2-Cycles sur les hypersurfaces cubiques de dimension 5

Torsion des courbes elliptiques sur les corps cubiques

We give the list (up to one element) of prime numbers wich are the order of some torsion point of an elliptic curve over a number field of degree 3.

Zéro-cycles de degré un sur les espaces homogènes

We explain how to build homogeneous spaces of a connected linear algebraic group, having zero-cycles of degree one but no rational point, even on a smooth compactification. Thus, we give a negative answer to a recent question asked by Burt Totaro. Parimala ([Pa]) has independently produced such spaces over fields of the type k((t)) (for k a suitable p-adic field), which are projective varieties...

Sur les rétractes absolus Pn-valués de dimension finie

We prove that a k-dimensional hereditarily indecomposable metrisable continuum is not a Pk-valued absolute retract. We deduce from this that none of the classical characterizations of ANR (metric) extends to the class of stratifiable spaces.

Etat actuel de nos connaissances sur les argasidés de l'Iran

Impact de la durée d’enneigement sur les cycles biogéochimiques dans les écosystèmes alpins

_____________________________________________________________________________ 79 Introduction___________________________________________________________________________ 80 Materials and methods __________________________________________________________________ 82 Results_______________________________________________________________________________ 87 Discussion_________________________________...