2023
DOI: 10.5802/jep.217
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Rigid birational involutions of 3 and cubic threefolds

Abstract: We construct families of birational involutions on P 3 or on a smooth cubic threefold which do not fit into a non-trivial elementary relation of Sarkisov links. As a consequence, we construct new homomorphisms from their group of birational transformations, effectively re-proving their non-simplicity. We also prove that these groups admit a free product structure. Finally, we produce automorphisms of these groups that are not generated by inner and field automorphisms.Résumé (Involutions birationnelles rigides… Show more

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