Geodesic
On the relation between complex and real methods of interpolation
Studia Mathematica, Tome 125 (1997) no. 3, pp. 201-218

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DOI

We study those compatible couples of Banach spaces for which the complex method interpolation spaces are also described by the K-method of interpolation. As an application we present counter-examples to Cwikel's conjecture that all interpolation spaces of a Banach couple are described by the K-method whenever all complex interpolation spaces have this property. 
Mieczysław Mastyło. On the relation between complex and real methods of interpolation. Studia Mathematica, Tome 125 (1997) no. 3, pp. 201-218. doi: 10.4064/sm-125-3-201-218
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