Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Mustapha Lahyane"'
Publikováno v:
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, Vol 101, Iss 2, p LC1 (2023)
We use Bott's residue formula to infer that a general cubic surface in the projective space P^3_C contains exactly twenty seven lines and that a general complete intersection of two quadrics in P^4_C contains exactly sixteen lines.
Externí odkaz:
https://doaj.org/article/d8b7e5ce2148413bb65d44997c04d1e5
Publikováno v:
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, Vol 95, Iss 1, p S1 (2017)
In this expository article we give a self-contained presentation on the rational points of finite order on smooth cubics. We mainly construct examples of points of order between four and twelve, except the eleven case of course. And, in some cases, w
Externí odkaz:
https://doaj.org/article/3938100452064d0bac422dbdfca13a0e
Autor:
Mustapha Lahyane
Publikováno v:
International Journal of Mathematics and Mathematical Sciences, Vol 31, Iss 2, Pp 123-126 (2002)
We give an optimal bound for the number of (−1)-curves on an extremal rational surface X under the assumption that −KX is numerically effective and having self-intersection zero. We also prove that a nonelliptic extremal rational surface has at m
Externí odkaz:
https://doaj.org/article/c4a53771db2a4ff288b7719174bd3f2b
Publikováno v:
Canadian Mathematical Bulletin. :1-15
This paper is devoted to determine the geometry of a class of smooth projective rational surfaces whose minimal models are the Hirzebruch ones; concretely, they are obtained as the blowup of a Hirzebruch surface at collinear points. Explicit descript
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59546e9ff15bd4988b754ecc8124069e
https://doi.org/10.4153/s0008439523000255
https://doi.org/10.4153/s0008439523000255
Publikováno v:
Rendiconti del Circolo Matematico di Palermo Series 2. 70:167-197
The aim of this work is to present the classification of the surfaces obtained as blow-up of a Hirzebruch surface at points in general position according to the finiteness of their effective monoids and to determine explicitly their minimal generatin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bce62c1212b1d3343701d96c1f073177
https://doi.org/10.1007/s12215-020-00489-3
https://doi.org/10.1007/s12215-020-00489-3
Publikováno v:
Mediterranean Journal of Mathematics. 17
The aim of this work was to study the finite generation of the effective monoid and Cox ring of a Platonic Harbourne-Hirschowitz rational surface with an anticanonical divisor not reduced which contains some exceptional curves as irreducible componen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b96c3a3151adf11ef157d372e7c277b
https://doi.org/10.1007/s00009-020-01593-5
https://doi.org/10.1007/s00009-020-01593-5
Publikováno v:
Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas. 111:297-306
In this paper, we provide new families of smooth projective rational surfaces whose Cox rings are finitely generated. These surfaces are constructed by blowing-up points in Hirzebruch surfaces and may have very high Picard numbers. Such construction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83224d4c2d1d3ffad3f85661db4a77b6
https://doi.org/10.1007/s13398-016-0296-0
https://doi.org/10.1007/s13398-016-0296-0
Autor:
Brenda Leticia De La Rosa-Navarro, Gioia, Failla, Juan Bosco Fr´ıas-Medina, Mustapha, Lahyane, Utano, Rosanna
Publikováno v:
Singularities, Algebraic Geometry, Commutative Algebra, and Related Topics ISBN: 9783319968261
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6456226179a65f68f07a91affd540e79
https://doi.org/10.1007/978-3-319-96827-8_12
https://doi.org/10.1007/978-3-319-96827-8_12
Autor:
Juan Bosco Frías Medina, Israel Moreno Mejía, Brenda Leticia De La Rosa Navarro, Mustapha Lahyane, Osvaldo Osuna Castro
Publikováno v:
Revista Matemática Iberoamericana. 31:1131-1140
The aim of this paper is to give a geometric characterization of the finite generation of the Cox rings of anticanonical rational surfaces. This characterization is encoded in the finite generation of the effective monoid. Furthermore, we prove that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bfdf7fbed6efa1ce622bb95a7f12c83
https://doi.org/10.4171/rmi/878
https://doi.org/10.4171/rmi/878
Publikováno v:
Algebra for Secure and Reliable Communication Modeling. :159-171
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4744b786408cbccd9d1109b350b17e41
https://doi.org/10.1090/conm/642/12884
https://doi.org/10.1090/conm/642/12884