Reiteration formulae for the real interpolation method including \(\mathcal{L}\) or \(\mathcal{R}\) limiting spaces (Q2220526)

Summary: We consider a real interpolation method defined by means of slowly varying functions. We present some reiteration formulae including so-called \(\mathcal{L}\) or \(\mathcal{R}\) limiting interpolation spaces. These spaces arise naturally in reiteration formulae for the limiting cases \(\theta=0\) or \(\theta=1\). Applications to grand and small Lorentz spaces are given.