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math.AG2019
Continuous automorphisms of Cremona groups
Christian Urech, Susanna Zimmermann
We show that if a group automorphism of a Cremona group of arbitrary rank is also a homeomorphism with respect to either the Zariski or the Euclidean topology, then it is inner up…
math.AG2019★ 3 cited
On the characterization of Danielewski surfaces by their automorphism group
Alvaro Liendo, Andriy Regeta, Christian Urech
In this note we show that if the automorphism group of a normal affine surface is isomorphic to the automorphism group of a Danielewski surface, then is isomorphic to a Dan…