Effective behavior of multiple linear systems

Details Effective behavior of multiple linear systems Effective behavior of multiple linear systems

2003-12-03

arxiv.org/abs/math/0312078v1

Mathematics

Algebraic Geometry

Latex, 17 pages. Asian Journal of Mathematics (to appear)

Scientific paper

We give optimal effective bounds for some well-known theorems on complex algebraic surfaces, which are respectively due to Serre, Zariski (1962), Castelnuovo (1897), Artin (1962, 1966), Benveniste (1984), Cutkosky and Srinivas (1993). These theorems are about Riemann-Roch problem (on the behavior of the function dim |nD| of n), vanishing theorems, base-point freeness and k-very ampleness of the linear systems |nD| and |nA+L|, where D is effective, A is nef and big and L is arbitrary. As a consequence, we obtain an effective version of Matsusaka's big theorem, and we give also examples to show that our bound is the best possible one.

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