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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
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…