# Subbase

Let $(X,\tau)$ be a topological space. Then we say that a set $B \subset \tau$ of open sets is a *subbase of $(X,\tau)$* if the smallest topology containing $B$ is $\tau$.

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Let $(X,\tau)$ be a topological space. Then we say that a set $B \subset \tau$ of open sets is a *subbase of $(X,\tau)$* if the smallest topology containing $B$ is $\tau$.

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- This page was last edited on 28 August 2014, at 20:17.