Mathematics – Algebraic Geometry
Scientific paper
2008-09-17
Mathematics
Algebraic Geometry
26 pages
Scientific paper
We refine the notion of variety over the "field with one element" developed by C. Soul\'e by introducing a grading in the associated functor to the category of sets, and show that this notion becomes compatible with the geometric viewpoint developed by J. Tits. We then solve an open question of C. Soul\'e by proving, using results of J. Tits and C. Chevalley, that Chevalley group schemes are examples of varieties over a quadratic extension of the above "field".
Connes Alain
Consani Caterina
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