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math.AG2020★ 5 cited
On asymptotic base loci of relative anti-canonical divisors of algebraic fiber spaces
Sho Ejiri, Masataka Iwai, Shin-ichi Matsumura
In this paper, we study the relative anti-canonical divisor of an algebraic fiber space , and we reveal relations among positivity conditions of ,…
math.AG2020★ 1 cited
Subadditivity of Kodaira dimension does not hold in positive characteristic
Paolo Cascini, Sho Ejiri, János Kollár +1
Over any algebraically closed field of positive characteristic, we construct examples of fibrations violating subadditivity of Kodaira dimension.