Kronecker product:
Given two matrices \(\mathbf{A}\) and \(\mathbf{B}\), of sizes \(m\times n\) and \(p\times q\) respectively, the Kronecker product \(\mathbf{A}\otimes\mathbf{B}\) is a block matrix of the size \(mp\times nq\):
\[\mathbf{A}\otimes\mathbf{B}=\begin{bmatrix} a_{11} \mathbf{B} & \cdots & a_{1n}\mathbf{B} \\ \vdots & \ddots &\vdots \\ a_{m1} \mathbf{B} & \cdots & a_{mn} \mathbf{B}\end{bmatrix}\]
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