Gyration

This article is about rotational symmetry in mathematics. For the size measure in structural engineering, see radius of gyration. For the motion of a charged particle in an magnetic field, see gyroradius. For the tensor of second moments, see gyration tensor.

In geometry, a gyration is a rotation in a discrete subgroup of symmetries of the Euclidean plane such that the subgroup does not also contain a reflection symmetry whose axis passes through the center of rotational symmetry. In the orbifold corresponding to the subgroup, a gyration corresponds to a rotation point that does not lie on a mirror, called a gyration point.[1]

References

  1. ↑ Liebeck, Saxl. Groups, Combinatorics & Geometry. Durham. Retrieved 7 August 2010.


This article is issued from Wikipedia - version of the Sunday, May 04, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.