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

βˆƒk∈Xβˆ€j∈X,jβ‰₯kβ‡’j∈U .

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