The modules of a digraph,
Basic properties of prime digraphs,
,Prime subdigraphs in a prime digraph,
Prime digraphs which are minimal for a vertex subset
The main purpose for this course is to introduce :
1- Basic counting principles,
2- Generating functions,
3- Recurrence relations,
4- Basic concepts in graph theory,
5- Some classes of graphs,
6- Coloring of graphs.