\[\int^{\infty}_{-\infty}{\left|\mathcal{H}\mskip-3.0muf\mskip 3.0mu\left(x%
\right)\right|}^{p}\,\mathrm{d}x\leq A_{p}\int^{\infty}_{-\infty}{\left|f(t)%
\right|}^{p}\,\mathrm{d}t,\]