EDB β€” 0J1

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[0J1] Prerequisites:[252].Let \(X\) be a set and \({\mathcal V}βŠ† {\mathcal P}(X)\) a family of parts of \(X\); we define \(𝜏\) as the intersection of all topologies that contain \(\mathcal V\) i.e.

\[ 𝜏{\stackrel{.}{=}}\underlineβ‹‚\{ 𝜎, πœŽβŠ‡ \mathcal V, 𝜎 \text{~ topology in ~ }X\} \]

Show that \(𝜏\) is a topology.

\(𝜏\) is the ”topology generated by \(\mathcal V\)”; it is also called ”the smallest topology that contains \(\mathcal V\)”.

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Book index
  • space, topological
  • topological space
  • \( \underline \bigcap \)
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