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。
As applications, existence and uniqueness of a best simultaneous approximation element are studied.
本文证明了成对比较矩阵在相容性矩阵集合中的最佳逼近的存在性和不唯一性。
The existence of a best approximation of the pairwise comparison matrix from the set of consistent matrices is proved.
本文利用拓扑矢量空间中的连续线性泛函导入最佳逼近定义，给出了最佳逼近元的特征定理、存在性定理和唯一性定理。
In this paper the author introduces the definition of the best approximation in topological vector Spaces by use of continuous linear functionals.
应用推荐