Is Symmetry Limited in Geometry?

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    Geometry Symmetry
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Discussion Overview

The discussion revolves around the limitations of symmetry in geometry, particularly in relation to finite simple groups and their implications for 2D and 3D symmetrical geometric objects. Participants explore the nature of spatial symmetry within the confines of our three-dimensional world.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether the cardinality of the sets involved in finite simple groups affects the limitations of symmetrical geometric arrangements.
  • Another participant suggests that the sets related to these groups may be both finite and infinite, referencing simple groups of Lie type as an example that can have an infinite number of elements.
  • A different viewpoint notes that the answer regarding symmetry limitations is known for periodic structures, specifically in the context of crystallography, where a unit cell is repeated to form an infinite lattice.

Areas of Agreement / Disagreement

Participants express differing views on the implications of group theory for symmetry in geometry, indicating that multiple competing perspectives remain without a consensus.

Contextual Notes

The discussion touches on the relationship between group theory and geometric symmetry, but does not resolve the mathematical implications or the definitions of the sets involved.

Islam Hassan
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Given the complete classification of finite simple groups, can one say that the number of all conceivable 2D/3D symmetrical geometric objects/arrangement is limited?

Is spatial symmetry limited in our 3D world?


IH
 
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Islam Hassan said:
Given the complete classification of finite simple groups, can one say that the number of all conceivable 2D/3D symmetrical geometric objects/arrangement is limited?

Is spatial symmetry limited in our 3D world?

IH

Hello Islam Hassan and welcome to the forums.

The question that I have to ask that comes to mind is what the cardinality of the sets themselves involved in the groups you are talking about?

I don't know that much about group theory (finite or otherwise) but I do know that the sets relating to the associated groups you are referring to are going to have some kind of relation to your answer.
 
chiro said:
Hello Islam Hassan and welcome to the forums.

The question that I have to ask that comes to mind is what the cardinality of the sets themselves involved in the groups you are talking about?

I don't know that much about group theory (finite or otherwise) but I do know that the sets relating to the associated groups you are referring to are going to have some kind of relation to your answer.


I believe that the sets involved may be both finite and infinite; one category of finite simple group in the classification theorem are simple groups of Lie type which, if I recall correctly, can have an infinite number of elements.


IH
 
The answer is known for periodic structures where a "unit cell" is repeated to form an infinite 2D or 3D lattice.

The application in physics is crystallography.
 

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