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Publicado en línea: 03 oct 2018
Páginas: 15 - 22
Recibido: 26 oct 2017
Aceptado: 05 feb 2018
DOI: https://doi.org/10.21042/AMNS.2018.1.00002
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© 2018 Farhad Khellat and Mahmud Beyk Khormizi, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Khellat, Farhad
Department of mathematics, Faculty of mathematical sciences, Shahid Beheshti UniversityTehran, Iran
Khormizi, Mahmud Beyk
Department of mathematics, Faculty of mathematical sciences, Shahid Beheshti UniversityTehran, Iran
