Characteristic Function of a Pure Commuting Contractive Tuple

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Operator Theory on Noncommutative Domains (2007, unknown): “, Tn) ∈ Dp(H) is a commuting n-tuple of operators, we obtain the characteristic function introduced in [84] and [24], and further studied in [85], [25] and [20].”
Operator theory on noncommutative varieties (2005, background): “In this particular setting, the characteristic function was proved to be a complete unitary invariant for pure row contractions in [ 6 ] and, independently, by the author in [22].”