The Diagonal Functors |
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Authors: | Yolanda Moreno |
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Affiliation: | (1) Departamento de Matemáticas, Escuela Politécnica de Cáceres, Universidad de Extremadura, Avda. Universidad s/n, 10071 Cáceres, Spain |
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Abstract: | We obtain new categorical proofs that generalize the diagonal principles introduced in Castillo and Moreno (Israel J. Math. 140:253–270, 2004) to study the automorphic and partially automorphic character of Banach spaces. We then introduce and study the automorphy index for a Banach space, showing that while . This research has been supported in part by project MTM2004-02635. |
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Keywords: | Diagonal principles Short exact sequence Automorphic spaces Automorphy index Banach space |
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