It is known that bessel potential spaces $H^{s,p}$ coincide with Triebel-Lizorkin spaces $F^{s}_{p,2}$ for $s\in \mathbb{R}$ and $1<p<\infty$. Im wondering what can be said por $p=1$ and $p=\infty$. There is a nice relationship between such spaces? If not, there is some characterization for $H^{s,1}$ as an interpolation space and with the classical Sobolev spaces $W^{s,1}$ when $s$ is an integer? Thanks in advance
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