Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Ulrich Krähmer"'
Autor:
Ulrich Krähmer, Manuel Martins
Publikováno v:
Journal of Noncommutative Geometry. 14:667-680
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f0ac766715468ad4deae9574693e2611
https://doi.org/10.4171/jncg/376
https://doi.org/10.4171/jncg/376
Autor:
Ulrich Krähmer, Lucia Rotheray
Publikováno v:
Glasgow Mathematical Journal. 63:139-157
Incidence coalgebras of categories in the sense of Joni and Rota are studied, specifically cases where a monoidal product on the category turns these into (weak) bialgebras. The overlap with the theory of combinatorial Hopf algebras and that of Hopf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60b7b383f37a3b9623a8c29c86feaea9
https://doi.org/10.1017/s0017089520000075
https://doi.org/10.1017/s0017089520000075
Autor:
Friedrich Wagemann, Ulrich Krähmer
Publikováno v:
Forum Mathematicum. 31:1305-1315
We construct a bialgebra object in the category of linear maps ℒ ℳ {\mathcal{LM}} from a cocommutative rack bialgebra. The construction does extend to some non-cocommutative rack bialgberas, as is illustrated by a concrete example. As a separ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a70c705fce81fa9f38dd3de2bb1d948
https://doi.org/10.1515/forum-2018-0238
https://doi.org/10.1515/forum-2018-0238
Autor:
Ulrich Krähmer, Sebastian Halbig
Publikováno v:
Trends in Mathematics ISBN: 9783030340711
The aim of this short note is to communicate an example of a finitedimensional Hopf algebra that does not admit a modular pair in involution in the sense of Connes and Moscovici.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71d6728b8364ad9d4582ec8c0ff47df0
https://doi.org/10.1007/978-3-030-34072-8_14
https://doi.org/10.1007/978-3-030-34072-8_14
Autor:
Ulrich Krähmer, Ana Rovi
Publikováno v:
Communications in Algebra. 43:4049-4053
The aim of this note is to communicate a simple example of a Lie–Rinehart algebra whose enveloping algebra is not a Hopf algebroid, neither in the sense of Bohm and Szlachanyi, nor in the sense of Lu.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e1eb3b585626e71ba1ae6c960901c13
https://doi.org/10.1080/00927872.2014.896375
https://doi.org/10.1080/00927872.2014.896375
Autor:
Angela Ankomaah Tabiri, Ulrich Krähmer
The cusp was recently shown to admit the structure of a quantum homogeneous space, that is, its coordinate ring B can be embedded as a right coideal subalgebra into a Hopf algebra A such that A is faithfully flat as a B-module. In the present article
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e91540e68ff647845131a1deaceac55
https://eprints.gla.ac.uk/131664/8/131664.pdf
https://eprints.gla.ac.uk/131664/8/131664.pdf
Autor:
Jake Goodman, Ulrich Krähmer
Publikováno v:
Journal of Algebra. 406:272-289
Twisted Calabi–Yau algebras are a generalisation of Ginzburg's notion of Calabi–Yau algebras. Such algebras A come equipped with a modular automorphism σ ∈ Aut ( A ) , the case σ = id being precisely the original class of Calabi–Yau algebra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da8205fd0576836b912a0e476fab053f
https://doi.org/10.1016/j.jalgebra.2014.02.018
https://doi.org/10.1016/j.jalgebra.2014.02.018
Autor:
Vladimir Dotsenko, Ulrich Krähmer
Publikováno v:
Oberwolfach Reports. 11:595-634
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90911386de50e6232f9d876b79561414
https://doi.org/10.4171/owr/2014/11
https://doi.org/10.4171/owr/2014/11
Autor:
Elmar Wagner, Ulrich Krähmer
Publikováno v:
Journal of K-Theory. 12:257-271
The fundamental Hochschild cohomology class of the standard Podleś quantum sphere is expressed in terms of the spectral triple of Dąabrowski and Sitarz by means of a residue formula.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e921bb6a1d4f25d5a62a747fa109c72d
https://doi.org/10.1017/is013001019jkt199
https://doi.org/10.1017/is013001019jkt199
Autor:
Ulrich Krähmer, Niels Kowalzig
Publikováno v:
Journal für die reine und angewandte Mathematik (Crelles Journal). 2014:159-219
This article studies the algebraic structure of homology theories defined by a left Hopf algebroid U over a possibly noncommutative base algebra A, such as for example Hochschild, Lie algebroid (in particular Lie algebra and Poisson), or group and et
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a16d6d6a0d51b3a8a25e73e9b711db1
https://doi.org/10.1515/crelle-2012-0086
https://doi.org/10.1515/crelle-2012-0086