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Oblique projections and frames |
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| Authors: | J Antezana G Corach M Ruiz D Stojanoff |
| Institution: | IAM-CONICET and Departamento de Matemática, FCE-UNLP, La Plata, Argentina ; IAM-CONICET and Departamento de Matemática, FI-UBA, Saavedra 15, Piso 3 (1083), Ciudad Autónoma de Buenos Aires, Argentina ; IAM-CONICET and Departamento de Matemática, FCE-UNLP, La Plata, Argentina ; IAM-CONICET and Departamento de Matemática, FCE-UNLP, La Plata, Argentina |
| Abstract: | We characterize those frames on a Hilbert space  which can be represented as the image of an orthonormal basis by an oblique projection defined on an extension  of  . We show that all frames with infinite excess and frame bounds  are of this type. This gives a generalization of a result of Han and Larson which only holds for normalized tight frames. |
| Keywords: | Frames oblique projections |
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