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the normalized '''[[boxcar function]]''') is defined as
:<math>\mathbf{rect}(t) = \sqcap(t) = \left \{ \begin{matrix}
0 & \mbox{if } |t| > \frac{1}{2} \\[3pt]
\frac{1}{2} & \mbox{if } |t| = \frac{1}{2} \\[3pt]
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