Hörmander kernels map mean-zero functions supported in $\bar B(c,r)$ to $L^1$ off $B(c,2r)$ with norm $\le B\|b\|_1$

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Hörmander kernels map mean-zero functions supported in $\bar B(c,r)$ to $L^1$ off $B(c,2r)$ with norm $\le B\|b\|_1$ · Prove2Me