I am reading about the cyclic group of order 4, and it says that the group contains two operation of period 4. I don't understand why, it is because the identity element is also of period 4? or because the generators can be a clockwise and counterclockwise quarter-turns?
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closed as off topic by Gerry Myerson, Agol, Mariano Suárez-Alvarez, José Figueroa-O'Farrill, Leonid Positselski Mar 6 2011 at 0:31 |
