“…When p = u or τ = 0 we obtain the usual Besov and Triebel-Lizorkin spaces defined on domains. In [10] we studied the extension operator of spaces A s,τ p,q ( ) and studied limiting embeddings. We obtained, for instance, that -in addition to the monotonicity in the smoothness parameter s and the fine index q, as recalled in (2.3) and (2.4), respectively, -there is some monotonicity in τ , too: we proved that A s,τ 1 p,q ( ) → A s,τ 2 p,q ( ) when 0 ≤ τ 2 ≤ τ 1 , cf.…”