Mathematics – Operator Algebras
Scientific paper
2011-01-15
Mathematics
Operator Algebras
Scientific paper
For $q>0$ let $\cA$ denote the unital $\ast$-algebra with generator $x$ and
defining relation $xx^\ast=qxx^\ast$. Based on this algebra we study $q$-normal
operators, the complex $q$-moment problem, positive elements and sums of
squares.
Cimpric Jaka
Savchuk Yurii
Schmüdgen Konrad
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