2018-06-19T22:35:55Z
http://bims.iranjournals.ir/?_action=export&rf=summon&issue=59
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Fiber bundles and Lie algebras of top spaces
M. R.
Farhangdoost
In this paper, by using of Frobenius theorem a relation between Lie subalgebras of the Lie algebra of a top space T and Lie subgroups of T(as a Lie group) is determined. As a result we can consider these spaces by their Lie algebras. We show that a top space with the finite number of identity elements is a C^{∞} principal fiber bundle, by this method we can characterize top spaces.
Lie group
top space
fiber bundle
Lie algebra
2013
09
01
589
598
http://bims.iranjournals.ir/article_433_60e83e555afcee71f46a98403fdecd4b.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Hybrid steepest-descent method with sequential and functional errors in Banach space
S.
Saeidi
H.
Haydari
Let $X$ be a reflexive Banach space, $T:Xto X$ be a nonexpansive mapping with $C=Fix(T)neqemptyset$ and $F:Xto X$ be $delta$-strongly accretive and $lambda$- strictly pseudocotractive with $delta+lambda>1$. In this paper, we present modified hybrid steepest-descent methods, involving sequential errors and functional errors with functions admitting a center, which generate convergent sequences to the unique solution of the variational inequality $VI^*(F, C)$. We also present similar results for a strongly monotone and Lipschitzian operator in the context of a Hilbert space and apply the results for solving a minimization problem.
fixed point
hybrid steepest-descent method
Nonexpansive mapping
variational inequality
2013
09
01
599
617
http://bims.iranjournals.ir/article_230_c22700f2141e4eab510b5c02df17748f.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Complement of Special Chordal Graphs and Vertex Decomposability
M.
Alizadeh
A.
Goodarzi
In this paper, we introduce a subclass of chordal graphs which contains $d$-trees and show that their complement are vertex decomposable and so is shellable and sequentially Cohen-Macaulay.
Cohen-Macaulay
sequentially Cohen-Macaulay
shellable complex
vertex decomposable
chordal graph
2013
09
01
619
625
http://bims.iranjournals.ir/article_256_ff24e61eaa775eccea5724d832798ec8.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
On vertex balance index set of some graphs
Ch.
Adiga
C.
Subbaraya
A.
Shrikanth
M.
Sriraj
Let Z2 = {0, 1} and G = (V ,E) be a graph. A labeling f : V → Z2 induces an edge labeling f* : E →Z2 defined by f*(uv) = f(u).f (v). For i ε Z2 let vf (i) = v(i) = card{v ε V : f(v) = i} and ef (i) = e(i) = {e ε E : f*(e) = i}. A labeling f is said to be Vertex-friendly if | v(0) − v(1) |≤ 1. The vertex balance index set is defined by {| ef (0) − ef (1) | : f is vertex-friendly}. In this paper we completely determine the vertex balance index set of Kn, Km,n, Cn×P2 and Complete binary tree.
Vertex labeling
Vertex-friendly
Vertex balance index set
2013
09
01
627
634
http://bims.iranjournals.ir/article_434_8a847dac9d4c818761d9e8df959e4b3a.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Jordan derivation on trivial extension
H.
Ghahramani
Let A be a unital R-algebra and M be a unital A-bimodule. It is shown that every Jordan derivation of the trivial extension of A by M, under some conditions, is the sum of a derivation and an antiderivation.
Jordan derivation
derivation
trivial extension
2013
09
01
635
645
http://bims.iranjournals.ir/article_251_562a2d6f67396e816d3d6bebc0ecb30e.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
An Alexandroff topology on graphs
S.
Jafarian Amiri
A.
Jafarzadeh
H.
Khatibzadeh
Let G = (V,E) be a locally finite graph, i.e. a graph in which every vertex has finitely many adjacent vertices. In this paper, we associate a topology to G, called graphic topology of G and we show that it is an Alexandroff topology, i.e. a topology in which intersec- tion of every family of open sets is open. Then we investigate some properties of this topology. Our motivation is to give an elementary step toward investigation of some properties of locally finite graphs by their corresponding topology which we introduce in this paper.
Locally finite graph
Alexandroff topology
finite topological spaces
2013
09
01
647
662
http://bims.iranjournals.ir/article_266_e1ff26c6f7b350afcde8bd3ec3654132.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Relative n-th non-commuting graphs of finite groups
A.
Erfanian
B.
Tolue
Suppose $n$ is a fixed positive integer. We introduce the relative n-th non-commuting graph $Gamma^{n} _{H,G}$, associated to the non-abelian subgroup $H$ of group $G$. The vertex set is $Gsetminus C^n_{H,G}$ in which $C^n_{H,G} = {xin G : [x,y^{n}]=1 mbox{~and~} [x^{n},y]=1mbox{~for~all~} yin H}$. Moreover, ${x,y}$ is an edge if $x$ or $y$ belong to $H$ and $xy^{n}eq y^{n}x$ or $x^{n}yeq yx^{n}$. In fact, the relative n-th commutativity degree, $P_{n}(H,G)$ the probability that n-th power of an element of the subgroup $H$ commutes with another random element of the group $G$ and the non-commuting graph were the keys to construct such a graph. It is proved that two isoclinic non-abelian groups have isomorphic graphs under special conditions.
Isoclinism
n-th non-commuting graph
n-th commutativity degree
2013
09
01
663
674
http://bims.iranjournals.ir/article_435_b9212cae8b75cb41a3069a14c760e131.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Total domination in $K_r$-covered graphs
A.
