Authors
Fatima Hamani
Department of mathematics, University of M’sila, M’sila, ALGERIA
Azedine Rahmoune
Department of mathematics, University of Bordj Bou Arreridj, El Anasser, ALGERIA
© 2022 Fatima Hamani, Azedine Rahmoune, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.