||'''Book'''|| Linear Algebra ||
 ||'''Author'''|| Gilbert Strang ||
 ||'''Edition'''||  ||

/* code_begins */

{{{
b=matrix([[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]])
d=4*b
d
c=matrix([[1,1,1,1],[1,1,1,1],[1,1,1,1],[1,1,1,1]])
c
A=d-c;A
A*matrix([[1],[1],[1],[1]])
}}}

/* code_ends */

 * '''Solution by''': 
   * <prasad>, <student>, <Organization>
   * <Your Name>, <Profession>, <Organization>