Conic bundles that are not birational to numerical Calabi--Yau pairs
Let $X$ be a general conic bundle over the projective plane with branch curve of degree at least 19. We prove that there is no normal projective variety $Y$ that is birational to $X$ and such that some multiple of its anticanonical divisor is effective. We also give such examples for 2-dimensional c...
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| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Association Epiga
2017-09-01
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| Серія: | Épijournal de Géométrie Algébrique |
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| Онлайн доступ: | https://epiga.episciences.org/1518/pdf |