Zeros extrêmaux de polynômes orthogonaux

On the “Favard theorem” and its extensions

“…Moreover, since the coe cients in (2.11) are real and n+j ¿ 0, the corresponding functional is positive deÿnite. Theorem 2.16 (Vinuesa and Guadalupe [26]; Nevai and Totik [18]). Let {x n } ∞ n=1 and {y n } ∞ n=1 be two sequences of real numbers such that…”