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

/* code_begins */

{{{
# Example 1 -  Page 402
P = vector([4,0,2])
Q = vector([6,-1,2])
a = Q - P
print a
}}}

/* code_ends */

 * '''Solution by''': 
   * Ragupathy, Teacher, Ramakrishna Mission Vidyalaya
   * Venkata Ramana, Teacher, Ramakrishna Mission Vidyalaya