P. Kazemi
The inflation $G_{I}$ of a graph $G$ with $n(G)$ vertices and $m(G)$ edges is obtained from $G$ by replacing every vertex of degree $d$ of $G$ by a clique, which is isomorph to the complete graph $K_{d}$, and each edge $(x_{i},x_{j})$ of $G$ is replaced by an edge $(u,v)$ in such a way that $uin X_{i}$, $vin X_{j}$, and two different edges of $G$ are replaced by non-adjacent edges of $G_{I}$. The total domination number $gamma _{t}(G)$ of a graph $G$ is the minimum cardinality of a total dominating set, which is a set ofvertices such that every vertex of $G$ is adjacent to one vertex of it. A graph is $K_{r}$-covered if every vertex of it is contained in a clique $K_{r}$. Cockayne et al. in [Total domination in $K_{r}$-covered graphs, Ars Combin. textbf{71} (2004) 289-303]conjectured that the total domination number of every $K_{r}$-covered graph with $n$ vertices and no $K_{r}$-component is at most $frac{2n}{r+1}.$ This conjecture has been proved only for $3leq rleq 6$. In this paper, we prove this conjecture for a big family of $K_{r}$-covered graphs.
Total domination number
inflated graph
$K_r$-covered graph
2013
09
01
675
680
http://bims.iranjournals.ir/article_436_675fe49c341f8166308a56c5462b2fc2.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
On reverse degree distance of unicyclic graphs
Z.
Du
B.
Zhou
The reverse degree distance of a connected graph $G$ is defined in discrete mathematical chemistry as [ r (G)=2(n-1)md-sum_{uin V(G)}d_G(u)D_G(u), ] where $n$, $m$ and $d$ are the number of vertices, the number of edges and the diameter of $G$, respectively, $d_G(u)$ is the degree of vertex $u$, $D_G(u)$ is the sum of distance between vertex $u$ and all other vertices of $G$, and $V(G)$ is the vertex set of $G$. We determine the unicyclic graphs of given girth, number of pendant vertices and maximum degree, respectively, with maximum reverse degree distances. We also determine the unicyclic graphs of given number of vertices, girth and diameter with minimum degree distance.
reverse degree distance
diameter
pendant vertices
maximum degree
unicyclic graphs
2013
09
01
681
706
http://bims.iranjournals.ir/article_437_7a694edd090f25ab56c01b6e0653732b.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
A new block by block method for solving two-dimensional linear
and nonlinear Volterra integral equations of the first and second kinds
R.
Katani
S.
Shahmorad
In this paper, we propose a new method for the numerical solution of two-dimensional linear and nonlinear Volterra integral equations of the first and second kinds, which avoids from using starting values. An existence and uniqueness theorem is proved and convergence isverified by using an appropriate variety of the Gronwall inequality. Application of the method is demonstrated for solving the useful telegraph equation.
Two-dimensional Volterra integral equations
Romberg quadrature rule
Block by block method
Gronwall inequality
2013
09
01
707
724
http://bims.iranjournals.ir/article_438_91365a3b3d0f8f725e928d5050269c79.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
On p-semilinear transformations
Y.
Ma
L.
Chen
In this paper, we introduce $p$-semilinear transformations for linear algebras over a field ${bf F}$ of positive characteristic $p$, discuss initially the elementary properties of $p$-semilinear transformations, make use of it to give some characterizations of linear algebras over a field ${bf F}$ of positive characteristic $p$. Moreover, we find a one-to-one correspondence between $p$-semilinear transformations and matrices, and we prove a result which is closely related to the well-known Jordan-Chevalley decomposition of an element.
$p$-semilinear transformation
the matrix
Rank-nullity
theorem
Jordan-Chevalley decomposition
2013
09
01
725
742
http://bims.iranjournals.ir/article_439_a072c328c221cd2140b9c1991f0c1313.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Solutions of variational inequalities on fixed points of nonexpansive mappings
H.
Piri
n this paper , we propose a generalized iterative method forfinding a common element of the set of fixed points of a singlenonexpannsive mapping and the set of solutions of two variationalinequalities with inverse strongly monotone mappings and strictlypseudo-contractive of Browder-Petryshyn type mapping. Our resultsimprove and extend the results announced by many others.
fixed point
strongly monotone
$lambda$- strictly pseudo-contractive
Strongconvergence
Nonexpansive mapping
2013
09
01
743
764
http://bims.iranjournals.ir/article_440_17bed45c0dac6526de73e5e4fdbb8abc.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
Strong convergence theorem for finite family of
m-accretive operators in Banach spaces
N.
Gurudwan
B.
Sharma
The purpose of this paper is to propose a compositeiterative scheme for approximating a common solution for a finitefamily of m-accretive operators in a strictly convex Banach spacehaving a uniformly Gateaux differentiable norm. As a consequence,the strong convergence of the scheme for a common fixed point ofa finite family of pseudocontractive mappings is also obtained.
m-accretive operators
strictly convex Banach space
uniformly Gateaux differentiable norm
composite iteration
resolvent
2013
09
01
765
777
http://bims.iranjournals.ir/article_441_71f5511fa84e314d6e95a38b64d6b0f1.pdf
Bulletin of the Iranian Mathematical Society
BIMS
1017-060X
1017-060X
2013
39
4
More about measures and Jacobians of singular random matrices
J.
Diaz-Garcia
In this work are studied the Jacobians of certain singular transformations and the corresponding measures which support the jacobian computations.
Singular random matrices
Jacobian of transformation
Hausdorff measure, Lebesgue measure, multiplicity
2013
09
01
779
788
http://bims.iranjournals.ir/article_442_82fada08780c2db3a8633e602662b532.pdf