Math 2.0

Group theory and generalizations Concept

Symmetry group

Summary

The symmetry group of an object is the group of all transformations of the ambient space that map the object onto itself. These transformations must keep the relevant structure of the object. The operation is composition of transformations. It is often written Sym⁡(X)\operatorname{Sym}(X) for an object XX.

Remarks

The symmetry group of a regular nn-gon in the plane is the dihedral group of order 2n2n. The rotations of a regular tetrahedron form a group isomorphic to the alternating group A4A_4. The symmetry group of an object is a subgroup of the group of all transformations of the ambient space.

Where this leads

7 pages build on this one.

Further reading

  1. Web https://en.wikipedia.org/wiki/Symmetry_group, lead section
  2. Web https://en.wikipedia.org/wiki/Symmetry_group, Symmetry groups in general
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