... weakly closed set 弱闭界集（合） weakly closed space 弱闭空间 weakly coercive mapping 弱强制映射 ...
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仿弱S-闭空间 para-weakly S-closed spaces
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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。
In the inner product space, the existence theory of best approximation element was obtained and described.
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