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- W3201341567 abstract "Let S be a smooth del Pezzo surface that is defined over a field K and splits over a Galois extension L. Let G be either the split reductive group given by the root system of $S_L$ in Pic $S_L$, or a form of it containing the Neron-Severi torus. Let $mathcal{G}$ be the G-torsor over $S_L$ obtained by extension of structure group from a universal torsor $mathcal{T}$ over $S_L$. We prove that $mathcal{G}$ does not descend to S unless $mathcal{T}$ does. This is in contrast to a result of Friedman and Morgan that such $mathcal{G}$ always descend to singular del Pezzo surfaces over $mathbb{C}$ from their desingularizations." @default.
- W3201341567 created "2021-09-27" @default.
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- W3201341567 date "2021-09-16" @default.
- W3201341567 modified "2023-09-27" @default.
- W3201341567 title "G-torsors and universal torsors over nonsplit del Pezzo surfaces" @default.
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