Christoffel formula for kernel polynomials on the unit circle

Cleonice F. Bracciali, Andrei Martínez-Finkelshtein, A. Sri Ranga +1

Given a nontrivial positive measure $\mu$ on the unit circle, the associated Christoffel-Darboux kernels are $K_n(z,w;\mu )={\sum }_{k=0}^n\overline{{\phi }_k(w;\mu )}{\phi }_k(z;\mu )$, $n \geq…