... finite point-grid element method 网格元法的数值方法 ; 有限点集 ; 点集 point finite 点有限 point finite cover 点有限覆盖 ...
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A space X is nearly metacompact if and only if every monotone open cover U has an open refinement that is point-finite on some dense subset of X;
空间X是几乎亚紧的当且仅当X的每一单调开覆盖U有一个开加细,且在X的某一稠密子集上是点有限的;
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