ext provides the quadratic bound for strongly convex functions: a twice continuously differentiable function \\( f : \\mathbb{R}^d \\to \\mathbb{R} \\) is \\( m \\)-strongly convex if and only if \\( f(y) \\geq f(x) + \\nabla f(x)^T(y - x) + \\frac{m}{2}\\|y - x\\|^2 \\), for all \\( x, y \\in \\mathbb{R}^d \\).";
                    case 7:
                        return "The text shows that the projection of \\( x \\) onto \\( D \\), \\( \\mathrm{proj}_D(x) \\), is the unique minimizer of the strongly con