Two kinds of vector measures in a product space are given in the theorem 2.

本文用两种不同的积分概念直接地给出了乘积空间上的两类向量测度,即定理2.

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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.

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