Some calculus of the composition of functions in Besov-type spaces

M. Moussai and M. Saadi

Abstract: In the Besov-type spaces $B^{s,\tau}_{p,q}(R^n)$, we will prove that the composition operator $T_f: g \to f \circ g$ takes both $B^{s}_{\infty,q}(R^n)\cap B^{s,\tau}_{p,q}(R^n)$ and $W^1_{\infty}(R^n)\cap B^{s,\tau}_{p,q}(R^n)$ to $B^{s,\tau}_{p,q}(R^n)$, under some restrictions on $s, \tau, p,q$, and if the real function $f$ vanishes at the origin and belongs locally to $B^{s+1}_{\infty, q}({R})$.

Keywords: Besov spaces; Besov-type spaces; Littlewood-Paley decomposition; composition operator.

Classification (MSC2000): 46E35

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