Category:Neighborhood Bases
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This category contains results about Neighborhood Bases.
Let $\struct {S, \tau}$ be a topological space.
Let $x \in S$.
Let $\BB$ be a set of neighborhoods of $x$.
Then $\BB$ is a neighborhood basis at $x$ if and only if:
- For each neighborhood $N$ of $x$, there is an $M \in \BB$ such that $M \subseteq N$.
Pages in category "Neighborhood Bases"
The following 5 pages are in this category, out of 5 total.