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- Title
Geometric properties of projective manifolds of small degree.
- Authors
KWAK, SIJONG; PARK, JINHYUNG
- Abstract
The aim of this paper is to study geometric properties of non-degenerate smooth projective varieties of small degree from a birational point of view. First, using the positivity property of double point divisors and the adjunction mappings, we classify smooth projective varieties in $\mathbb{P}$r of degree d ⩽ r + 2, and consequently, we show that such varieties are simply connected and rationally connected except in a few cases. This is a generalisation of P. Ionescu's work. We also show the finite generation of Cox rings of smooth projective varieties in $\mathbb{P}$r of degree d ⩽ r with counterexamples for d = r + 1, r + 2. On the other hand, we prove that a non-uniruled smooth projective variety in $\mathbb{P}$r of dimension n and degree d ⩽ n(r − n) + 2 is Calabi–Yau, and give an example that shows this bound is also sharp.
- Subjects
MANIFOLDS (Mathematics); NON-degenerate perturbation theory; VARIETIES (Universal algebra); MATHEMATICAL mappings; GENERALIZATION
- Publication
Mathematical Proceedings of the Cambridge Philosophical Society, 2016, Vol 160, Issue 2, p257
- ISSN
0305-0041
- Publication type
Article
- DOI
10.1017/S0305004115000663