Definition 3.4.3 (Filter Base).label Let $X$ be a set, $\scr{F}$ a filter and $\scr{B}\suf \scr{F}$, then $\scr{B}$ is a filter base for $\scr{F}$ if
Definition 3.4.3 (Filter Base).label Let $X$ be a set, $\scr{F}$ a filter and $\scr{B}\suf \scr{F}$, then $\scr{B}$ is a filter base for $\scr{F}$ if
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