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Journals and Conferences
Virulent strains of the coccidian parasiteToxoplasma gondii become attenuated so as to survive and complete their life cycle; however, it is not known whether the attenuation process is attributable to an innate cystogenic capacity of the parasite or to host-induced mechanisms. This report presents direct evidence of RH cystogenesis in non-immunised Fischer… (More)
We describe smooth projective horospherical varieties with Picard number 1. Moreover we prove that the automorphism group of any such variety acts with at most two orbits and we give a geometric characterisation of non-homogeneous ones.
Let G ⊂ Ĝ be two complex connected reductive groups. We deals with the hard problem of finding sub-G-modules of a given irreducible Ĝ-module. In the case where G is diagonally embedded in Ĝ = G × G, S. Kumar and O. Mathieu found some of them, proving the PRV conjecture. Recently, the authors generalized the PRV conjecture on the one hand to the case where… (More)
We prove a conjecture of L. Bonavero, C. Casagrande, O. Debarre and S. Druel, on the pseudo-index of smooth Fano varieties, in the special case of horospherical varieties. Mathematics Subject Classification. 14J45 14L30 52B20
For a G-variety X with an open orbit, we define its boundary ∂X as the complement of the open orbit. The action sheaf SX is the subsheaf of the tangent sheaf made of vector fields tangent to ∂X. We prove, for a large family of smooth spherical varieties, the vanishing of the cohomology groups Hi(X,SX) for i > 0, extending results of F. Bien and M. Brion… (More)
Bott-Samelson varieties were originally defined as desingularizations of Schubert varieties and were used to describe the geometry of Schubert varieties. In particular, the cohomology of some line bundles on Bott-Samelson varieties were used to prove that Schubert varieties are normal, Cohen-Macaulay and with rational singularities (see for example [BK05]).… (More)
The authors report a case of urinary calculi secondary to glafenine which posed a difficult problem in the radiological diagnosis. They review the literature of iatrogenic urinary calculi and discuss the place of radiology (Excretory Urography, Ultrasound and Computed Tomography) in the diagnosis.
We classify all smooth projective horospherical varieties with Picard number 1. We prove that the automorphism group of any such variety X acts with at most two orbits and that this group still acts with only two orbits on X blown up at the closed orbit. We characterize all smooth projective two-orbits varieties with Picard number 1 that satisfy this latter… (More)
For a few pairs (G ⊂ Ĝ) of reductive groups, we study the decomposition of irreducible Ĝ-modules into G-modules. In particular, we observe the saturation property for all of these pairs.