Structures on manifolds | Birational geometry | Algebraic geometry

Canonical ring

In mathematics, the pluricanonical ring of an algebraic variety V (which is non-singular), or of a complex manifold, is the graded ring of sections of powers of the canonical bundle K. Its nth graded component (for ) is: that is, the space of sections of the n-th tensor product Kn of the canonical bundle K. The 0th graded component is sections of the trivial bundle, and is one-dimensional as V is projective. The projective variety defined by this graded ring is called the canonical model of V, and the dimension of the canonical model is called the Kodaira dimension of V. One can define an analogous ring for any line bundle L over V; the analogous dimension is called the Iitaka dimension. A line bundle is called big if the Iitaka dimension equals the dimension of the variety. (Wikipedia).

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Related pages

Birational invariant | Linear system of divisors | Iitaka dimension | Finitely generated algebra | Mathematics | Line bundle | Tensor product | Kodaira dimension | Canonical bundle | Section (fiber bundle) | Algebraic variety | Complex manifold