Are S^1 x S^2 & Familiar Topological Spaces Related?

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    Circle Sphere
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Discussion Overview

The discussion revolves around the relationship between the product space S^1 × S^2 and more familiar topological spaces. Participants explore the visualization of this space and its mappings, particularly in the context of smooth maps and knot theory.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions whether S^1 × S^2 is related to more familiar topological spaces, seeking insights on visualizing this product space.
  • Another participant suggests visualizing S^2 as a thickened unit sphere in ℝ³, proposing a method to understand the structure of S^1 × S^2.
  • A participant discusses smooth maps from S^1 × S^2 to S^2, noting that the preimage of a point can be a union of circles, which may be linked, raising questions about visualizing knots in this context.
  • One participant expresses a lack of useful input regarding the visualization of knots in S^1 × S^2, indicating the complexity of the topic.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants present different approaches to visualization and understanding of the product space, with some expressing uncertainty about the topic.

Contextual Notes

Participants mention challenges in visualizing the product space and its mappings, indicating potential limitations in their understanding and the complexity of the relationships involved.

owlpride
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circle x sphere = ?

Is the product space S^1 \times S^2 related (e.g. homeomorphic or homotopy equivalent) to a more familiar topological space? I am currently looking at maps from S^1 \times S^2 into other spaces, and I am having a really hard time visualizing what I am doing. Any thoughts appreciated.
 
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Since you can visualize S^1 and S^2 by themselves, you should be able to get good impression of the whole space. Or du you need to actually see it?

How about this: Consider S^2 as the unit sphere |x|=1 in \mathbb{R}^3. Then just make it thicker, and identify points on the outer edge with points on the inner edge (along the radius).

Torquil
 


Well, I am looking at smooth maps f: S^1 \times S^2 \rightarrow S^2. Then f^{-1}(z) is a union of circles, which may or may not be linked. How exactly would I go about visualizing knots in S^1 \times S^2, and especially their relative position to each other?
 


owlpride said:
Well, I am looking at smooth maps f: S^1 \times S^2 \rightarrow S^2. Then f^{-1}(z) is a union of circles, which may or may not be linked. How exactly would I go about visualizing knots in S^1 \times S^2, and especially their relative position to each other?

Sorry, I don't have anything useful to say about that.

Torquil
 

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