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- W4384652257 abstract "We establish a connection between the theory of Ulrich sheaves and $mathbb{A}^1$-homotopy theory. For instance, we prove that the $mathbb{A}^1$-degree of a morphism between projective varieties, that is relatively oriented by an Ulrich sheaf, is constant on the target even when it is not $mathbb{A}^1$-connected. Further if an embedded projective variety is the support of a symmetric Ulrich sheaf of rank one, the $mathbb{A}^1$-degree of all its linear projections can be read off in an explicit way from the free resolution of the Ulrich sheaf. Finally, we construct an Ulrich sheaf on the secant variety of a curve and use this to define an arithmetic version of Viro's encomplexed writhe for curves in $mathbb{P}^3$. This can be considered to be an arithmetic analogue of a link invariant." @default.
- W4384652257 created "2023-07-19" @default.
- W4384652257 creator A5047589315 @default.
- W4384652257 creator A5052155634 @default.
- W4384652257 date "2023-07-14" @default.
- W4384652257 modified "2023-10-18" @default.
- W4384652257 title "Secant varieties of curves, Ulrich bundles and the arithmetic writhe" @default.
- W4384652257 doi "https://doi.org/10.48550/arxiv.2307.07543" @default.
- W4384652257 hasPublicationYear "2023" @default.
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