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

/* code_begins */

{{{
print"A*B is a null matrix does not necessarily imply A=0 or B=0 or B*A=0"
var('A,B')  #initializing two matrices
A=matrix([[1,1],[2,2]])
B=matrix([[-1,1],[1,-1]])
print A
print B
print A*B   # multipling A and B in this order
print B*A   # multipling B and A in this order
}}}

/* code_ends */

 * '''Solution by''': 
   * Kiran Kumar Thota, Student, IIIT-H