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Notation
\(\pmb{x}\) a vector
\(\pmb{X}\) a matrix
\(\pmb{x}^T\) the transpose of a vector \(\pmb{x}\)
\(\pmb{X}^T\) the transpose of a matrix \(\pmb{X}\)
\(\omega\) a parameter
\(\widehat{\omega}\) an estimator of a parameter \(\omega\)