给出了一类多元线性正算子线性组合在一致逼近意义下的特征刻划。
Weighted approximation by a class of linear combinations of Bernstein type operators;
运用L2空间上的线性算子理论，我们证明了这类算子存在至多可数个正的本征值。
By using linear operator theory in L2 space, we proved that the operators of this kind has not more than denumerable positive eigenvalues.
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