English

A note on the projective varieties of almost general type

Algebraic Geometry 2010-06-29 v5

Abstract

A Q\mathbf{Q}-Cartier divisor DD on a projective variety MM is {\it almost nup}, if (D,C)>0(D , C) > 0 for every very general curve CC on MM. An algebraic variety XX is of {\it almost general type}, if there exists a projective variety MM with only terminal singularities such that the canonical divisor KMK_M is almost nup and such that MM is birationally equivalent to XX. We prove that a complex algebraic variety is of almost general type if and only if it is neither uniruled nor covered by any family of varieties being birationally equivalent to minimal varieties with numerically trivial canonical divisors, under the minimal model conjecture. Furthermore we prove that, for a projective variety XX with only terminal singularities, XX is of almost general type if and only if the canonical divisor KXK_X is almost nup, under the minimal model conjecture.

Keywords

Cite

@article{arxiv.math/0506132,
  title  = {A note on the projective varieties of almost general type},
  author = {Shigetaka Fukuda},
  journal= {arXiv preprint arXiv:math/0506132},
  year   = {2010}
}

Comments

11 pages, LaTeX2e; The published version

R2 v1 2026-07-22T17:20:23.832Z