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- E81
[0KQ] Prerequisites:[0KM].Let \({\mathcal B}\) be a base for a topology \(π\) on \(X\). Show that, given \(xβ X\),
\[ \{ Bβ {\mathcal B} : xβ B\} \]
is a fundamental system of neighbourhoods for \(x\) . [ [0KR]]
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