Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Uwe Nagel"'
Publikováno v:
Le Matematiche, Vol 55, Iss 2, Pp 483-498 (2000)
We describe the even Gorenstein liaison classes of ropes supported on a line which are not arithmetically Buchsbaum.
Externí odkaz:
https://doaj.org/article/9275a6b3ceea4299b9a15ce195aba3bd
Autor:
Uwe Nagel
Publikováno v:
Le Matematiche, Vol 55, Iss 2, Pp 339-351 (2000)
We discuss recent results on the possible pairs of degree and genus of projective curves and on the related problem of bounding the cohomology of curves.
Externí odkaz:
https://doaj.org/article/3e67b360e1464bbabf44f6f8936e5904
Autor:
Ulrik Brandes, Jürgen Lerner, Miranda J. Lubbers, Christopher McCarthy, José Luis Molina, Uwe Nagel
Publikováno v:
Journal of Social Structure, Vol 11, Iss 1 (2010)
Externí odkaz:
https://doaj.org/article/d67edf0f257f4ffc9a823a00d6a6298c
Autor:
Uwe Nagel
Publikováno v:
Le Matematiche, Vol 46, Iss 2, Pp 547-558 (1991)
A relation between Hilbert functions of linked ideals is established and discussed in various examples. Then it is applied to compute the degree of the intersection of two projective schemes in a special situation.
Externí odkaz:
https://doaj.org/article/cf04b868f84e4832a7ef8002ec3efb1c
Autor:
Aida Maraj, Uwe Nagel
Publikováno v:
Journal of Algebra. 631:236-266
Motivated by results on the rationality of equivariant Hilbert series of some hierarchical models in algebraic statistics we introduce the Segre product of formal languages and apply it to establish rationality of equivariant Hilbert series in new ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21370f7c3b7bd4085da44540e05dbb1b
https://doi.org/10.1016/j.jalgebra.2023.04.016
https://doi.org/10.1016/j.jalgebra.2023.04.016
Autor:
Alexandra Seceleanu, Uwe Nagel, Hernán de Alba, Federico Galetto, Satoshi Murai, Augustine O'Keefe, Tim Römer, Jennifer Biermann
Publikováno v:
Journal of Algebra. 560:312-342
We introduce a new class of monomial ideals which we call symmetric shifted ideals. Symmetric shifted ideals are fixed by the natural action of the symmetric group and, within the class of monomial ideals fixed by this action, they can be considered
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff34ca6e54f796d4d6fcbf75f8de5a96
https://doi.org/10.1016/j.jalgebra.2020.04.037
https://doi.org/10.1016/j.jalgebra.2020.04.037
Publikováno v:
International Mathematics Research Notices. 2022:140-170
We introduce the use of liaison addition to the study of hyperplane arrangements. For an arrangement, $\mathcal A$, of hyperplanes in $\mathbb P^n$, $\mathcal A$ is free if $R/J$ is Cohen-Macaulay, where $J$ is the Jacobian ideal of $\mathcal A$. Ter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2555fea6ea895ce458504c9b9fe42e58
https://doi.org/10.1093/imrn/rnaa113
https://doi.org/10.1093/imrn/rnaa113
Autor:
David Cook, Uwe Nagel
Publikováno v:
Journal of Commutative Algebra. 13
Deciding the presence of the weak Lefschetz property often is a challenging problem. Continuing studies of Brenner and Kaid (2007), Cook II and Nagel (2011) and Migliore, Miro-Roig, Murai and Nagel (2013) we carry out an in-depth study of Artinian mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21393bf1d118e676dae22526a14c6f92
https://doi.org/10.1216/jca.2021.13.157
https://doi.org/10.1216/jca.2021.13.157
Autor:
Anthony V. Geramita, Uwe Nagel, Brian Harbourne, Juan C. Migliore, Yong-Su Shin, Maria Virginia Catalisano, Alessandro Gimigliano
Publikováno v:
Journal of Algebra. 528:381-438
Given the space V = P ( d+n 1 n 1 ) 1 of forms of degree d in n variables, and given an integer l > 1 and a partition λ of d = d1 + ··· + dr, it is in general an open problem to obtain the dimensions of the l-secant varieties σl(Xn 1,λ) for the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f5e6ea13a44ede70dc68d115ddb24b2
https://doi.org/10.1016/j.jalgebra.2019.03.014
https://doi.org/10.1016/j.jalgebra.2019.03.014
Publikováno v:
Journal of Pure and Applied Algebra. 223:1456-1471
Mustaţa has given a conjecture for the graded Betti numbers in the minimal free resolution of the ideal of a general set of points on an irreducible projective algebraic variety. For surfaces in P 3 this conjecture has been proven for points on quad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bff2ff529a9bca0a29849ea9387f217
https://doi.org/10.1016/j.jpaa.2018.06.014
https://doi.org/10.1016/j.jpaa.2018.06.014