# 爱尔兰根纲领

## 从爱尔兰根纲领的抽象的回归

${\displaystyle O(n,1)/\mathbb {Z} _{2}}$,

## 参考

An inexpensive book that's still in print, not too difficult, with many references to Lie, Klein and Cartan. P. 139, "A Klein geometry is the theory of geometric invariants of a transitive transformation group（Erlangen program, 1872）".

• Felix Klein, 1872. "Vergleichende Betrachtungen über neuere geometrische Forschungen"（'A comparative review of recent researches in geometry'）,

Mathematische Annalen, 43 (1893) pp. 63-100（Also: Gesammelte Abh. Vol. 1, Springer, 1921, pp. 460-497）. An English translation by Mellen Haskell appeared in Bull. N. Y. Math. Soc 2 (1892-1893): 215--249. German text of the Erlangen Program can be viewed at the University of Michigan online collection. [1]