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diff --git a/75/CH7/EX7.3/ex_3.sce b/75/CH7/EX7.3/ex_3.sce
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index 000000000..43d4a0fe9
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+        //    PG (477)
+
+A = [2 1 0;1 3 1;0 1 2]
+lam = spec(A)'
+lam1 = lam(1,1)
+lam2 = lam(1,2)
+lam3 = lam(1,3)
+//    Orthonomal Eigen vectors
+
+u1 = (1/sqrt(3))*[1;-1;1]
+u2 = (1/sqrt(2))*[1;0;-1]
+u3 = (1/sqrt(6))*[1;2;1]
+
+
+