Real interpolation and transposition of certain function spaces
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abstract
Our starting point is a lemma due to Varopoulos. We give a different proof of a generalized form this lemma, that yields an equivalent description of the K-functional for the interpolation couple (X 0,X 1) where X0=Lp0, (1; Lq( 2)) and X1=Lp1, (2; Lq(1)) where 0