Geodesic
Curvature tensors and Singer invariants of four-dimensional homogeneous spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 40 (1999) no. 4, pp. 723-733.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

We show that the Singer invariant of a four-dimensional homogeneous space is at most $1$.
Classification : 53C20, 53C30
Keywords: homogeneous spaces; Singer invariant 
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Kiyota, Yuki; Tsukada, Kazumi. Curvature tensors and Singer invariants of four-dimensional homogeneous spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 40 (1999) no. 4, pp. 723-733. http://geodesic.mathdoc.fr/item/CMUC_1999__40_4_a9/