\begin{align}
A_0 &= \begin{bmatrix} A_{00} & A_{01} \\
A_{10} & A_{11}
\end{bmatrix}\\
b_0 &= 2\mathbb{R}(a*c\mathbf{1}^TA)+2\mathbb{R}(b*c\mathbf{1}^TA)\\
c_0 &= |c|^2\Sigma_{i,j}A_{ij}, 
\end{align}
