Which branch of topology to study

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Discussion Overview

The discussion centers around which branch of topology is most relevant for gaining a rough understanding of General Relativity. Participants explore the relationship between topology and differential geometry, and the necessity of studying different branches of topology for this purpose.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant identifies four types of topology: General, Algebraic, Differential, and Geometrical, and questions which to study for General Relativity.
  • Another participant suggests that only a minimal understanding of topology is needed, emphasizing the importance of differential geometry instead.
  • A third participant argues that a solid grasp of differential geometry does not require extensive knowledge of topology, suggesting that the focus should be on advanced calculus and differential geometry.
  • A fourth participant introduces the concept of point-set topology, describing it as foundational to topology and relevant to understanding continuity and related concepts, but questions its classification in relation to manifolds.
  • This participant also mentions that while point-set topology is not typically seen as a separate branch, it is still relevant for understanding the mathematical foundations of General Relativity.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and relevance of studying various branches of topology for understanding General Relativity. There is no consensus on which branch is most appropriate or how much topology is needed.

Contextual Notes

Some participants note that the definitions and classifications of topology may vary, and there is uncertainty regarding the role of point-set topology in relation to manifolds and its relevance to physics versus mathematics.

shounakbhatta
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Hello,

I learned that there are 4 types of approach to topology:

(1) General
(2) Algebraic
(3) Differential
(4) Geometrical

To have a rough understanding of General relativity, which branch of topology should I study?

Thanks.
 
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To have a rough understanding you need very little topology. What you need to study is differential geometry.
 
Oh, dear. You're thinking way too far. General Relativity is mathematically founded on differential geometry and advanced calculus. To study differential geometry at a decent level, you don't need too much topology (certainly not spitted per branches).
 
The foundational elements of topology are of some interest, Wolfram mathematics calls this "point set topology". This is the part of topology before you split off into branches.

Wolfram said:
Point-Set Topology

The low-level language of topology, which is not really considered a separate "branch" of topology. Point-set topology, also called set-theoretic topology or general topology, is the study of the general abstract nature of continuity or "closeness" on spaces. Basic point-set topological notions are ones like continuity, dimension, compactness, and connectedness.

Wolfram doesn't mention the definition of a manifold as part of point-set topology though that's something you might want to know :-). (I'm think it would be classified as part of point-set topology, but I could be mistaken as my focus is on the physics. Wolfram doesn't mention it.)

Wald, "General Relativity", for instance, has enough point set topology to give you a definition of a manifold in one of his appendices. A full study of it would probably be overkill if you are into the physics rather than the math.
 

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