Preliminaries A calligraphic letter \({\mathcal{X}}\) indicates a set, an italic uppercase letter X denotes a graph, uppercase X denotes a matrix, lowercase x denotes a vector, and a monospaced letter X indicates a tuple. Uppercase letter \({\mathsf{X}}\) indicates a random variable, and lowercase letter \({\mathsf{x}}\) indicates its corresponding value; bold uppercase \({\boldsymbol{\mathsf{X}}}\) denotes a set of random variables, and lowercase …
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