The extremal truncated moment problem

Details The extremal truncated moment problem The extremal truncated moment problem

2006-10-28

arxiv.org/abs/math/0610882v1

Mathematics

Functional Analysis

Scientific paper

For a degree 2n real d-dimensional multisequence \beta^(2n) to have a representing measure, it is necessary for the associated moment matrix M(n) to be positive semidefinite and for the algebraic variety V = V(\beta) associated to \beta to satisfy rank M(n) <= card V as well as the following consistency condition: if a polynomial p vanishes on V, then p(\beta) = 0. We prove that for the extremal case (rank M(n) = card V), positivity of M(n) and consistency are sufficient for the existence of a (unique, rank M(n)-atomic) representing measure. We also show that in the preceding result, consistency cannot always be replaced by recursiveness of M(n).

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