Note on the Curvature and Index of Almost Unitary Contraction Operator

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59640In the recent preprint (OA/0006224) S. Parrott proved the equality between the Arveson`s curvature and the Fredholm index of a "pure" contraction with finite defect numbers. In the present note one derives a similar formula in the "non-pure" case.3 pagesFunctional AnalysisOperator Algebras47A53; 47A20Note on the Curvature and Index of Almost Unitary Contraction Operatortext