Composition operators acting on Besov spaces on the real line
Composition operators acting on Besov spaces on the real line
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作用于实线上贝索夫空间的复合算子
DOI:
10.1007/s10231-013-0342-x
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
W. Sickel
中科院分区:
文献类型:
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作者:
G. Bourdaud;M. Moussai;W. Sickel
We study the composition operator $$T_f(g):= f\circ g$$ on Besov spaces $$B_{{p},{q}}^{s}(\mathbb{R })$$. In case $$1 < p< +\infty ,\, 0< q \le +\infty $$ and $$s>1+ (1/p)$$, we will prove that the operator $$T_f$$ maps $$B_{{p},{q}}^{s}(\mathbb{R })$$ to itself if, and only if, $$f(0)=0$$ and $$f$$ belongs locally to $$B_{{p},{q}}^{s}(\mathbb{R })$$. For the case $$p=q$$, i.e., in case of Slobodeckij spaces, we can extend our results from the real line to $$\mathbb{R }^n$$.