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A Sparse Flat Extension Theorem for Moment Matrices (0812.2563v1)
Published 15 Dec 2008 in cs.SC and math.AC
Abstract: In this note we prove a generalization of the flat extension theorem of Curto and Fialkow for truncated moment matrices. It applies to moment matrices indexed by an arbitrary set of monomials and its border, assuming that this set is connected to 1. When formulated in a basis-free setting, this gives an equivalent result for truncated Hankel operators.
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