À propos de cet article
Publié en ligne: 23 oct. 2017
Pages: 443 - 448
Reçu: 06 avr. 2017
Accepté: 23 oct. 2017
DOI: https://doi.org/10.21042/AMNS.2017.2.00035
Mots clés
© 2017 A.T. El-Dessouky, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
El-Dessouky, A. T.
Department of Mathematics, Faculty of Science, Helwan UniversityCairo, Egypt