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A Schur-class function in $$d$$ d variables is defined to be an analytic contractive-operator valued function on the unit polydisk. Such a function is said to be in the Schur–Agler class if it is contractive when evaluated on any commutative $$d$$ d -tuple of strict contractions on a Hilbert space. It is known that the Schur–Agler class is a strictly proper subclass of the Schur class...
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