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 Feb18 awarded Popular Question Mar21 awarded Popular Question Jan29 awarded Student Jan29 asked 3D Numerical differentiation with spline approximation Oct21 accepted Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript Oct17 awarded Teacher Oct17 answered Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript Oct17 awarded Editor Oct17 revised Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript added 169 characters in body Oct16 comment Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript "Ordered subsets algorithms for transmission tomography" by Erdogan and Fessler. Phys. Med. Biol. 44 (1999) 2835–2851 Oct16 asked Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript May25 accepted Linear algebra norm notation May25 comment Linear algebra norm notation Yes, you are right. The paper does mention that the elements of $\mathbf{D}$ are positive. So you are saying that $\mathbf{D}$ does not have to be diagonal, right? May25 comment Linear algebra norm notation Ok. I understand that the superscript 2 means "squared." I can also see why this expressions is natural. My only question was about the subscript $D$. I think your answer makes sense i.e the author defined the $||x||_D$ as $x^T D x$. I was just wondering if this operation had a particular name. Thanks! May25 asked Linear algebra norm notation Apr24 awarded Scholar Apr24 accepted Can the joint PDF of two random variables be computed from their marginal PDFs? Apr24 comment Can the joint PDF of two random variables be computed from their marginal PDFs? Ok. So in the example that I provided, since we know X and Y are Gaussian with a certain correlation coefficient, we can find their joint PDF, right? Thank you. Things are clearer now Apr24 asked Can the joint PDF of two random variables be computed from their marginal PDFs?