On global generation of adjoint linear systems (Q1298145)

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scientific article; zbMATH DE number 1336991
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English
On global generation of adjoint linear systems
scientific article; zbMATH DE number 1336991

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    On global generation of adjoint linear systems (English)
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    14 September 1999
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    Let \(L\) be an ample divisor on a smooth projective variety \(X\) of dimension \(n\) and let \(K_X\) be the canonical divisor on \(X\). The author proved in an earlier paper [\textit{S. Helmke}, Duke Math. J. 88, No. 2, 201-216 (1997; Zbl 0876.14004)], that the line bundle \({\mathcal O}_X (K_X+L)\) has a section which is nonvanishing at some \(x\in X\), if \(L^n>n^n\) and \(L^d\). \(Z\geq m_x(Z) n^d\) for all subvarieties \(Z\subset X\) of dimension \(d\) with multiplicity \(m_x(Z) \leq{n-1 \choose d-1}\) at \(x\). Fujita's conjecture says, that the conclusion of this statement still holds without the factor \(m_x(Z)\) in the assumption. In this paper it is shown, that one can omit the factor \(m_x(Z)\) at least for hypersurfaces \(Z\).
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    ample divisor
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    line bundle
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    hypersurfaces
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