2 papers
math.AG2008
On some Fano--Enriques threefolds
Ilya Karzhemanov
We give a classification of Fano threefolds with canonical Gorenstein singularities such that possess a regular involution, which acts freely on some smooth surface in $|-K…
math.AG2008
Halphen pencils on quartic threefolds
Ivan Cheltsov, Ilya Karzhemanov
For every smooth quartic threefold, we classify all pencils on it whose general element is an irreducible surface birational to a smooth surface of Kodaira dimension zero.