The method of mappings and covers is a basic tool to study general topology.
映射与覆盖的方法是研究一般拓扑学的基本工具。
It is good extension of connectedness in general topology and it is productive.
它是一般拓扑中连通性的好的推广且是可乘的。
It is good extension of connectedness in general topology and it is productive.
它是一般拓扑中连通性的好的推广且是可乘的。
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