2019-05-22T01:29:00Z
http://jas.shahroodut.ac.ir/?_action=export&rf=summon&issue=35
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
Upper bounds for finiteness of generalized local cohomology modules
Moharram
Aghapournahr
Let $R$ be a commutative Noetherian ring with non-zero identity and $a$ an ideal of $R$. Let $M$ be a finite $R$--module<br />of finite projective dimension and $N$ an arbitrary finite $R$--module. We characterize the membership of the generalized local cohomology modules $H^{i}_{a}(M,N)$ in certain Serre subcategories of the category of modules from upper bounds. We define and study the properties of a generalization of cohomological dimension of generalized local cohomology modules. Let $mathcal S$ be a Serre subcategory of the category of $R$--modules and $n > pd M$ be an integer such that $H^{i}_{a}(M,N)$ belongs to $mathcal S$ for all $i> n$. Then, for any ideal $bsupseteq a$, it is also shown that the module $H^{n}_{a}(M,N)/{b}H^{n}_{a}(M,N)$ belongs to $mathcal S$.<br /><br />
Generalized local cohomology module
Serre subcategory
cohomological dimension
2013
09
15
1
9
http://jas.shahroodut.ac.ir/article_169_c37d47751d382a040ab25cdfc4d74ec6.pdf
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
f-DERIVATIONS AND (f; g)-DERIVATIONS OF MV -ALGEBRAS
L.
Kamali Ardakani
Bijan
Davvaz
Recently, the algebraic theory of MV -algebras is intensively studied. <br />In this paper, we extend the concept of derivation of $MV$-algebras and we give some<br />illustrative examples. Moreover, as a generalization of derivations of $MV$ -algebras<br />we introduce the notion of $f$-derivations and $(f; g)$-derivations of $MV$-algebras.<br />Also, we investigate some properties of them.
MV -algebra
Lattice
BCIBCK-algebra
derivation
2013
09
15
11
31
http://jas.shahroodut.ac.ir/article_167_3a68dccc76e6f69f9a0255ccc7a9453a.pdf
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
NETS AND SEPARATED S-POSETS
Mahdieh
Haddadi
Nets, useful topological tools, used to generalize certain concepts that may only be general enough in the context of metric<br />spaces. In this work we introduce this concept in an $S$-poset, a poset with an action of a posemigroup $S$ on it which<br />is a very useful structure in computer sciences and interesting for mathematicians, and give the the concept of $S$-net. Using $S$-nets and its convergency we also give some characterizations of separated $S$-posets. Also, introducing the net-closure operators, we investigate the counterparts of topological separation axioms on $S$-posets and study their relation to separated $S$-posets.
$S$-poset
Separated $S$-poset
Separation axioms
2013
09
15
33
43
http://jas.shahroodut.ac.ir/article_166_38e125e00d02238374d1cc0c2152786e.pdf
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
SOLVABILITY OF FREE PRODUCTS, CAYLEY GRAPHS AND COMPLEXES
Hanieh
Mirebrahimi
Fatemeh
Ghanei
In this paper, we verify the solvability of free product of finite cyclic groups with topological methods. We use Cayley graphs and Everitt methods to construct suitable 2-complexes corresponding to the presentations of groups and their commutator subgroups. In particular, using these methods, we prove that the commutator subgroup of ${Z}_{m}*{Z}_{n}$ is free of rank $(m-1)(n-1)$ for all $m,ngeq2$
simplicial complex
fundamental group
covering space
Caley graph
solvable group
2013
09
15
45
52
http://jas.shahroodut.ac.ir/article_165_76e847bc1b83709351833bc141c00f5a.pdf
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
ON SELBERG-TYPE SQUARE MATRICES INTEGRALS
Mohammad
Arashi
In this paper we consider Selberg-type square matrices integrals with focus on Kummer-beta types I & II integrals. For generality of the results for real normed division algebras, the generalized matrix variate Kummer-beta types I & II are defined under the abstract algebra. Then Selberg-type integrals are calculated under<br />orthogonal transformations.
Selberg-Type integrals
Real normed division algebras
Kummer-beta distribution
Random matrix
2013
09
15
53
65
http://jas.shahroodut.ac.ir/article_164_0aa20d6e72bc0fdaf5b8905e0d0e5859.pdf
Journal of Algebraic Systems
JAS
2345-5128
2345-5128
2013
1
1
GENERALIZATIONS OF δ-LIFTING MODULES
Yahya
Talebi
Mehrab
Hosseinpour
In this paper we introduce the notions of $G_{1}^{*}L$-module and $G_{2}^{*}L$-module which are two proper generalizations of $delta$-lifting modules. We give some characterizations and properties of these modules. We show that a<br />$G_{2}^{*}L$-module decomposes into a semisimple submodule $M_{1}$ and a submodule $M_{2}$ of $M$ such that every non-zero submodule of $M_{2}$ contains a non-zero $delta$-cosingular submodule.
δ-cosingular
non-δ-cosingular
G∗L-module
2013
09
15
67
77
http://jas.shahroodut.ac.ir/article_168_779f9060623194a54be4107cc9186779.pdf