Neighbourhood system

In topology and related areas of mathematics, the neighbourhood system, complete system of neighbourhoods, or neighbourhood filter $\mathcal{V}(x)$ for a point x is the collection of all neighbourhoods for the point x.

单词	Complete system of neighborhoods
释义	Complete system of neighborhoods 英语百科 Neighbourhood system In topology and related areas of mathematics, the neighbourhood system, complete system of neighbourhoods, or neighbourhood filter $\mathcal{V}(x)$ for a point x is the collection of all neighbourhoods for the point x.
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Complete system of neighborhoods

Neighbourhood system