All quadratic functions have the same type of curved graphs with a line of symmetry. The graph of the quadratic function \(y = ax^2 + bx + c \) has a minimum turning point when \(a \textgreater 0 \) ...

The estimation of quadratic functions of a multivariate normal mean is an inferential problem which, while being simple to state and often encountered in practice, leads to surprising complications ...

Abstract: Many applications require minimizing the sum of quadratic and nonconvex nonsmooth functions. This problem is commonly referred to the scaled proximal operator. Despite its simple formulation ...