نتایج جستجو برای: sigma rigid modules

تعداد نتایج: 122719  

Journal: :International Mathematics Research Notices 2016

Journal: :Journal of the London Mathematical Society 1984

Journal: :Ann. Pure Appl. Logic 2007
Pedro A. Guil Asensio Ivo Herzog

Let R be an associative ring with identity. It is shown that every Σ -cotorsion left R-module satisfies the descending chain condition on divisibility formulae. If R is countable, the descending chain condition on M implies that it must be Σ -cotorsion. It follows that, for countable R, the class of Σ -cotorsion modules is closed under elementary equivalence and pure submodules. The modules M t...

Journal: :Taiwanese Journal of Mathematics 2022

In this paper, we consider a depth inequality of Auslander which holds for finitely generated Tor-rigid modules over commutative Noetherian local rings. We raise the question whether such can be extended $n$-Tor-rigid modules, and obtain an affirmative answer $2$-Tor-rigid that are generically free. Furthermore, in appendix, use Dao's eta function determine new classes hypersurfaces quotient un...

2008
SILVANA BAZZONI JAN ŠŤOVÍČEK

We give a characterization of Σ-cotorsion modules over valuation domains in terms of descending chain conditions on certain chains of definable subgroups. We prove that pure submodules, direct products and modules elementarily equivalent to a Σ-cotorsion module are again Σ-cotorsion. Moreover, we describe the structure of Σ-cotorsion modules.

Journal: :AI Commun. 1992
John Balder Hans Akkermans

specify causeModel hypothesis observable observationModel sigma symptom sigma Balder et. al.: Building Formal KADS-II Models Figure 3: Menufor an item in a layer. band animation, connect modules. TheME generates the appropriate formal statements; • removing, modules can be removed, but only in those cases where no other modules depend on them; • renaming, if the name of a module is changed all ...

2009
HENNING HAAHR MASAHARU KANEDA M. KANEDA

Let Uq denote the quantum group associated with a finite dimensional semisimple Lie algebra. Assume that q is a complex root of unity of odd order and that Uq is obtained via Lusztig’s q-divided powers construction. We prove that all regular projective (tilting) modules for Uq are rigid, i.e., have identical radical and socle filtrations. Moreover, we obtain the same for a large class of Weyl m...

2012
Faramak Zandi Andrew S. Borchers

Purpose: In recent years, although several studies have focused on Lean Six Sigma project selection, none of them have applied a Lean Six Sigma approach to evaluate e-health reference architectures. Therefore, there is a significant gap of Lean Six Sigma application for e-Health architectures in e-Health care quality improvement literature. In this paper, we present a Lean Six Sigma approach to...

2015
GÁBOR HORVÁTH

We provide polynomial time algorithms for deciding equation solvability and identity checking over groups that are semidirect products of two nite Abelian groups. Our main method is to reduce these problems to the sigma equation solvability and sigma equivalence problems over modules for commutative unital rings.

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