Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Arens-irregularity of tensor product of Banach algebras
1
8
110
10.22075/ijnaa.2014.110
EN
T.
Yazdanpanah
aDepartment of Mathematics, Persian Gulf University, Boushehr, 75168, Iran.
R.
Gharibi
aDepartment of Mathematics, Persian Gulf University, Boushehr, 75168, Iran.
Journal Article
2014
02
17
We introduce Banach algebras arising from tensor norms. By these Banach algebras we make Arens<br />regular Banach algebras such that tensor product becomes irregular, where is tensor norm. We<br />illustrate injective tensor product, does not preserve bounded approximate identity and it is not<br />algebra norm.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Certain subalgebras of Lipschitz algebras of infinitely differentiable functions and their maximal ideal spaces
9
22
111
10.22075/ijnaa.2014.111
EN
D.
Alimohammadi
Department of Mathematics, Faculty of Science, Arak University, P. O. Box: 38156-8-8349, Arak, Iran.
F.
Nezamabadi
Department of Mathematics, Faculty of Science, Arak University, P. O. Box: 38156-8-8349, Arak, Iran.
Journal Article
2014
02
17
We study an interesting class of Banach function algebras of innitely dierentiable functions on<br />perfect, compact plane sets. These algebras were introduced by Honary and Mahyar in 1999, called<br />Lipschitz algebras of innitely dierentiable functions and denoted by Lip(X;M; ), where X is a<br />perfect, compact plane set, M = fMng1n<br />=0 is a sequence of positive numbers such that M0 = 1 and<br />(m+n)!<br />Mm+n<br /> ( m!<br />Mm<br />)( n!<br />Mn<br />) for m; n 2 N [ f0g and 2 (0; 1]. Let d = lim sup( n!<br />Mn<br />)<br />1<br />n and Xd = fz 2 C :<br />dist(z;X) dg. Let LipP;d(X;M; )[LipR;d(X;M; )] be the subalgebra of all f 2 Lip(X;M; )<br />that can be approximated by the restriction to Xd of polynomials [rational functions with poles o<br />Xd]. We show that the maximal ideal space of LipP;d(X;M; ) is cXd, the polynomially convex hull<br />of Xd, and the maximal ideal space of LipR;d(X;M; ) is Xd, for certain compact plane sets.. Using<br />some formulae from combinatorial analysis, we nd the maximal ideal space of certain subalgebras<br />of Lipschitz algebras of innitely dierentiable functions.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Ternary (sigma,tau,xi)-derivations on Banach ternary algebras
23
35
112
10.22075/ijnaa.2014.112
EN
M.
Eshaghi Gordji
Department of Mathematics, Semnan University, P. O. Box 35195-363, Semnan, Iran.
F.
Farrokhzad
Department of Mathematics, Shahid Beheshti University, Tehran, Iran.
S.A.R.
Hosseinioun
Department of Mathematical Sciences, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Journal Article
2014
02
19
Let A be a Banach ternary algebra over a scalar eld R or C and X be a Banach ternary A-module.<br />Let ; and be linear mappings on A, a linear mapping D : (A; [ ]A) ! (X; [ ]X) is called a ternary<br />(; ; )-derivation, if<br />D([xyz]A) = [D(x) (y)(z)]X + [(x)D(y)(z)]X + [(x) (y)D(z)]X<br />for all x; y; z 2 A.<br />In this paper, we investigate ternary (; ; )-derivation on Banach ternary algebras, associated<br />with the following functional equation<br />f(<br />x + y + z<br />4<br />) + f(<br />3x y 4z<br />4<br />) + f(<br />4x + 3z<br />4<br />) = 2f(x) :<br />Moreover, we prove the generalized Ulam{Hyers stability of ternary (; ; )-derivations on Banach<br />ternary algebras.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Contractive maps in Mustafa-Sims metric spaces
36
53
113
10.22075/ijnaa.2014.113
EN
M.
Turinici
"A. Myller" Mathematical Seminar, "A. I. Cuza" University, 700506 Iasi, Romania.
Journal Article
2014
02
19
The xed point result in Mustafa-Sims metrical structures obtained by Karapinar and Agarwal<br />[Fixed Point Th. Appl., 2013, 2013:154] is deductible from a corresponding one stated in terms of<br />anticipative contractions over the associated (standard) metric space.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Tripled partially ordered sets
54
63
114
10.22075/ijnaa.2014.114
EN
M.
Eshaghi
Department of Mathematics, Semnan University, P. O. Box 35195-363, Semnan, Iran
A.
Jabbari
Department of Mathematics, Ardabil Branch, Islamic Azad University, Ardabil, Iran
S.
Mohseni
Department of Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, Babolsar, Iran.
Journal Article
2014
02
19
In this paper, we introduce tripled partially ordered sets and monotone functions on tripled partially<br />ordered sets. Some basic properties on these new dened sets are studied and some examples for<br />clarifying are given.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
A fixed point result for a new class of set-valued contractions
64
70
115
10.22075/ijnaa.2014.115
EN
A.
Sadeghi Hafjejani
Department of Mathematics, University of Shahrekord,
Shahrekord, 88186-34141, Iran.
A.
Amini Harandi
Department of Mathematics, University of Shahrekord,
Shahrekord, 88186-34141, Iran.
Journal Article
2014
02
20
In this paper, we introduce a new class of set-valued contractions and obtain a xed point theorem<br />for such mappings in complete metric spaces. Our main result generalizes and improves many well-<br />known xed point theorems in the literature.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
On a more accurate multiple Hilbert-type inequality
71
79
116
10.22075/ijnaa.2014.116
EN
Q.
Huang
Department of Mathematics, Guangdong University of Education, Guangzhou, Guangdong 510303, P. R. China.
B.
Yang
Department of Mathematics, Guangdong University of Education, Guangzhou, Guangdong 510303, P. R. China.
Journal Article
2014
02
20
By using Euler-Maclaurin's summation formula and the way of real analysis, a more accurate multiple<br />Hilbert-type inequality and the equivalent form are given. We also prove that the same constant<br />factor in the equivalent inequalities is the best possible.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
A multidimensional discrete Hilbert-type inequality
80
88
117
10.22075/ijnaa.2014.117
EN
B.
Yang
Department of Mathematics, Guangdong University of Education, Guangzhou, Guangdong 510303, P. R. China.
Journal Article
2014
02
20
In this paper, by using the way of weight coecients and technique of real analysis, a multidimensional<br />discrete Hilbert-type inequality with a best possible constant factor is given. The equivalent<br />form, the operator expression with the norm are considered.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
A companion of Ostrowski's inequality for functions of bounded variation and applications
89
97
118
10.22075/ijnaa.2014.118
EN
S.S.
Dragomir
School of Computational & Applied Mathematics, University of the Witwatersrand, Private Bag 3, Johannesburg 2050,
South Africa.
Journal Article
2014
02
20
A companion of Ostrowski's inequality for functions of bounded variation and applications are given.
Semnan University
International Journal of Nonlinear Analysis and Applications
2008-6822
5
1 (Special Issue)
2014
01
01
Some new extensions of Hardy`s inequality
98
109
119
10.22075/ijnaa.2014.119
EN
A.R.
Moazzen
Department of Mathematics, Velayat University, Iranshahr, Iran.
R.
Lashkaripour
Department of Mathematics, University of Sistan and Baluchestan, Zahedan, Iran.
Journal Article
2014
02
20
In this study, by a non-negative homogeneous kernel k we prove some extensions of Hardy's inequality<br />in two and three dimensions