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+//Page Number: 454
+//Example 9.4
+clc;
+//Given
+S11=0.89;
+S12=0.02;
+S21=3.1;
+S22=0.78;
+
+del=(S11*S22)-(S12*S21);
+K=[1-(S11)^2-(S22)^2+(del)^2;]/(2*S12*S21);
+if(K<1)
+    disp('Amplifier is potentially unstable');
+else
+     disp('Amplifier is potentially stable');
+     end
+