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Level 2
Level 2 requires school mathematics. Suitable for pupils.

Illustration Elements of a topology

Total set and empty set as elements of a topology
Intersections as elements of a topology
Union sets as elements of a topology
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The elements of a topology \(\class{blue}{\mathcal{T}}\) of a topological space \( (\mathbb{X}, \class{blue}{\mathcal{T}}) \) must satisfy three properties:

  1. The empty set \( \emptyset \) and the whole set \(X\) are both inside \(\mathcal{T}\).
  2. The union of any (even infinitely many) elements \(\mathbb{T}_i\) of \(\class{blue}{\mathcal{T}}\) is also an element of \(\class{blue}{\mathcal{T}}\).
  3. The intersection of finitely many elements \(\mathbb{T}_i\) of \(\class{blue}{\mathcal{T}}\) is also an element of \(\class{blue}{\mathcal{T}}\).
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  • License: CC BY 4.0This illustration may be used with indication of the copyright!
  • Copyright: © 2021
  • This illustration was uploaded by FufaeV on .
  • This illustration was updated by FufaeV on .