Výsledky vyhledávání - "Hassanzadeh, Seyed Hamid"

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A genus explanation of the Buchsbaum-Rim multiplicity

Autor: Bouça, Vinicius, Fiel, Thiago, Hassanzadeh, Seyed Hamid, Naéliton, José

We study the Buchsbaum-Rim multiplicity, ab inicio, through a Koszul-\v{C}ech spectral sequence. We show that the Buchsbaum-Rim multiplicity is the arithmetic genus (Euler characteristic) of Koszul homology sheaves on a projective space over the base

Externí odkaz: http://arxiv.org/abs/2104.09698

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Residual Intersections are Koszul-Fitting ideals

Autor: Bouça, Vinicius, Hassanzadeh, Seyed Hamid

Publikováno v: Compositio Math. 155 (2019) 2150-2179

One describes generators of disguised residual intersections in any commutative Noetherian rings. It is shown that, over Cohen-Macaulay rings, the disguised residual intersections and algebraic residual intersections are the same, for ideals with sli

Externí odkaz: http://arxiv.org/abs/1810.05134

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Effective criteria for bigraded birational maps

Autor: Botbol, Nicolás, Busé, Laurent, Chardin, Marc, Hassanzadeh, Seyed Hamid, Simis, Aron, Tran, Quang Hoa

In this paper, we consider rational maps whose source is a product of two subvarieties, each one being embedded in a projective space. Our main objective is to investigate birationality criteria for such maps. First, a general criterion is given in t

Externí odkaz: http://arxiv.org/abs/1602.07490

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Implicitization of de Jonqui\`eres parametrizations

Autor: Hassanzadeh, Seyed Hamid, Simis, Aron

One introduces a class of projective parameterizations that resemble generalized de Jonqui\`eres maps. Any such parametrization defines a birational map $\mathfrak{F}$ of $\pp^n$ onto a hypersurface $V(F)\subset \pp^{n+1}$ with a strong handle to imp

Externí odkaz: http://arxiv.org/abs/1205.1083

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Cohen-Macaulay residual intersections and their Castelnuovo-Mumford Regularity

Autor: Hassanzadeh, Seyed Hamid

In this article we study the structure of residual intersections via constructing a finite complex which is acyclic under some sliding depth conditions on the cycles of the Koszul complex. This complex provides information on an ideal which coincides

Externí odkaz: http://arxiv.org/abs/0905.4901

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