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

/* code_begins */

{{{
print" if A*C=A*D doesn't necessarily imply C=D(even when A!=0)"
var('A,C,D')  #initializing three matrices
A=matrix([[1,1],[2,2]])
C=matrix([[2,1],[2,2]])
D=matrix([[3,0],[1,3]])
print A
print C
print D
print A*C  # multipling A and C in this order
print A*D  # multipling A and D in this order
}}}

/* code_ends */

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