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pro vyhledávání: '"Krähmer A"'
Autor:
Krähmer, Ulrich, Mahaman, Myriam
This article considers cuspidal curves whose coordinate rings are numerical semigroup algebras. Using a general result about descent of Hopf algebroid structures, their rings of differential operators are shown to be cocommutative and conilpotent lef
Externí odkaz:
http://arxiv.org/abs/2405.08490
Let $A$ be a Hopf algebra equipped with a projection onto the coordinate Hopf algebra $\mathcal{O}(G)$ of a semisimple algebraic group $G$. It is shown that if $A$ admits a suitably non-degenerate comodule $V$ and the induced $G$-module structure of
Externí odkaz:
http://arxiv.org/abs/2211.01996
Autor:
Krähmer, Ulrich, Oni, Blessing Bisola
This article studies the construction of Hopf algebras $H$ acting on a given algebra $K$ in terms of algebra morphisms $ \sigma \colon K \rightarrow \mathrm{M}_n(K)$. The approach is particularly suited for controlling whether these actions restrict
Externí odkaz:
http://arxiv.org/abs/2209.06516
The self-duality of the paracyclic category is extended to a certain class of homotopy categories of (2,1)-categories. These generalise the orbit category of a group and are associated to certain self-dual preorders equipped with a presheaf of groups
Externí odkaz:
http://arxiv.org/abs/2202.12772
Autor:
Krähmer, Ulrich, Mahaman, Myriam
The fact that the cocommutative comonoids in a symmetric monoidal category form the best possible approximation by a cartesian category is revisited when the original category is only braided monoidal. This leads to the question when the endomorphism
Externí odkaz:
http://arxiv.org/abs/2109.09634
Autor:
Karl Krähmer
Publikováno v:
Historia Agraria de América Latina, Vol 5, Iss 01 (2024)
Este artículo aborda en el caso de la fruticultura la relación contradictoria entre políticas orientadas al crecimiento económico y aquellas que buscan la sostenibilidad ecológica chilena. La historia de crecimiento de ese sector se enfrenta hoy
Externí odkaz:
https://doaj.org/article/9b25d7b28dda4ad28b007dfb1b387eb5
Publikováno v:
Julius-Kühn-Archiv, Vol 476, Pp 21-28 (2023)
Pyrrolizidinalkaloide (PA) sind sekundäre Pflanzenstoffe und dienen in erster Linie der Pflanze zum Schutz gegen Fraßfeinde. Durch Mitbeerntung PA-haltiger Beikräuter im Pflanzenbau gelangen PAs als Verunreinigung in Lebensmittel (Salate, Kräuter
Externí odkaz:
https://doaj.org/article/61675ce9ad2e45438f1f0798cc104415
Autor:
von Maydell, Daniel, Beleites, Claudia, Stache, Anne-Marie, Riewe, David, Krähmer, Andrea, Marthe, Frank
Publikováno v:
In Industrial Crops & Products February 2024 208
Autor:
Kraehmer, Ulrich, Wagner, Elmar
The quantum disc is used to define a noncommutative analogue of a dense coordinate chart and of left-invariant vector fields on quantum SU(2). This yields two twisted Dirac operators for different twists that are related by a gauge transformation and
Externí odkaz:
http://arxiv.org/abs/1912.08155
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