1. Professor, Dept. of Mathematics, Faculty of Science, Zagazig Univ., P.O. Box 44519, Zagazig, Egypt (corresponding author).
2. Dept. of Mathematics, Faculty of Science, Zagazig Univ., P.O. Box 44519, Zagazig, Egypt.
3. Professor, Dept. of Mathematics Engineering of Physics, Higher Institute of Engineering, Shorouk Academy, El-Shorouk 11837, Egypt.
4. Dept. of Mathematics Engineering of Physics, Higher Institute of Engineering, Shorouk Academy, El-Shorouk 11837, Egypt.