Resumen de Posinormal factorable matrices with a constant main diagonal

H.C. Rhaly Jr, B.E. Rhoades

• Sufficient conditions are found for a posinormal factorable matrix with a constant main diagonal to be hyponormal. Those conditions are satisfied by some Toeplitz matrices, and a non-Toeplitz example is also presented. Along the way, a more general result is also obtained.