I am currently studying bigness of divisors, and its relationship between its numerical class and Kodaira dimension (using the aide of Lazarsfeld's Positivity in Algebraic Geometry I). I understand that if $D$ is numerically trivial, then its Kodaira dimension, $kod(D)$, is either $-\infty$ or $0$, and in particular, $Kod(D)=0 \Longleftrightarrow [D]$ is a torsion line bundle. Can someone please explain to me what exactly makes a line bundle torsion?
2026-04-01 15:58:53.1775059133
What exactly is a torsion line bundle?
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