Abstract
We prove sharp embeddings of Besov spaces B with the classical smoothness a and a logarithmic smoothness a into Lorentz-Zygmund spaces. Our results extend those with a = 0, which have been proved by D. E. Edmunds and H. Triebel. On page 88 of their paper (Math. Nachr. 207 (1999), 79-92) they have written: Nevertheless a direct proof, avoiding the machinery of function spaces, would be. desirable. In our paper we give such a proof even in a more general context. We cover both the sub-limiting and the limiting cases and we determine growth envelopes of Besov spaces with logarithmic smoothness.
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