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  • User guide
  • 1. Some set theory
  • 2. Metric spaces
  • 3. Open sets
  • 4. Basis, subbasis, subspace
  • 5. Closed sets
  • 6. Continuous functions
  • 7. Connectedness
  • 8. Path connectedness
  • 9. Separation axioms
  • 10. Urysohn lemma
  • 11. Tietze extension theorem
  • 12. Urysohn metrization theorem
  • 13. Metrization of manifolds
  • 14. Compact spaces
  • 15. Heine-Borel theorem
  • 16. Compact metric spaces
  • 17. Tychonoff theorem
  • 18. Compactification
  • 19. Quotient spaces

6. Continuous functions

Notes

  • Complete lecture notes
  • Blank lecture notes

Videos

Part 1 (pages 51-53)

Part 2 (pages 54-55)

Part 3 (pages 56-57)

Part 4 (pages 58-59)

Page links

  • Page 51: Continuous functions and closed sets.
  • Page 52: Continuous functions and sequences in metric spaces.
  • Page 53: Continuous functions and sequences in topological spaces.
  • Page 54: Composition of continuous functions. Open pasting lemma.
  • Page 55: Closed pasting lemma.
  • Page 56: Homeomorphisms: definition, basic properties.
  • Page 57: Equivalent definitions of a homeomorphism.
  • Page 58: Homeomorphic spaces. Examples.
  • Page 59: Stereographic projection.

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5. Closed sets
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7. Connectedness
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