... 最佳检验：optimum hypothesis testing 最佳逼近元素：element of best approximation 最佳逼近多项式：best polynomial approximation ...
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In the inner product space, the existence theory of best approximation element was obtained and described.
获得了内积空间关于弱闭凸集的最佳逼近元的存在性及其刻划定理。
As applications, existence and uniqueness of a best simultaneous approximation element are studied.
同时，作为应用，研究了最佳联合逼近元的存在性与唯一性问题。
The unique existence of the best element of approximation is proved and the formula of the best element of approximation is given.
证明了最佳逼近元的唯一存在性，并给出了最佳逼近元的计算公式。
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