initial commit / add all books

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diff --git a/75/CH9/EX9.11/ex_11.sce b/75/CH9/EX9.11/ex_11.sce
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+        //    PG (613)
+
+A = [4 1 1;1 4 1;1 1 4]
+w1 = [0.985599 0.119573 0.119573]'
+P1 = eye() - 2*w1*w1'
+A2 = P1*A
+w2 = [0 0.996393 0.0848572]'
+P2 = eye() - 2*w2*w2'
+R = P2*A2
+Q = P1*P2
+Q*R
+
+//    A = Q * R
+
+abs(det(A))
+abs(det(Q)*det(R))
+
+//    |det(A)| = |det(Q)*det(R)| = |det(R)| = 54 (approx) 
+
+lam = spec(A)'
+lam1 = lam(1,1)
+lam2 = lam(1,2)
+lam3 = lam(1,3)
+lam1 * lam2 * lam3
+
+//    Product of eigen values also comes out to be 54
+