EDB β€” 231

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Definition 101

[231] If \(X\) is filtering, ”a neighborhood of \(∞\) in \(X\)” is a subset \(UβŠ† X\) such that

\[ βˆƒ k∈ X βˆ€ j∈ X,jβ‰₯ k β‡’ j∈ U~ . \]

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  • neighborhood, of infinity
  • order, directed
  • order, with filtering property
  • order
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