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254 papers · 1 filter
Fano threefolds
Yuri Prokhorov
The goal of these lecture notes is to present the modern point of view on the classification of Fano threefolds. We tried to offer a self-consistent treatment of the topics covered…
Sigma function associated with a hyperelliptic curve with two points at infinity
Takanori Ayano, Victor M. Buchstaber
Baker constructed basic meromorphic functions on the Jacobian variety of a hyperelliptic curve with two points at infinity. We call them Baker functions. The construction is based…
On p-Jordan constant of Cremona group of rank 2 in odd characteristic
Yifei Chen, Constantin Shramov
We bound the indices of normal abelian subgroups in finite groups contained in the Cremona group of rank 2 over a field of odd characteristic.
Automorphisms of del Pezzo surfaces without points
Constantin Shramov, Anastasia Vikulova
We study automorphism groups of del Pezzo surfaces without points over a field of zero characteristic, and estimate their Jordan constants.
On the birational geometry of -Fano threefolds of large Fano index, II
Yuri Prokhorov
This paper is a sequel to [arXiv:2403.18389]. We investigate the rationality problem for -Fano threefolds of Fano index .
G-coregularity of del Pezzo surfaces
Konstantin Loginov, Victor Przyjalkowski, Andrey Trepalin
We introduce and study the notion of -coregularity of algebraic varieties endowed with an action of a finite group . We compute -coregularity of smooth del Pezzo surfaces…