 Weak type (1,1) (source code)

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= Weak type (1,1)
{title2=$\mu\{Sf>\lambda\}\leq C\|f\|_1/\lambda$}

For a nonnegative <sublinear operator>, weak type $(1,1)$ is the displayed level-set bound for all integrable inputs and positive thresholds. It supplies an exceptional-set estimate for approximation errors; the <uncentered maximal weak-type inequality> is a central example.

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