Dedicated to professor Béla Pelle on his 80th birthday

ISSN 1787-5021 (Print)
ISSN 1787-6117 (Online)

Editorial Board: Sándor Bácsó, Sonja Gorjanc, Tibor Gyimóthy, Miklós Hoffmann, József Holovács, László Kozma, Kálmán Liptai, Florian Luca, Giuseppe Mastroianni, Ferenc Mátyás, Ákos Pintér, Miklós Rontó, László Szalay, János Sztrik, Gary Walsh Technical Editor: Tibor Tómács

Content

Research papers:

Arithmetic progressions on quartic elliptic curves
a research paper by Alejandra Alvarado
Published online:

Non-integerness of class of hyperharmonic numbers
a research paper by Rachid Aït Amrane, Hacène Belbachir
Published online:

Conditions for groups whose group algebras have minimal Lie derived length
by Zsolt Balogh, Tibor Juhász
Pages: 13-20

Regularity of certain Banach valued stochastic processes
a research paper by A. L. Barrenechea
Published online:

Periodic fixed points of random operators
by Ismat Beg, Mujahid Abbas, Akbar Azam
Pages: 39-49

Evaluating a probabilistic model checker for modeling and analyzing retrial queueing systems
a research paper by Tamás Bérczes, Gábor Guta, Gábor Kusper, Wolfgang Schreiner, János Sztrik
Published online:

On the skeleton of a finite transformation semigroup
by Attila Egri-Nagy, Chrystopher L. Nehaniv
Pages: 77-84

On the best estimations for dispersions of special ratio block sequences
by Ferdinánd Filip, Kálmán Liptai, Ferenc Mátyás, János T. Tóth
Pages: 85-93

Some inequalities for q-polygamma function and ζ_q-Riemann zeta functions
by Valmir Krasniqi, Toufik Mansour, Armend Shaban Shabani
Pages: 95-100

Polynomials with special coefficients
a research paper by Ferenc Mátyás, Kálmán Liptai, János T. Tóth, Ferdinánd Filip
Published online:

On perfect numbers which are ratios of two Fibonacci numbers
by Florian Luca, V. Janitzio Mejia Huguet
Pages: 107-124

Properties of balancing, cobalancing and generalized balancing numbers
by Péter Olajos
Pages: 125-138

Signed (k,k)-domatic number of a graph
by Seyed Mahmoud Sheikholeslami, Lutz Volkmann
Pages: 139-149

Algebraic and transcendental solutions of some exponential equations
a research paper by Jonathan Sondow, Diego Marques
Published online:

Geometric properties and constrained modification of trigonometric spline curves of Han
a research paper by Ede M. Troll, Miklós Hoffmann
Published online:

CTH B-spline curves and its applications
by Jin Xie, Jieqing Tan, Shengfeng Li
Pages: 177-189

Methodological papers:

Solving certain quintics
by Raghavendra G. Kulkarni
Pages: 193-197

Spatial Ability, Descriptive Geometry and Dynamic Geometry Systems
a methodological paper by Rita Nagy-Kondor
Published online:

C++ exam methodology
a methodological paper by Norbert Pataki, Zalán Szűgyi
Published online:

The software developers’ view on product metrics — A survey-based experiment
a methodological paper by István Siket, Tibor Gyimóthy
Published online:

Mathematical competences examined on secondary school students
by Ilona Téglási
Pages: 241-257