The unified mathematical model for evaluating geometrical errors is created with the theory of point set topology.
用点集拓扑学理论，建立了形位误差评定的统一数学模型。
The measurement in set theory, the properties of Metric Space, measurement Topology, Measurable Space, Perfect Metric Space and its application in first order circuit are explored in this paper.
本文论述了集合上的度量、度量空间的性质、度量拓扑、可度量化空间、完备度量空间、及一阶电路中的度量空间。
Furthermore the deeper properties of rough sets and topology are achieved by covering Spaces, and rough sets theory and topology have been enriched from the operator-oriented and set-oriented views.
利用覆盖空间，得到了粗糙集和拓扑中更深刻的性质，从算子论和集合论的角度丰富和深化了粗糙集与拓扑的内容。
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