Fialkow for this class of algebras.

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