Geodesic
More about Embeddings of Almost Homogeneous Heisenberg Groups
Journal of Lie theory, Tome 13 (2003) no. 2, pp. 443-455.

Voir la notice de l'article provenant de la source Heldermann Verlag

Heisenberg groups are simply connected nilpotent Lie groups of class 2. A group is called almost homogeneous if its automorphism group acts with at most 3 orbits. Several open problems about the existence of embeddings between almost homogeneous Heisenberg groups have been posed in a previous paper by the second author [J. Lie Theory 10 (2000) 443-453]. Most of these problems are solved. 
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     title = {More about {Embeddings} of {Almost} {Homogeneous} {Heisenberg} {Groups}},
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J. Hoheisel; M. Stroppel . More about Embeddings of Almost Homogeneous Heisenberg Groups. Journal of Lie theory, Tome 13 (2003) no. 2, pp. 443-455. http://geodesic.mathdoc.fr/item/JLT_2003_13_2_JLT_2003_13_2_a7/