For a truncated matrix moment problem, we describe in detailthe set of positive definite matrices of measures $mu$ in $V_{2n}$ (this isthe set of solutions of the problem of degree $2n$) for which the polynomialsup to degree $n$ are dense in the corresponding space ${cal L}^2(mu)$.These matrices of measures are exactly the extremal measures of the set $V_n$.
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机译：对于截断的矩阵矩问题，我们详细描述了$ V_ {2n} $中的正定度量矩阵$ mu $的集合（这是度为$ 2n $的问题的解的集合），其多项式为度为$ n $在对应的空间$ {cal L} ^ 2（mu）$中是密集的。这些度量矩阵恰好是集合$ V_n $的极值度量。
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