= Cancellation estimate outside a dilated cube
If $K$ obeys the <Hörmander integral kernel condition> with constant $C$, and an integrable $b$ is supported in a cube $Q$ with $\int b=0$, then $\int_{(LQ)^c}|K*b|\leq C\|b\|_1$ for $L=4\sqrt d$. Here $LQ$ is the concentric cube with multiplied side length. Subtract the kernel value at the cube center inside the <convolution>; outside $LQ$, every source displacement is smaller than half the observation displacement. <Tonelli theorem> and the integral kernel condition give the bound.
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