Articles

AN APPROACH FOR SIMULTANEOUSLY DETERMINING THE OPTIMAL TRAJECTORY AND CONTROL OF A VIBRATING SHELL

In this article, for a two-dimensional wave control system, we are going to present a new combinational solution path. First, by considering all necessary conditions, the problem is represented in a variational format in which the trajectory is shown by a trigonometric series with the unknown coefficients.

S. EBRAHIMI
A. FAKHARZADEH J.
H. R. SAHEBI

ON (1,2)* - rw - CLOSED SETS AND (1,2)*- rw -OPEN SETS

The aim of this paper is to introduce the concept of (1,2)*-rw-closed sets in bitopological spaces and study some of its properties. Their corresponding (1,2)*-rw-open sets are also defined and studied in this paper.

O. RAVI
S. PIOUS MISSIER
K. MAHABOOB H.SHERIEFF

CERTAIN CLASSES OF UNIVALENT FUNCTIONS HAVING NEGATIVE COEFFICIENTS

Eight classes of univalent analytic functions with negative coefficients, involving Ruscheweyh derivative and a linear operator, have been studied in regard to coefficient inequality, distortion theorems, extreme points, radii of starlikeness and convexity.

VANITA JAIN

ON SOME NEW INEQUALITIES RELATED TO FEJ´ER’S INEQUALITY FOR SUPERQUADRATIC FUNCTIONS

In this paper some new inequalities related to Fej´er’s inequality and Hermite - Hadamard’s inequality for superquadratic functions are established. We also get refinements of some known results established in [20] when superquadratic function is non-negative and hence convex. 

MUHAMMAD AMER LATIF

AN UPPER BOUND FOR THE RAMSEY NUMBER R(C6, K9)

Let  C_m denote a cycle of length m and  K_n a complete graph of order n. In this paper we establish an upper bound for the Ramsey number of r(C₆,K₉) by proving that 41 £ r(C₆,K₉) £ 46.

ALRHAYYEL A. A. M.
BATAINEH M. S. A.
ALZAALIG A. M. N.