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math.AG2026
Cylindricity of log del Pezzo surfaces in characteristic five
Dae-Won Lee, Masaru Nagaoka, Masatomo Sawahara
Over an algebraically closed field of characteristic five, we prove that a log del Pezzo surface of Picard rank one contains no cylinder if it is not log liftable. We also characte…
math.AG2026
Mori dream fibers and the geometric generic fiber
Dae-Won Lee, Masaru Nagaoka
We construct a smooth projective family of rational surfaces over . The Mori dream property of a fiber is determined by the torsion of the normal bundle…