AlgTop1b: One-dimensional objects (cont.)

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Uploaded by on Jul 23, 2010

This is the second video of the first lecture of this beginner's course in Algebraic Topology. Here we begin to introduce basic one dimensional objects, namely the line and the circle. However each can appear in rather a remarkable variety of different ways.

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Uploader Comments (njwildberger)

  • So are both of those knots topologically equivalent to a circle or just the first?

  • Hi Toxie207, As topological spaces, they are both HOMEOMORPHIC to a circle. However as knots, neither are EQUIVALENT to a circle, and they are not equivalent to each other. So we see we must be careful about the meanings of the words homeomorphic and equivalent. In Lecture 2 we will discuss homeomorphism. Later we will discuss knots and equivalence.

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  • Fascinating lectures, jarring intro music :)

  • Thanks for creating this video. It's much appreciated.

  • @njwildberger Thanks. I studied homeomorphisms as part of my work on analysis of Banach Spaces. I imagine there are similarities. It is the concept of equivalence that I guess I'm struggling with.

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