Abstract
We prove that any principal bundle on the affine line over a perfect field with a reductive group as structure group comes from the base field by base change.
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Raghunathan, M.S., Ramanathan, A. Principal bundles on the affine line. Proc. Indian Acad. Sci. (Math. Sci.) 93, 137–145 (1984). https://doi.org/10.1007/BF02840656
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DOI: https://doi.org/10.1007/BF02840656