An estimate for the composition of rough singular integral operators
Canadian mathematical bulletin, Tome 64 (2021) no. 4, pp. 911-922

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Let $\Omega $ be homogeneous of degree zero and have mean value zero on the unit sphere ${S}^{d-1}$, $T_{\Omega }$ be the convolution singular integral operator with kernel $\frac {\Omega (x)}{|x|^d}$. In this paper, we prove that if $\Omega \in L\log L(S^{d-1})$, and U is an operator which is bounded on $L^2(\mathbb {R}^d)$ and satisfies the weak type endpoint estimate of $L(\log L)^{\beta }$ type, then the composition operator $UT_{\Omega }$ satisfies a weak type endpoint estimate of $L(\log L)^{\beta +1}$ type.
DOI : 10.4153/S0008439520000946
Mots-clés : Rough singular integral operator, composite operator, weak type endpoint estimate
Tao, Xiangxing; Hu, Guoen. An estimate for the composition of rough singular integral operators. Canadian mathematical bulletin, Tome 64 (2021) no. 4, pp. 911-922. doi: 10.4153/S0008439520000946
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     title = {An estimate for the composition of rough singular integral operators},
     journal = {Canadian mathematical bulletin},
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     year = {2021},
     volume = {64},
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     doi = {10.4153/S0008439520000946},
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