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Géométrie systolique et métriques polyèdrales sur les 3-variétés de Bieberbach

Chady El Mir (2008/2009)

Séminaire de théorie spectrale et géométrie

La systole d’une variété riemannienne compacte non simplement connexe est la plus petite longueur d’une courbe fermée non contractile ; le rapport systolique est le quotient ( systole ) n / volume . Sa borne supérieure, sur l’ensemble des métriques riemanniennes, est fini pour une large classe de variétés, dont les  K ( π , 1 ) .On étudie le rapport systolique optimal des variétés de Bieberbach compactes, orientables de dimension 3 qui ne sont pas des tores, et on démontre en utilisant des constructions de métriques polyèdrales...

Geometrization of three manifolds and Perelman's proof.

Joan Porti (2008)

RACSAM

This is a survey about Thurston’s geometrization conjecture of three manifolds and Perelman’s proof with the Ricci flow. In particular we review the essential contribution of Hamilton as well as some results in topology relevants for the proof.

Geometrodynamics of some non-relativistic incompressible fluids.

Agostino Pràstaro (1979)

Stochastica

In some previous papers [1, 2] we proposed a geometric formulation of continuum mechanics, where a continuous body is seen as a suitable differentiable fiber bundle C on the Galilean space-time M, beside a differential equation of order k, Ek(C), on C and the assignement of a frame Psi on M. This approach allowed us to treat continuum mechanics as a unitary field theory and to consider constitutive and dynamical properties in a more natural way. Further, the particular intrinsic geometrical framework...

Geometry of compactifications of locally symmetric spaces

Lizhen Ji, Robert Macpherson (2002)

Annales de l’institut Fourier

For a locally symmetric space M , we define a compactification M M ( ) which we call the “geodesic compactification”. It is constructed by adding limit points in M ( ) to certain geodesics in M . The geodesic compactification arises in other contexts. Two general constructions of Gromov for an ideal boundary of a Riemannian manifold give M ( ) for locally symmetric spaces. Moreover, M ( ) has a natural group theoretic construction using the Tits building. The geodesic compactification plays two fundamental roles in...

Geometry of control-affine systems.

Clelland, Jeanne N., Moseley, Christopher G., Wilkens, George R. (2009)

SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]

Geometry of Cyclic and Anticylic Algebras

Igor M. Burlakov, Marek Jukl (2016)

Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

The article deals with spaces the geometry of which is defined by cyclic and anticyclic algebras. Arbitrary multiplicative function is taken as a fundamental form. Motions are given as linear transformation preserving given multiplicative function.

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