How to prove the this Sobolev-like inequality presented in the paper “Sobolev inequalities in disguise” one page from the paper strong text What I cannot really clearly understands is the content bellow: the inequality proof wanted $ $ N^{\rho}_{r,u}(f) \le (N^{\rho}_{s,v}(f))^\vartheta (N^{\rho}_{t,w}(f))^(1-\vartheta)$ $ with $ $ \frac1r=\frac\vartheta{s}+\frac{1-\vartheta}t \text{ and }\frac1u=\frac\vartheta{u}+\frac{1-\vartheta}w, 0\le\vartheta\le1$ $ This can beRead more