Interpolation of classical Lorentz spaces (Q1417878)

The aim of this paper is to give a description of the interpolation spaces \((\Lambda^{p_0}(\varphi_0), \Lambda^{p_1}(\varphi_1))_{\theta, q}\) using the definition of the Lorentz spaces involved in terms of the distribution function. Their main tool is to use the divisibility property of certain operators, with respect to the cone of decreasing functions, to identify the corresponding \(K\)-functional.