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+//page 36
+//Example 2.7
+clear;
+clc;
+close;
+disp('A = m*n matrix over field F');
+disp('X and Y are n*1 matrices over F');
+disp('A*X = 0, A*Y = 0');
+disp('c is a scalar')
+disp('So, A(cX+Y) = c*A*X + A*Y = 0');
+disp('Hence, the set of all n*1 column matrices is the subspace of space of all n*1 matrices over F');
+//end