A single abstract theorem about pairs of interpolators unifies the commutator theorems of Cwikel-Kalton-Milman-Rochberg, Carro-Cerda-Soria, and translation operators, together with new symmetry, stability, and incomparability results.
On the stability of the differential process generated by complex interpolation
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abstract
We study the stability of the differential process of Rochberg and Weiss associated to an analytic family of Banach spaces obtained using the complex interpolation method for families. In the context of K\"othe function spaces we complete earlier results of Kalton (who showed that there is global bounded stability for pairs of K\"othe spaces) by showing that there is global (bounded) stability for families of up to three K\"othe spaces distributed in arcs on the unit sphere while there is no (bounded) stability for families of four or more K\"othe spaces. In the context or arbitrary pairs of Banach spaces we present local stability results and global isometric stability results.
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2019 1verdicts
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Differential processes generated by two interpolators
A single abstract theorem about pairs of interpolators unifies the commutator theorems of Cwikel-Kalton-Milman-Rochberg, Carro-Cerda-Soria, and translation operators, together with new symmetry, stability, and incomparability results.