Abstract.
Several results on norms of projections on a Hilbert space \({\mathcal{H}}\) are extended for the operator seminorm defined by a positive semidefinite operator \(A\,\in\,L({\mathcal{H}})^+\).
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To our teacher Mischa Cotlar, in memoriam
The authors were supported in part by UBACYT I030, ANPCYT PICT 03-09521, PIP 2188/00.
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Arias, M.L., Corach, G. & Gonzalez, M.C. Metric Properties of Projections in Semi-Hilbertian Spaces. Integr. equ. oper. theory 62, 11–28 (2008). https://doi.org/10.1007/s00020-008-1613-6
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DOI: https://doi.org/10.1007/s00020-008-1613-6