Kragujevac Journal of Mathematics
University of Kragujevac - Faculty of Science

EDITORIAL BOARD

CONCIRCULAR VECTOR FIELDS AND PSEUDO-KAEHLER MANIFOLDS

Author: BANG-YEN CHEN
Keyword: Pseudo-Kaehler manifold; concircular vector field; concurrent vector field.
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7-14

NEW WEIGHTED INTEGRAL INEQUALITIES FOR TWICE DIFFERENTIABLE CONVEX FUNCTIONS

Author: M. Z. SARIKAYA, S. ERDEN
Keyword: Hermite-Hadamard inequality, Ostrowski inequality, Trapezoid inequality,convex function, Hölder inequality, Rieman-Liouville integrals.
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15-33

ON THE CHARACTERIZATION OF A CLASS OF FOUR DIMENSIONAL MATRICES AND STEINHAUS TYPE THEOREMS

Author: M. YEŞILKAYAGIL, F. BAŞAR
Keyword: Double sequence, double series, Pringsheim convergence, Steinhaus type theorems, matrix transformations.
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35-45

ON PARALLEL RULED SURFACES IN GALILEAN SPACE

Author: M. DEDE, C. EKICI
Keyword: Parallel surfaces, Galilean space, ruled surfaces.
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47-59

DIRECT LIMIT DERIVED FROM TWIST PRODUCT ON Γ-SEMIHYPERGROUPS

Author: S. OSTADHADI-DEHKORDI
Keyword: Γ-semihypergroup, left(right)(Δ,G)-set, twist product, push out system, direct system, direct limit.
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61-72

ON A CONJECTURE OF HARMONIC INDEX AND DIAMETER OF GRAPHS

Author: J. AMALORPAVA JERLINE, L. BENEDICT MICHAELRAJ
Keyword: Harmonic index, diameter, unicyclic graph.
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73-78

EXTREMAL ENERGY OF DIGRAPHS WITH TWO LINEAR SUBDIGRAPHS

Author: RASHID FAROOQ, MEHTAB KHAN, YASIR MASOOD
Keyword: Energy of a digraph, bicyclic digraphs, linear subdigraphs.
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79-89

ON β-ABSOLUTE CONVERGENCE OF VILENKIN-FOURIER SERIES WITH SMALL GAPS

Author: BHIKHA LILA GHODADRA
Keyword: Hölder’s inequality, Jensen’s inequality, Wiener-Ingham inequality, function of generalized bounded fluctuation, Vilenkin-Fourier series, β-absolute convergence, lacunary series with small gaps.
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91-104

NOTE ABOUT ASYMPTOTIC BEHAVIOUR OF POSITIVE SOLUTIONS OF SUPERLINEAR DIFFERENTIAL EQUATION OF EMDEN-FOWLER TYPE AT ZERO

Author: MARIJA MIKIĆ
Keyword: Superlinear Emden-Fowler differential equation, asymptotic behavior of solutions, asymptotic equivalence.
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105-112

INEQUALITIES FOR THE POLAR DERIVATIVE OF A POLYNOMIAL WITH RESTRICTED ZEROS

Author: AHMAD ZIREH, MAHMOOD BIDKHAM
Keyword: Polynomial, inequality, maximum modulus, polar derivative, restricted zeros.
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113-124

ON STRONGLY EDGE IRREGULAR FUZZY GRAPHS

Author: N. R. SANTHIMAHESWARI, C. SEKAR
Keyword: degree and total degree of a vertex in fuzzy graphs, irregular fuzzy graph, totally irregular fuzzy graph, strongly irregular fuzzy graph, edge degree in fuzzy graph, total edge degree in fuzzy graph, edge regular fuzzy graphs.
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125-135