Automorphism groups of non-normal affine toric surfaces

2026/06/12 by Kirill Selin
Mathematics · #math.AG

paper · pdf

Abstract

We investigate the automorphism group of a non-normal affine toric surface. It is known that for a normal affine toric surface the connected component of the automorphism group is generated by the acting torus and root subgroups. While this fact is also true for some classes of non-normal affine toric surfaces, it fails in general. We give an example of a non-normal affine toric surface, whose singular locus is a point and the connected component of the automorphism group is not generated by the acting torus and root subgroups.

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