15 citations · 54 across the 13 of their papers we have counts for
13 papers
Finite symplectic automorphism groups of supersingular K3 surfaces
Hisanori Ohashi, Matthias Schütt
We give a complete classification of finite groups acting symplectically on supersingular K3 surfaces of Artin invariant one. Using work of Dolgachev and Keum, this provides the fu…
On automorphisms of Enriques surfaces and their entropy
Yuya Matsumoto, Hisanori Ohashi, Sławomir Rams
Consider an arbitrary automorphism of an Enriques surface with its lift to the covering K3 surface. We prove a bound of the order of the lift acting on the anti-invariant cohomolog…
The automorphism groups of Enriques surfaces covered by symmetric quartic surfaces
Shigeru Mukai, Hisanori Ohashi
Let be the (minimal) Enriques surface obtained from the symmetric quartic surface in with , by taking quotient…
Bi-canonical representations of finite automorphisms acting on Enriques surfaces
Hisanori Ohashi
We classify the bi-canonical representations of finite automorphisms on Enriques surfaces. There are three types of non-trivial cases and examples are given explicitly by Horikawa…
Gorenstein -homology projective planes
DongSeon Hwang, JongHae Keum, Hisanori Ohashi
We present the complete list of all singularity types on Gorenstein -homology projective planes, i.e., normal projective surfaces of second Betti number one with at wor…
Finite groups of automorphisms of Enriques surfaces and the Mathieu group
Shigeru Mukai, Hisanori Ohashi
An action of a group on an Enriques surface is called Mathieu if it acts on trivially and every element of order 2, 4 has Lefschetz number 4. A finite group …