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math.AG2012
Real reductive Cayley groups of rank 1 and 2
Mikhail Borovoi, Igor Dolgachev
A linear algebraic group G is over a field K is called a Cayley K-group if it admits a Cayley map, i.e., a G-equivariant K-birational isomorphism between the group variety G and it…
math.AG2012
Numerical trivial automorphisms of Enriques surfaces in arbitrary characteristic
Igor V. Dolgachev
We extend to arbitrary characteristic some known results about automorphisms of complex Enriques surfaces that act trivially on the cohomology or the cohomology modulo torsion.