Differentials of complex interpolation processes for Köthe function spaces
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Abstract:
We continue the study of centralizers on Köthe function spaces and the commutator estimates they generate (see [29]). Our main result is that if $X$ is a super-reflexive Köthe function space then for every real centralizer $\Omega$ on $X$ there is a complex interpolation scale of Köthe function spaces through $X$ inducing $\Omega$ as a derivative, up to equivalence and a scalar multiple. Thus, in a loose sense, all real centralizers can be identified with derivatives of complex interpolation processes. We apply our ideas in an appendix to show, for example, that there is a twisted sum of two Hilbert spaces which fails to be a $({\text {UMD}})$-space.References
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Additional Information
- © Copyright 1992 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 333 (1992), 479-529
- MSC: Primary 46M35; Secondary 46E30, 47B38, 47D15
- DOI: https://doi.org/10.1090/S0002-9947-1992-1081938-1
- MathSciNet review: 1081938