32:33

What is a closed set ?

27:26

This open problem taught me what topology is

9:41

What is a Topological Space?

20:58

journey into fractals: the Cantor set and ternary expansion.

29:57

What is a Manifold? Lesson 1: Point Set Topology and Topological Spaces

17:36

Continuity in Topology

14:24

Topology Definitions: Closure, Boundary, Interior

22:38

Compactness