| Affiliation: | 1. Department of Mathematics Education, Chungbuk National University, Cheongju 361-763, South Korea;2. Department of Mathematics, University of Queensland, Brisbane 4072, Australia;1. Department of Mathematics Education, Chungbuk National University, Cheongju 361-763, South Korea;2. Division of Liberal Arts, Korea University of Technology and Education, Chunan 330-708, South Korea;1. Department of Mathematics, Guizhou University, Guiyang, Guizhou 550025, China;2. Department of Mathematics, Wuhan Institute of Science and Technology, Hubei 310027, China;3. Department of Mathematics, Zhejiang University, Hangzhou, Zhejiang 310027, China;1. Department of Communication, 359 Baldy Hall, University at Buffalo, Buffalo, NY 14260, USA;2. Department of Communication, School of Arts and Sciences, Barry University, 11300 NE 2nd Avenue, Miami Shores, FL 33161-6695, USA;1. Department of Mathematics and Computer Science, Illinois Wesleyan University, Bloomington, IL 61702-2900, USA;2. Department of Mathematics, Catholic University of America, Washington, DC 20064, USA;3. Gayatri Vidya Parishad Institute for Advanced Studies, Visakhapatnam, India |
