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For on-topic questions involving the Hessian matrix, a square matrix generalizing the second derivative. Please include also a statistical methods tag. For purely mathemathical questions about the Hessian it is better to ask on math.SE at https://math.stackexchange.com/.

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I have question about the $R\{.\}$ function in Bishop's book on page 254 (see snippet below). My questions are as follows: I assume $R\{\bf w\}$ in (5.97) is the premultiplication of $\bf{v}^{T}$ …
asked Sep 20 '17 by user173192
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I am trying to understand the abstract below from Pearlmutter's paper. Can someone clarify to me why $R_{\bf{v}}\{\bf{w}\}=\bf{v}$? Thanks a lot!
asked Sep 20 '17 by user173192