نتایج جستجو برای: order dense injective

تعداد نتایج: 969159  

Journal: :Progress of Theoretical Physics 1988

2007
VOLKMAR WELKER

Let S be a finite alphabet. An injective word over S is a word over S such that each letter in S appears at most once in the word. We study Boolean cell complexes of injective words over S and their commutation classes. This generalizes work by Farmer and by Björner and Wachs on the complex of all injective words. Specifically, for an abstract simplicial complex ∆, we consider the Boolean cell ...

Journal: :Transactions of the American Mathematical Society 1964

2006
Dietrich Kuske Markus Lohrey

The logic L(Qu) extends first-order logic by a generalized form of counting quantifiers (“the number of elements satisfying ... belongs to the set C”). This logic is investigated for structures with an injective ω-automatic presentation. If first-order logic is extended by an infinityquantifier, the resulting theory of any such structure is known to be decidable [5]. It is shown that, as in the...

2009
Francois Couchot

It is proved that localizations of injective R-modules of finite Goldie dimension are injective if R is an arithmetical ring satisfying the following condition: for every maximal ideal P , RP is either coherent or not semicoherent. If, in addition, each finitely generated R-module has finite Goldie dimension, then localizations of finitely injective R-modules are finitely injective too. Moreove...

Journal: :Rendiconti del Seminario Matematico della Università di Padova 2015

Journal: :Int. J. Math. Mathematical Sciences 2008
Zhu Zhanmin Xiaoxiang Zhang

Let R be a ring and let M be a right R-module with S End MR . M is called almost general quasiprincipally injective or AGQP-injective for short if, for any 0/ s ∈ S, there exist a positive integer n and a left ideal Xsn of S such that s / 0 and lS Ker s Ss ⊕ Xsn . Some characterizations and properties of AGQP-injective modules are given, and some properties of AGQP-injective modules with additi...

2007
JAKOB JONSSON VOLKMAR WELKER

Let S be a finite alphabet. An injective word over S is a word over S such that each letter in S appears at most once in the word. We study Boolean cell complexes of injective words over S and their commutation classes. This generalizes work by Farmer and by Björner and Wachs on the complex of all injective words. Specifically, for an abstract simplicial complex ∆, we consider the Boolean cell ...

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