Geodesic
Flag Manifolds
Zbornik radova, Tome 6 (1997) no. 14, p. 3 
D. V. Alekseevsky. Flag Manifolds. Zbornik radova, Tome 6 (1997) no. 14, p. 3 . http://geodesic.mathdoc.fr/item/ZR_1997_6_14_a2/
@article{ZR_1997_6_14_a2,
     author = {D. V. Alekseevsky},
     title = {Flag {Manifolds}},
     journal = {Zbornik radova},
     pages = {3 },
     year = {1997},
     volume = {6},
     number = {14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZR_1997_6_14_a2/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Recall that a Lie group is a smooth maniford $G$ together with structure of a group such that the group operations $\mu:Gimes G\rightarrow G,\;\;(g_1,g_2)\rightarrow g_1\cdot g_2$ $i:G\rightarrow G,\;\;g\rightarrow g^{-1}$ are smooth mappings.