Abstract.
In the recent preprint [1] S. Parrott proves 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.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Levy, R. Note on the Curvature and Index of an Almost Unitary Contraction Operator. Integr. equ. oper. theory 48, 553–555 (2004). https://doi.org/10.1007/s00020-003-1276-2
Received:
Issue Date:
DOI: https://doi.org/10.1007/s00020-003-1276-2