![Strong primeness for equivalence relations arising from Zariski dense subgroups](/media/cache/video_light/uploads/video/Capture%20d%E2%80%99%C3%A9cran%202024-06-14%20%C3%A0%2010.01.07.png)
![](/assets/front/img/icon-video-play-7e3956a0b9.png)
Strong primeness for equivalence relations arising from Zariski dense subgroups
De Cyril Houdayer
![Non tame cocycle rigidity above affine unipotent abelian actions on the torus](/media/cache/video_light/uploads/video/Capture%20d%E2%80%99%C3%A9cran%202024-06-13%20%C3%A0%2010.09.15.png)
![](/assets/front/img/icon-video-play-7e3956a0b9.png)
Non tame cocycle rigidity above affine unipotent abelian actions on the torus
De Bassam Fayad
Apparaît dans la collection : 1923-2023, Centenaire de René Thom
One of the simplest problems of normalization concerns analytic local diffeomorphisms of the plane in the neighborhood of a weakly attracting elliptic fixed point at which the derivative is a non-periodic rotation. Defining "geometric normalization" as an analytic local change of coordinates which transforms the local diffeomorphism into one leaving invariant the foliation by circles centered at the fixed point, I shall describe works with David Sauzin, Shanzhong Sun and Qiaoling Wei which address the existence of normalizations and geometric normalizations.