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math.AG2025
Stein degree on log Calabi-Yau fibrations
Caucher Birkar, Santai Qu
We prove a conjecture proposed by the first author on boundedness of Stein degree of divisors on log Calabi-Yau fibrations. More precisely, for and ,…
math.AG2025
Saturated base change of toroidal morphisms
Santai Qu
We show that saturated base change of a dominant toroidal morphism is also toroidal. For completeness, we give full details on equivalence between definitions regarding toroidal em…
math.AG2025
Stein degree on non-Fano type fibrations
Caucher Birkar, Santai Qu
We construct examples showing that Stein degree of vertical divisors on non-Fano type log Calabi-Yau fibrations is unbounded.