2020
DOI: 10.5802/crmath.86
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Very special algebraic groups

Abstract: We say that a smooth algebraic group G over a field k is very special if for any field extension K /k, every G K-homogeneous K-variety has a K-rational point. It is known that every split solvable linear algebraic group is very special. In this note, we show that the converse holds, and discuss its relationship with the birational classification of algebraic group actions. Résumé. Nous disons qu'un groupe algébrique lisse G sur un corps k est très spécial si pour toute extension de corps K /k, toute K-variété … Show more

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