Acknowledgment. I would like to thank J.E Chac´on for pointing me towards the question of the square roots of matrices for the Kronecker product. I also thank the anonymous referee for the comments and useful suggestions.
Acknowledgment.I would like to thank J.E Chac´on for pointing me towards the question of the square roots ofmatrices for the Kronecker product. I also thank the anonymous referee for the comments and usefulsuggestions.