Observations sur l'introduction d'une métrique dans le plan affin
On a conjecture of G. Bol.
On a problem of W. J. Firey in connection with the characterization of spheres.
On a Theorem of Chern and Terng on Affine Surfaces.
On affine geometric product objects
On affine-maximal ruled surfaces.
On equiaffine Weingarten surfaces
On null geodesic collineations in some Riemannian spaces
On Riemann-Poisson Lie groups
A Riemann-Poisson Lie group is a Lie group endowed with a left invariant Riemannian metric and a left invariant Poisson tensor which are compatible in the sense introduced in [4]. We study these Lie groups and we give a characterization of their Lie algebras. We give also a way of building these Lie algebras and we give the list of such Lie algebras up to dimension 5.
On some properties of induced almost contact structures
Real affine hypersurfaces of the complex space with a J-tangent transversal vector field and an induced almost contact structure (φ,ξ,η) are studied. Some properties of the induced almost contact structures are proved. In particular, we prove some properties of the induced structure when the distribution is involutive. Some constraints on a shape operator when the induced almost contact structure is either normal or ξ-invariant are also given.
On the affine convexity of convex curves and hypersurfaces.
On the affine normal
On the affine rectification of convex curves.
On the Cartan-Norden theorem for affine Kähler immersions
In [O2] the Cartan-Norden theorem for real affine immersions was proved without the non-degeneracy assumption. A similar reasoning applies to the case of affine Kähler immersions with an anti-complex shape operator, which allows us to weaken the assumptions of the theorem given in [NP]. We need only require the immersion to have a non-vanishing type number everywhere on M.
On the Fundamental Theorem for Non-Degenerate Complex Affine Hypersurface Immersions.
On the Geometry of Affine Immersions.
On the mathematical work of Gheorge Tzitzeica.
On the Pick invariant
On the solution of the variational problem of the arc length in 4-dimensinal affine space.