Iranian Journal of Mathematical Sciences and Informatics
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Iranian Journal of Mathematical Sciences and Informatics - Journal articles for year 2006, Volume 1, Number 2Yektaweb Collection - http://www.yektaweb.comen2006/11/10SPECTRUM OF THE FOURIER-STIELTJES ALGEBRA OF A SEMIGROUP
http://ijmsi.ir/browse.php?a_id=34&sid=1&slc_lang=en
<p>For a unital foundation topological <sub>*</sub>-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.</p>
M. AMINIBLOW-UP AND NONGLOBAL SOLUTION FOR A FAMILY OF NONLINEAR HIGHER-ORDER EVOLUTION PROBLEM
http://ijmsi.ir/browse.php?a_id=35&sid=1&slc_lang=en
<p>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.</p>
H. ASSARICCI CURVATURE OF SUBMANIFOLDS OF A SASAKIAN SPACE FORM
http://ijmsi.ir/browse.php?a_id=36&sid=1&slc_lang=en
<p>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.</p>
SUNGPU HONGINTEGER-MAGIC SPECTRA OF CYCLE RELATED GRAPHS
http://ijmsi.ir/browse.php?a_id=37&sid=1&slc_lang=en
<p>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.</p>
EBRAHIM SALEHI4-PLACEMENT OF ROOTED TREES
http://ijmsi.ir/browse.php?a_id=38&sid=1&slc_lang=en
<p>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.</p>
H YOUSEFI-AZARIA NOTE VIA DIAGONALITY OF THE 2 × 2 BHATTACHARYYA MATRICES
http://ijmsi.ir/browse.php?a_id=39&sid=1&slc_lang=en
<p>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.</p>
G. R. MOHTASHAMI BORZADARAN