//page 18
//Example 1.11
clear;
close;
clc;
disp('I = m * m identity matrix');
disp('A = m * n matrix');
disp('I*A = A','Then,');
disp('A * I = A');
disp('0(k,m) = k * m zero matrix');
disp('0(k,m) = 0(k,m) * A','Then,');
disp('And, A*0(k,m) = 0(k,m)');
//end