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arXiv 1406.0282math.FA
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矩序列的扩张刻画

A characterization of moment sequences by extensions

Konrad Schmüdgen

摘要:

将$\R^d$的闭半代数子集上的矩问题的纤维定理\cite{schm2003}推广到单生成实酉代数.给出了多项式代数$\R[x_1,\dots,x_d]$上的矩泛函的扩张刻画.这些结果被用来重新证明Stochel和Szafraniec \cite{stochelsz}和Bisgaard \cite{bisgaard}关于复矩问题的基本结果。

英文摘要:

The fibre theorem \cite{schm2003} for the moment problem on closed semi-algebraic subsets of $\R^d$ is generalized to finitely generated real unital algebras. A charaterization of moment functionals on the polynomial algebra $\R[x_1,\dots,x_d]$ in terms of extensions is given. These results are applied to reprove basic results on the complex moment problem due to Stochel and Szafraniec \cite{stochelsz} and Bisgaard \cite{bisgaard}.

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