Equal Groups
The following groups are isomorphic:
- 1* and *11
- 22 and 221
- *22 and *221
- 2* and 2*1.
This is because 1-fold rotation is the "empty" rotation.
Read more about this topic: Orbifold Notation
Famous quotes containing the words equal and/or groups:
“Doubts of all things earthly, and intuitions of some things heavenly; this combination makes neither believer nor infidel, but makes a man who regards them both with equal eye.”
—Herman Melville (1819–1891)
“In America every woman has her set of girl-friends; some are cousins, the rest are gained at school. These form a permanent committee who sit on each other’s affairs, who “come out” together, marry and divorce together, and who end as those groups of bustling, heartless well-informed club-women who govern society. Against them the Couple of Ehepaar is helpless and Man in their eyes but a biological interlude.”
—Cyril Connolly (1903–1974)