Geodesic
Cartan angular invariant and deformations of rank 1 symmetric spaces
Sbornik. Mathematics, Tome 198 (2007) no. 2, pp. 147-169 Cet article a éte moissonné depuis la source Math-Net.Ru

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New geometric invariants in the quaternionic hyperbolic space and in the hyperbolic Cayley plane are introduced and studied. In these non-commutative and non-associative geometries they are a substitution for the Toledo invariant and the Cartan angular invariant well known in complex hyperbolic geometry. These new invariants are used for the investigation of quasi-Fuchsian deformations of quaternionic and octonionic hyperbolic manifolds. In particular, bendings are defined for such structures, which are the last two classes of locally symmetric structures of rank 1. Bibliography: 27 titles. 
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B. N. Apanasov; I. Kim. Cartan angular invariant and deformations of rank 1 symmetric spaces. Sbornik. Mathematics, Tome 198 (2007) no. 2, pp. 147-169. http://geodesic.mathdoc.fr/item/SM_2007_198_2_a0/

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