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What is the definition of Kronecker product?
Definition of Kroneck product:

Kronecker product is an operation between two matrices of arbitrary size. Kronecker product is a special form of tensor product, named after German mathematician Leopold Kronecker.

For example:

If a is the matrix of m x n and b is the matrix of p x q, then Kronecker product is the matrix of mp x nq, as shown in the figure: