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+//page 199
+//Example 6.9
+clc;
+clear;
+close;
+disp('T is the linear operator on R^2 represented in standard order basis by matrix:');
+A = [0 -1;1 0];
+disp(A,'A = ');
+disp('Then invariant subspaces of R^2 under T are R^2 and zero subspace');
+disp('If W is invariant subspace spanned by non zero vector ''a'' means ''a'' is characteristic vector');
+disp('But, A has no characteristic values');
+disp('When W is invariant under T, T induces a linear operator Tw on W that is defined by');
+disp('Tw(a) = T(a)');
+//end