Erratum to "On the 2 and the 3-Connectedness of ample divisors on a surface".
Antonio Lanteri, Mauro Beltrametti (1987)
Manuscripta mathematica
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Displaying similar documents to “On the 2 and the 3-connectedness of ample divisors on a surface.”
Erratum to "On the 2 and the 3-Connectedness of ample divisors on a surface".
A two-sides omega-theorem for an asymmetric divisor problem.
Werner Georg Nowak (1990)
Manuscripta mathematica
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The adjunction mapping and hyperelliptic divisors on a surface.
Fernando Serrano (1987)
Journal für die reine und angewandte Mathematik
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On the adjoint system to a very ample divisor on a surface and connected inequalities
Antonio Lanteri, Marino Palleschi (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Si caratterizzano alcune classi di superfici in relazione all’indice di autointersezione dell'aggiunto ad un divisore molto ampio.
Ample divisors on the blow up of P3 at points.
Falvio Angelini (1997)
Manuscripta mathematica
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On connected divisors.
Alzati, Alberto, Tortora, Alfonso (2002)
Advances in Geometry
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On fluctuations in the mean of a sum-of-divisors function
Y.-F. S. Pétermann (2004)
Acta Arithmetica
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Extension of Morphisms Defined on a Divisor.
Fernando Serrano (1987)
Mathematische Annalen
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Cesàro means related to the square of the divisor function
Gintautas Bareikis, Algirdas Mačiulis (2012)
Acta Arithmetica
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Arithmetically Gorenstein curves on arithmetically Cohen-Macaulay surfaces.
Alberto Dolcetti (2002)
Collectanea Mathematica
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Let Sigma C PN be a smooth connected arithmetically Cohen-Macaulay surface. Then there are at most finitely many complete linear systems on Sigma, not of the type |kH - K| (H hyperplane section and K canonical divisor on Sigma), containing arithmetically Gorenstein curves.
On the fixed part of certain linear systems on surfaces
Xavier Benveniste (1984)
Compositio Mathematica
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On the adjoint system to a very ample divisor on a surface and connected inequalities. Nota II
Antonio Lanteri, Marino Palleschi (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Si caratterizzano alcune classi di superfici in relazione all’indice di autointersezione dell'aggiunto ad un divisore molto ampio.
The range of the sum-of-proper-divisors function
Florian Luca, Carl Pomerance (2015)
Acta Arithmetica
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Answering a question of Erdős, we show that a positive proportion of even numbers are in the form s(n), where s(n) = σ(n) - n, the sum of proper divisors of n.
Triangular numbers whose sum of divisors is also triangular
Douglas E. Iannucci, Florian Luca (2007)
Acta Arithmetica
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On the average of the sum-of-a-divisors function
Shi-Chao Chen, Yong-Gao Chen (2004)
Colloquium Mathematicae
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We prove an Ω result on the average of the sum of the divisors of n which are relatively coprime to any given integer a. This generalizes the earlier result for a prime proved by Adhikari, Coppola and Mukhopadhyay.
On ramifications divisors of functions in a punctured compact Riemann surface.
Pascual Cutillas Ripoll (1989)
Publicacions Matemàtiques
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Let ν be a compact Riemann surface and ν' be the complement in ν of a nonvoid finite subset. Let M(ν') be the field of meromorphic functions in ν'. In this paper we study the ramification divisors of the functions in M(ν') which have exponential singularities of finite degree at the points of ν-ν', and one proves, for instance, that if a function in M(ν') belongs to the subfield generated by the functions of this type, and has a finite ramification divisor, it also has a finite divisor....