About this article
Published Online: Apr 24, 2020
Page range: 23 - 32
Received: Jul 07, 2018
DOI: https://doi.org/10.2478/tmmp-2020-0002
Keywords
© 2020 Zul Amry, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Amry, Zul
Department of Mathematics, Faculty of Mathematics and Natural Sciences, State University of MedanMedan, Indonesia