2019-07-20T10:45:31+04:30
http://ijmsi.ir/browse.php?mag_id=2&slc_lang=en&sid=1
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
SPECTRUM OF THE FOURIER-STIELTJES ALGEBRA OF A SEMIGROUP
M.
AMINI
A. R.
MEDGHALCHI
For a unital foundation topological *-semigroup S whose representations separate points of S, we show that the spectrum of the Fourier-Stieltjes algebra B(S) is a compact semitopological semigroup. We also calculate B(S) for several examples of S.
Fourier algebra
Fourier-Stieltjes algebra
amenability
weakly and strongly almost periodic functions
spectrum
foundation topological *-semigroups.
2006
11
01
1
8
http://ijmsi.ir/article-1-34-en.pdf
10.7508/ijmsi.2006.02.001
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
BLOW-UP AND NONGLOBAL SOLUTION FOR A FAMILY OF NONLINEAR HIGHER-ORDER EVOLUTION PROBLEM
H.
ASSA
M.
HESAARAKI
A.
MOAMENI
In this paper we consider a kind of higher-order evolution equation as^{kt^{k} + ^{k;minus1}u/t^{k;minus1} +• • •+ut ;minus{delta}u= f (u, {delta}u,x). For this equation, we investigate nonglobal solution, blow-up in finite time and instantaneous blow-up under some assumption on k, f and initial data. In this paper we employ the Test function method, the eneralized convexity method and Galerkin’s method for some of our proofs. Moreover, occasionally by changing P.D.E problems to some ordinary differential inequalities, we investigate this kind of higher-order evolution equations.
Higher-order evolution equations
blow-up
nonglobal solution
instanta instantaneous blow-up.
2006
11
01
9
30
http://ijmsi.ir/article-1-35-en.pdf
10.7508/ijmsi.2006.02.002
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
RICCI CURVATURE OF SUBMANIFOLDS OF A SASAKIAN SPACE FORM
SUNGPU
HONG
MUKUT
TRIPATHI
Involving the Ricci curvature and the squared mean curvature, we obtain basic inequalities for different kind of submaniforlds of a Sasakian space form tangent to the structure vector field of the ambient manifold. Contrary to already known results, we find a different necessary and sufficient condition for the equality for Ricci curvature of C-totally real submanifolds of a Sasakian space form, and (2) of the fact that if a C-totally real submanifold of maximum dimension satisfies the equality case, then it must be must be minimal. Two basic inequalities for submanifolds of any Riemannian manofild, one involving scaler curvature and the squared mean curvature and the other involving the invariant and the squared mean curvature are also obtained. These results are applied to get corresponding results for submanifolds of Sasakian space forms.
Einstein manifold
Saskian space form
Invarient submanifold
Semi-invarient submanifold
Almost semi-invariant submanifold
CR-submanifold
Slant submanifold
C-totally real submanifold
Ricci curvature
K-Ricci curvature
Scalar curvature.
2006
11
01
31
51
http://ijmsi.ir/article-1-36-en.pdf
10.7508/ijmsi.2006.02.003
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
INTEGER-MAGIC SPECTRA OF CYCLE RELATED GRAPHS
EBRAHIM
SALEHI
For any h in N , a graph G = (V, E) is said to be h-magic if there exists a labeling l: E(G) to Z_{h}-{0} such that the induced vertex set labeling l^{+: V(G) to Z_{h}} defined by l^{+}(v)= Summation of l(uv)such that e=uvin in E(G) is a constant map. For a given graph G, the set of all for which G is h-magic is called the integer-magic spectrum of G and is denoted by IM(G). In this paper, the integer-magic spectra of certain classes of cycle related graphs will be determined.
magic
non-magic
integer-magic spectrum.
2006
11
01
53
63
http://ijmsi.ir/article-1-37-en.pdf
10.7508/ijmsi.2006.02.004
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
4-PLACEMENT OF ROOTED TREES
H
YOUSEFI-AZARI
A
GOODARZI
A tree T of order n is called k-placement if there are k edge-disjoint copies of T into K_{n}. In this paper we prove some results about 4-placement of rooted trees.
Embedding
Packing
K-placement
Star-path.
2006
11
01
65
77
http://ijmsi.ir/article-1-38-en.pdf
10.7508/ijmsi.2006.02.005
Iranian Journal of Mathematical Sciences and Informatics
IJMSI
1735-4463
2008-9473
7
2006
1
2
A NOTE VIA DIAGONALITY OF THE 2 × 2 BHATTACHARYYA MATRICES
G. R.
MOHTASHAMI BORZADARAN
In this paper, we consider characterizations based on the Bhattacharyya matrices. We characterize, under certain constraint, dis tributions such as normal, compound poisson and gamma via the diago nality of the 2 X 2 Bhattacharyya matrix.
Exponential Families
Bhattacharyya Bounds
Rao-Cramer Inequality
Fisher Information
Diagonality of the Bhattacharyya matrices.
2006
11
01
79
84
http://ijmsi.ir/article-1-39-en.pdf
10.7508/ijmsi.2006.02.006