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arxiv: math/0406309 · v1 · submitted 2004-06-15 · 🧮 math.GM · math.CO

Correction to a theorem of Schoenberg

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keywords generatessequencetheoremgiveschoenbergthencorrectcorrection
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A well-known theorem of Schoenberg states that if f(z) generates a PF_r sequence then 1/f(-z) generates a PF_r sequence. We give two counterexamples which show that this is not true, and give a correct version of the theorem. In the infinite limit the result is sound: if f(z) generates a PF sequence then 1/f(-z) generates a PF sequence.

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