About this article
Published Online: Oct 03, 2018
Page range: 15 - 22
Received: Oct 26, 2017
Accepted: Feb 05, 2018
DOI: https://doi.org/10.21042/AMNS.2018.1.00002
Keywords
© 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