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
by Alejandra Alvarado
Pages: 3–6

Non-integerness of class of hyperharmonic numbers
by Rachid Aït Amrane, Hacène Belbachir
Pages: 7–11

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
by A. L. Barrenechea
Pages: 21–38

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
by Tamás Bérczes, Gábor Guta, Gábor Kusper, Wolfgang Schreiner, János Sztrik
Pages: 51–75

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
by Ferenc Mátyás, Kálmán Liptai, János T. Tóth, Ferdinánd Filip
Pages: 101–106

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
by Jonathan Sondow, Diego Marques
Pages: 151–164

Geometric properties and constrained modification of trigonometric spline curves of Han
by Ede M. Troll, Miklós Hoffmann
Pages: 165–175

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
by Rita Nagy-Kondor
Pages: 199–210

C++ exam methodology
by Norbert Pataki, Zalán Szűgyi
Pages: 211–223

The software developers’ view on product metrics — A survey-based experiment
by István Siket, Tibor Gyimóthy
Pages: 225–240

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