A generalized version of Holmstedt's formula for the K-functional
Irshaad Ahmed, Alberto Fıorenza, Амиран Гогатишвили · arXiv (Cornell University) · 2024
Let $(A_0, A_1)$ be a compatible couple of quasi-normed spaces, and let $Φ_0$ and $Φ_1$ be two general parameters of $K$-interpolation method. We compute $K$-functional for the couple $((A_0,A_1)_{Φ_0}, (A_0, A_1)_{Φ_1})$ in terms of $K$-functional for the couple $(A_0, A_1)$.