Université Paris 6, U.R.A. 754, Tour 46-0, Boîte 186, 4, place Jussieu, F-75252 Paris Cédex 05, France bourdaud@mathp7.jussieu.frMathematisches Institut, Fakultät für Mathematik und Informatik, Friedrich-Schiller-Universität, Leutragraben 1, 07743 Jena, Germany sickel@minet.uni-jena.de
Abstract: We determine the homeomorphisms $\varphi$ of the real line such that $f\circ\varphi$ belongs to $B_p^{s,q}$ whenever $f$ belongs to $ B_p^{s,q}$ (we consider the homogeneous and inhomogeneous Besov spaces on the real line, with $0<s<1$).
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