Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Jarosław A. Wiśniewski"'
Publikováno v:
SIAM Journal on Applied Algebra and Geometry. 5:60-85
We study the maximum likelihood (ML) degree of linear concentration models in algebraic statistics. We relate it to an intersection problem on the variety of complete quadrics. This allows us to pr...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c600db2a5f1a4649e990965e34509540
https://doi.org/10.1137/20m1335960
https://doi.org/10.1137/20m1335960
Publikováno v:
Transformation Groups. 27:1431-1473
Let X be a complex projective manifold, L an ample line bundle on X, and assume that we have a ℂ* action on (X;L). We classify such triples (X; L;ℂ*) for which the closure of a general orbit of the ℂ* action is of degree ≤ 3 with respect to L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aad1f9956ef026771ffde997dd9be6f0
https://doi.org/10.1007/s00031-020-09627-8
https://doi.org/10.1007/s00031-020-09627-8
We link small modifications of projective varieties with a ${\mathbb C}^*$-action to their GIT quotients. Namely, using flips with centers in closures of Bia{\l}ynicki-Birula cells, we produce a system of birational equivariant modifications of the o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1217a0ae9681c85aa4136605944095a1
http://arxiv.org/abs/2103.07209
http://arxiv.org/abs/2103.07209
Publikováno v:
Selecta Mathematica. 27
We prove LeBrun--Salamon conjecture in the following situation: if $X$ is a contact Fano manifold of dimension $2n+1$ whose group of automorphisms is reductive of rank $\geq \max(2,(n-3)/2)$ then $X$ is the adjoint variety of a simple group. The rank
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bc70a52a2a1cb85f75a783135764231
https://doi.org/10.1007/s00029-021-00621-w
https://doi.org/10.1007/s00029-021-00621-w
Autor:
Jarosław A. Wiśniewski, Andrzej Weber
Publikováno v:
International Mathematics Research Notices. 2018:2967-2979
We prove that the variety of complete flags for any semisimple algebraic group is rigid in any smooth family of Fano manifolds.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5e615362fdfa8cc0cd139519553a5c8
https://doi.org/10.1093/imrn/rnw334
https://doi.org/10.1093/imrn/rnw334
Publikováno v:
Le Matematiche, Vol 66, Iss 2, Pp 113-114 (2011)
The twelfth edition of the PRAGMATIC Summer School took place in Catania between August 30 – September 17, 2010. The lecturers were Prof. Paltin Ionescu (University of Bucharest) and Prof. Jarosław Antoni Wiśniewski (University of Warsaw), assist
Externí odkaz:
https://doaj.org/article/a65b78da6cfe41ada5f54a910002b045
We prove the LeBrun-Salamon Conjecture in low dimensions. More precisely, we show that a contact Fano manifold X of dimension 2n+1 that has reductive automorphism group of rank at least n-2 is necessarily homogeneous. This implies that any positive q
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7691121d5c4758133d6a0202da92a145
http://arxiv.org/abs/1802.05002
http://arxiv.org/abs/1802.05002
Autor:
Michal Kapustka, Grzegorz Kapustka, Bert van Geemen, Maria Donten-Bury, Jarosław A. Wiśniewski
Publikováno v:
Geom. Topol. 21, no. 2 (2017), 1179-1230
We show that the Hilbert scheme of two points on the Vinberg $K3$ surface has a 2:1 map onto a very symmetric EPW sextic $Y$ in $\mathbb{P}^5$. The fourfold $Y$ is singular along $60$ planes, $20$ of which form a complete family of incident planes. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e0f50d1927e2213a2b609dd58aab136
http://ruj.uj.edu.pl/xmlui/handle/item/39717
http://ruj.uj.edu.pl/xmlui/handle/item/39717
As an application of a recent characterization of complete flag manifolds as Fano manifolds having only ${\mathbb P}^1$-bundles as elementary contractions, we consider here the case of a Fano manifold $X$ of Picard number one supporting an unsplit fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40b96e458dbe98e4abaa37623ce5f36b
http://hdl.handle.net/11572/142979
http://hdl.handle.net/11572/142979
Publikováno v:
Revista Matemática Complutense. 23:191-215
We discuss a generalization of Kummer construction which, on the base of an integral representation of a finite group and local resolution of its quotient, produces a higher dimensional variety with trivial canonical class. As an application we compu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f77ad65d78b4b6fd2036ffd268d02d1
https://doi.org/10.1007/s13163-009-0010-2
https://doi.org/10.1007/s13163-009-0010-2