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.
@article{bwmeta1.element.bwnjournal-article-smv125i3p201bwm, author = {Mieczys\l aw Masty\l o and Vladimir Ovchinnikov}, title = {On the relation between complex and real methods of interpolation}, journal = {Studia Mathematica}, volume = {122}, year = {1997}, pages = {201-218}, zbl = {0910.46058}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv125i3p201bwm} }
Mastyło, Mieczysław; Ovchinnikov, Vladimir. On the relation between complex and real methods of interpolation. Studia Mathematica, Tome 122 (1997) pp. 201-218. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv125i3p201bwm/
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