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We study two conjectural identities involving roots of unity and determinants of Hermitian matrices which have been recently proved by using the famous eigenvector-eigenvalue identity for normal matrices. In this note, we extend these identities to a general form by considering the class of circulant matrices suggested by Petrov. Furthermore, we give another proof to Sun's identities independent of the eigenvector-eigenvalue identity, where our strategy is built upon the similarity of an unnecessarily normal matrix to a particular one with integer eigenvalues, derived from the Fourier transform vectors suggested by Petrov.

Author

Liu, Keqin

Published

2022

Language

EN