Abstract
Ratio asymptotics for orthogonal polynomials on the unit circle is characterized in terms of the existence of limn |Φn(0)| and {limn [Φn+1(0)/Φn(0)] , where \( \{\Phi_n(0)\}_{n \geq 0} \) denotes the sequence of reflection coefficients. The limit periodic case, that is, when these limits exist for n = j mod k , j = 1, . . ., k , is also considered.
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