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。
An equivalent characterization of Haar condition is given in this paper, which guarantees the existence and uniqueness of best uniform approximation.
给出了保证最佳一致逼近元唯一存在的哈尔条件的等价定义。
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