Compactification of Reductive Group Schemes

arXiv:2601.22462v2 Announce Type: replace Abstract: Let $\mathrm G$ be an isotrivial reductive group over a scheme $S$. We construct a smooth projective $S$-scheme containing $\mathrm G$ as a fiberwise-dense open subscheme equipped with left and right actions of $\mathrm G$ wh...

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