||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
G1 = DiGraph({1:[2,3,4],3:[1]})
G1.plot()
G1.adjacency_matrix()
}}}

/* code_ends */

 * '''Solution by''': 
   * <sri valli>, <student>, <SNIST>