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Let A={α 1 ,α 2 ,...} be a sequence of numbers on the extended real line R=R {~} and μ a positive bounded Borel measure with support in (a subset of) R. We introduce rational functions φ n with poles {α 1 ,...,α n } that are orthogonal with respect to μ (if all poles are at infinity, we recover the polynomial situation). It is well known that under certain...
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