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Similarly to our papers I and II on the subject (see arXiv:1403.6061 and arXiv:1504.00326), we classify degenerations of codimension 2 and higher of Kahlerian K3 surfaces with finite symplectic automorphism groups. In parts I and II, it was…

Algebraic Geometry · Mathematics 2018-12-21 Viacheslav V. Nikulin

We construct here many families of K3 surfaces that one can obtain as quotients of algebraic surfaces by some subgroups of the rank four complex reflection groups. We find in total 15 families with at worst $ADE$--singularities. In…

Algebraic Geometry · Mathematics 2024-04-17 Cédric Bonnafé , Alessandra Sarti

We calculate the automorphism group of the Kummer surface associated with a curve of genus 2 or the product of two elliptic curves in characteristic two under the assumption that the Kummer surface is a $K3$ surface. Moreover we discuss the…

Algebraic Geometry · Mathematics 2025-12-24 Shigeyuki Kondo , Shigeru Mukai

We construct a lot of K3 surface automorphisms of positive entropy having rotation domains of ranks 1 and 2. To carry out this construction, we first lay theoretical foundations concerning equivariant linearization of nonlinear maps under…

Algebraic Geometry · Mathematics 2025-10-21 Katsunori Iwasaki

Kummer surfaces are special quartic surfaces that admit $16$ nodes. The automorphisms of K3 Kummer surfaces are rich and complicated. Based on the results of Keum and Kond\=o, and as a continuation of the recent result by He and Yang, we…

Algebraic Geometry · Mathematics 2024-01-17 Zhuang He

In this dissertation classification problems for K3-surfaces with finite group actions are considered. Special emphasis is put on K3-surfaces with antisymplectic involutions and compatible actions of symplectic transformations. Given a…

Algebraic Geometry · Mathematics 2009-02-24 Kristina Frantzen

We prove that all nontrivial finite subgroups of derived automorphisms of K3 surfaces of Picard number one have order two and give formulas for the numbers of their conjugacy classes. We also obtain a similar result for the subgroups which…

Algebraic Geometry · Mathematics 2023-05-17 Yu-Wei Fan , Kuan-Wen Lai

We construct a K3 surface over an algebraically closed field of characteristic 2 which contains two sets of 21 disjoint smooth rational curves such that each curve from one set intersects exactly 5 curves from the other set. This…

Algebraic Geometry · Mathematics 2007-05-23 I. Dolgachev , S. Kondo

We prove that there exists a one-to-one correspondence between smooth quartic surfaces with an outer Galois point and K3 surfaces with a certain automorphism of order 4. Furthermore, we characterize quartic surfaces with two or more outer…

Algebraic Geometry · Mathematics 2024-08-09 Kei Miura , Shingo Taki

We determine explicit generators for the ring of modular forms associated with the moduli spaces of K3 surfaces with automorphism group $(\mathbb{Z}/2\mathbb{Z})^2$ and of Picard rank 13 and higher. The K3 surfaces in question carry a…

Algebraic Geometry · Mathematics 2026-01-14 Adrian Clingher , Andreas Malmendier , Brandon Williams

Let X be a K3 surface with an involution g which has non-empty fixed locus X^g and acts non-trivially on a non-zero holomorphic 2-form. We shall construct all such pairs (X, g) in a canonical way, from some better known double coverings of…

Algebraic Geometry · Mathematics 2007-05-23 D. -Q. Zhang

Using the theory of holes of the Leech lattice and Borcherds method for the computation of the automorphism group of a K3 surface, we give an effective bound for the set of isomorphism classes of projective models of fixed degree for…

Algebraic Geometry · Mathematics 2016-07-11 Ichiro Shimada

We compute endomorphism algebras of Kuga-Satake varieties associated to K3 surfaces.

Algebraic Geometry · Mathematics 2012-11-05 Evgeny Mayanskiy

We give a complete classification of finite subgroups of automorphisms of K3 surfaces up to deformation. The classification is in terms of Hodge theoretic data associated to certain conjugacy classes of finite subgroups of the orthogonal…

Algebraic Geometry · Mathematics 2023-03-27 Simon Brandhorst , Tommy Hofmann

The elliptic modular surface of level 4 is a complex K3 surface with Picard number 20. This surface has a model over a number field such that its reduction modulo 3 yields a surface isomorphic to the Fermat quartic surface in characteristic…

Algebraic Geometry · Mathematics 2019-09-12 Ichiro Shimada

This article describes an example of a real projective K3 surface admitting a real automorphism $f$ satisfying $h_{top}(f, X(\mathbb{C})) < 2 h_{top}(f, X(\mathbb{R}))$. The example presented is a $(2,2,2)$-surface in $\mathbb{P}^1 \times…

Dynamical Systems · Mathematics 2025-06-05 Ethan Cohen

We study automorphisms of order four on K3 surfaces. The symplectic ones have been first studied by Nikulin, they are known to fix six points and their action on the K3 lattice is unique. In this paper we give a classification of the purely…

Algebraic Geometry · Mathematics 2015-03-19 Michela Artebani , Alessandra Sarti

The first part of this paper studied $\mathrm{GSp}_4$-type abelian varieties and the corresponding compatible systems of $\mathrm{GSp}_4$ representations. Techniques in \cite{BCGP} are applied to show that one can prove the potential…

Number Theory · Mathematics 2025-12-05 Chao Gu

For a K3 surface of finite height over a field of odd characteristic, there exists a smooth lifting to the ring of Witt vectors such that the reduction map from the Picard group of the generic fiber to the Picard group of the special fiber…

Algebraic Geometry · Mathematics 2015-06-12 Junmyeong Jang

We survey some recent progress in the study of algebraic varieties X with log terminal singularities, especially, the uni-ruledness of the smooth locus X^0 of X, the fundamental group of X^0 and the automorphisms group on (smooth or…

Algebraic Geometry · Mathematics 2018-06-20 J. Keum , D. -Q. Zhang
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