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math.AG2026
Plane Cremona maps preserving a Euclidean volume form
Marc Abboud, Jérémy Blanc, Stéphane Lamy
We give a presentation by generators and relations of the group of birational transformations of the plane preserving a differential form with poles along a triple line. This group…
math.AG2026
Tame polynomial automorphisms
Stéphane Lamy
The group of polynomial automorphisms of the affine n-space is an interesting large group. A slightly simpler group is its subgroup of tame automorphisms. Natural problems about th…