Geodesic
Ranks of Homotopy Groups of Homogeneous Spaces
Matematičeskie zametki, Tome 86 (2009) no. 6, pp. 912-924.

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A simple way to evaluate the ranks of homotopy groups $\pi_j(M)$ is indicated for homogeneous spaces of the form $M=G/H$, where $G$ is a compact connected Lie group and $H$ is a connected regular subgroup or a subgroup of maximal rank in $G$. A classification of the spaces whose Onishchik ranks are equal to 3 is obtained. The transitive actions on the products of homogeneous spaces of the form $G/H$ are also described, where $G$ and $H$ are simple and $H$ is a subgroup of corank 1 in $G$ and the defect of the space $G/H$ is equal to 1.
Keywords: compact connected Lie group, homogeneous space, regular subgroup, rank of a group, Onishchik rank, Euler characteristic, semisimple group.
Mots-clés : homotopy group 
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A. N. Shchetinin. Ranks of Homotopy Groups of Homogeneous Spaces. Matematičeskie zametki, Tome 86 (2009) no. 6, pp. 912-924. http://geodesic.mathdoc.fr/item/MZM_2009_86_6_a9/

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