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• Department of Mathematics, Faculty of Arts and Science, Namik Kemal University, 59030, Tekirda˘g, Turkey and Department of Mathematics Engineering, Istanbul Tech- nical University, Maslak, 34469 Istanbul, Turkey
• E-mail address: erdogan.math@gmail.com
• Department of Mathematics Education, Faculty of Education, Recep Tayyip Erdogan University, Rize, Turkey
• E-mail address: azadbay@gmail.com
• Faculty of Economics, Administrative and Social Sciences, Hasan Kalyoncu Univer- sity, 27410 Gaziantep, Turkey
• E-mail address: mtsrkn@hotmail.com
• Department of Mathematics, University of Gaziantep, Gaziantep 27310, Turkey
• E-mail address: acikgoz@gantep.edu.tr