6: Perception

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( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\)

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\( \newcommand{\vectorAt}[1]{\vec{\text{#1}}}      % arrow\)

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\(\newcommand{\longvect}{\overrightarrow}\)

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\(\newcommand{\qmvec}[1]{\mathbf{\vec{#1}}}\)
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