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Publicado en línea: 24 abr 2020
Páginas: 23 - 32
Recibido: 07 jul 2018
DOI: https://doi.org/10.2478/tmmp-2020-0002
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© 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