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                <details class="question" open="open"><summary>Ex. 18.6</summary><p>Show how the theorem in Section 18.3.5 can be applied to regularized discriminant analysis [Section 4.14 and Equation (18.9)].</p>
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<details class="done"><summary>Soln. 18.6</summary><p>Here we recap Section 4.5 in \cite{hastie2004efficient}, where the authors discussed applying the theorem to regularized discriminant analysis in detail.</p>
