2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113991We find a finite CMV matrix whose eigenvalues coincide with the Dirichlet data of a circular periodic problem. As a consequence, we obtain circular analogues of the classical trace formulae for periodic Jacobi matrices.8 pagesSpectral TheoryClassical Analysis and ODEs42C05text