Zobrazeno 1 - 10
of 330
pro vyhledávání: '"GÖBEL, RÜDIGER"'
Autor:
Droste, Manfred, Göbel, Rüdiger
Let R be a domain, V a left R-module, and L a composition series of direct summands of V. Our main results show that if U is a stabilizer group of L containing the McLain-group associated with L, then U determines the chain (L,⊆) uniquely up to is
Externí odkaz:
https://ul.qucosa.de/id/qucosa%3A32475
https://ul.qucosa.de/api/qucosa%3A32475/attachment/ATT-0/
https://ul.qucosa.de/api/qucosa%3A32475/attachment/ATT-0/
Autor:
Göbel, Rüdiger, Przeździecki, Adam J.
We construct embeddings G of the category of graphs into categories of R-modules over a commutative ring R which are almost full in the sense that the maps induced by the functoriality of G R[Hom_Graphs(X,Y)] --> Hom_R(GX,GY) are isomorphisms. The sy
Externí odkaz:
http://arxiv.org/abs/1305.3458
In this paper we improve recent results dealing with cellular covers of $R$-modules. Cellular covers (sometimes called co-localizations) come up in the context of homotopical localization of topological spaces. They are related to idempotent cotriple
Externí odkaz:
http://arxiv.org/abs/0906.4183
Autor:
Göbel, Rüdiger, Shelah, Saharon
Publikováno v:
Fundamenta Mathematicae 192(2006):155-181
An R-algebra A is called E(R)-algebra if the canonical homomorphism from A to the endomorphism algebra End_RA of the R-module {}_R A, taking any a in A to the right multiplication a_r in End_R A by a is an isomorphism of algebras. In this case {}_R A
Externí odkaz:
http://arxiv.org/abs/0711.3045
Autor:
Göbel, Rüdiger, Shelah, Saharon
Publikováno v:
Proceedings of the American Mathematical Society, 135 (2007):1641-1649
A module is called absolutely indecomposable if it is directly indecomposable in every generic extension of the universe. We want to show the existence of large abelian groups that are absolutely indecomposable. This will follow from a more general r
Externí odkaz:
http://arxiv.org/abs/0711.3011
In the present paper we continue to examine cellular covers of groups, focusing on the cardinality and the structure of the kernel K of the cellular map G-> M . We show that in general a torsion free reduced abelian group M may have a proper class of
Externí odkaz:
http://arxiv.org/abs/math/0702294
Autor:
Göbel, Rüdiger, Shelah, Saharon
This continues recent work in a paper by Corner, Gobel and Goldsmith. A particular question was left open: Is it possible to carry over the results concerning the undecidability of torsion--free Crawley groups to modules over the ring of p-adic integ
Externí odkaz:
http://arxiv.org/abs/math/0504198
A ring R is called an E-ring if the canonical homomorphism from R to the endomorphism ring End(R_Z) of the additive group R_Z, taking any r in R to the endomorphism left multiplication by r turns out to be an isomorphism of rings. In this case R_Z is
Externí odkaz:
http://arxiv.org/abs/math/0404271
Autor:
Göbel, Rüdiger, Shelah, Saharon
We will answer a question raised by Emmanuel Dror Farjoun concerning the existence of torsion-free abelian groups G such that for any ordered pair of pure elements there is a unique automorphism mapping the first element onto the second one. We will
Externí odkaz:
http://arxiv.org/abs/math/0404259
Autor:
Göbel, Rüdiger, Shelah, Saharon
We characterize the groups isomorphic to full automorphism groups of ordered abelian groups. The result will follow from classical theorems on ordered groups adding an argument from proofs used to realize rings as endomorphism rings of abelian groups
Externí odkaz:
http://arxiv.org/abs/math/0112264