ISSN 1450–5932 eISSN 2560-5542

MATHEMATICA MOR AVICA Vol. 22, No. 2 (2018)

UNIVERSITY OF KRAGUJEVAC Faculty of Technical Sciences Čačak Mathematica Moravica

Editor-in-Chief Mališa Žižović, University of Kragujevac, Čačak Co-Editor-in-Chief Nada Damljanović, University of Kragujevac, Serbia Assciate Editors Praveen Agarwal, Anand International College of Engineering, Rajasthan, India Martin Bohner, Missouri University of Science and Technology, Rolla, USA İbrahim Çanak, Ege University, Izmir, Turkey Ivana D- olović, University of Belgrade, Serbia Jelena Ignjatović, University of Niš, Serbia Mahesh Joshi, Kumaun University, Nainital, India Karin Quaas, Leipzig University, Germany Shahram Rezapour, Azarbaijan Shahid Madani University, Tabriz, Iran Reza Saadati, Iran University of Science and Technology, Tehran, Iran Radmila Sazdanović, North Carolina State University, USA Deepa Sinha, South Asian University, Delhi, India Editors William O. Bray, Southwest Missouri State University, Springfield, USA Miroslav Ćirić, University of Niš, Serbia Dragan Djurčić, University of Kragujevac, Serbia Said Hanafi, Université de Valenciennes et du Hainaut-Cambrésis, France Shouchuan Hu, Southwest Missouri State University, Springfield, USA Miljan Knežević, University of Belgrade, Serbia Ljubiša Kočinac, University of Niš, Serbia Petronije S. Milojević, N.J. Institute of Technology, Newark, USA Gradimir Milovanović, University of Niš, Serbia Spasoje Mučibabić, University of Defense, Belgrade, Serbia Rajendra Prasad Pant, Kumaun University, Nainital, India Vladimir Rakočević, University of Niš, Serbia Marion Scheepers, Boise State University, Boise, Idaho, USA Marija Stanić, University of Kragujevac, Serbia Vera B. Stanojević, Southwest Missouri State University, Springfield, USA Milan R. Tasković, University of Belgrade, Serbia Kostadin Trenčevski, St. Cyril and Methodius University, Skopje, Macedonia Sree Hari Rao Vadrevu, Jawaharlal Nehru Technological University, Hyderabad, India Heiko Vogler, Technical University of Dresden, Germany Honorably Editors Stojan Bogdanović, University of Niš, Serbia Leon Hall, University of Missouri, Rolla, USA Milutin Obradović, University of Belgrade, Serbia Former Editors Roman Dwilewicz (1949-2016), University of Missouri, Rolla, USA Slavik V. Jablan (1952-2016), Mathematical Institute SANU, Belgrade, Serbia Časlav V. Stanojević (1928-2008), University of Missouri, Rolla, USA Administration and Production Mladen Janjić, University of Kragujevac, Serbia Katarina Pavlović, University of Kragujevac, Serbia Published by Faculty of Technical Sciences Čačak University of Kragujevac Corresponding address: Svetog Save 65, 32000 Čačak, Serbia E-mail address: [email protected] Web address: http://www.moravica.ftn.kg.ac.rs Mathematica Moravica Aims and Scope Mathematica Moravica presents original research papers in the fields of pure mathematics, applied mathematics and theoretical computer science.

Publication Frequency One volume, consisting of two issues, is published annually.

Instruction for Authors Papers to be considered for publication must be in English and prepared accor- ding to Journal Template (http://www.moravica.ftn.kg.ac.rs/instructions.html).

Submissions should be sent in PDF format to the Editorial Office via e-mail [email protected].

Authors warrant that their manuscripts are their original works, that they have not been published before, and are not under consideration for publication elsewhere.

Manuscripts are sent for review only if they pass the initial evaluation regarding their form and thematic scope.

Mathematica Moravica uses single-blind review system for all papers. Peer- reviewed articles support and embody the scientific method. It is therefore impor- tant to agree upon standards of expected ethical behavior of all parties involved in the act of publishing: the author, the journal editor, the peer reviewer, the publisher and the society.

The journal aims to apply very high standards in accepting papers for pu- blication and will publish results that are of significant interest. Papers dealing with applications will be limited to those that contain significant treatment of mathematics and not routine applications of mathematics.

Mathematica Moravica does not have any article processing charges nor article submission charges nor publication fee. Mathematica Moravica

Editor-in-Chief Mališa Žižović, University of Kragujevac, Čačak Co-Editor-in-Chief Nada Damljanović, University of Kragujevac, Serbia Assciate Editors Praveen Agarwal, Anand International College of Engineering, Rajasthan, India Martin Bohner, Missouri University of Science and Technology, Rolla, USA İbrahim Çanak, Ege University, Izmir, Turkey Ivana D- olović, University of Belgrade, Serbia Jelena Ignjatović, University of Niš, Serbia Mahesh Joshi, Kumaun University, Nainital, India Karin Quaas, Leipzig University, Germany Shahram Rezapour, Azarbaijan Shahid Madani University, Tabriz, Iran Reza Saadati, Iran University of Science and Technology, Tehran, Iran Radmila Sazdanović, North Carolina State University, USA Deepa Sinha, South Asian University, Delhi, India Editors William O. Bray, Southwest Missouri State University, Springfield, USA Miroslav Ćirić, University of Niš, Serbia Dragan Djurčić, University of Kragujevac, Serbia Said Hanafi, Université de Valenciennes et du Hainaut-Cambrésis, France Shouchuan Hu, Southwest Missouri State University, Springfield, USA Miljan Knežević, University of Belgrade, Serbia Ljubiša Kočinac, University of Niš, Serbia Petronije S. Milojević, N.J. Institute of Technology, Newark, USA Gradimir Milovanović, University of Niš, Serbia Spasoje Mučibabić, University of Defense, Belgrade, Serbia Rajendra Prasad Pant, Kumaun University, Nainital, India Vladimir Rakočević, University of Niš, Serbia Marion Scheepers, Boise State University, Boise, Idaho, USA Marija Stanić, University of Kragujevac, Serbia Vera B. Stanojević, Southwest Missouri State University, Springfield, USA Milan R. Tasković, University of Belgrade, Serbia Kostadin Trenčevski, St. Cyril and Methodius University, Skopje, Macedonia Sree Hari Rao Vadrevu, Jawaharlal Nehru Technological University, Hyderabad, India Heiko Vogler, Technical University of Dresden, Germany Honorably Editors Stojan Bogdanović, University of Niš, Serbia Leon Hall, University of Missouri, Rolla, USA Milutin Obradović, University of Belgrade, Serbia Former Editors CIP – Каталогизација у публикацији Roman Dwilewicz (1949-2016), University of Missouri, Rolla, USA Народна библиотека Србије, Београд Slavik V. Jablan (1952-2016), Mathematical Institute SANU, Belgrade, Serbia Časlav V. Stanojević (1928-2008), University of Missouri, Rolla, USA 51(058) Administration and Production Mladen Janjić, University of Kragujevac, Serbia ISSN 1450-5932 = Mathematica Moravica Katarina Pavlović, University of Kragujevac, Serbia COBISS.SR-ID 65361666 Published by Faculty of Technical Sciences Čačak University of Kragujevac Corresponding address: Svetog Save 65, 32000 Čačak, Serbia E-mail address: [email protected] Web address: http://www.moravica.ftn.kg.ac.rs

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