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+//Caption:overall_gain
+// example 4.4.2
+//page 65
+syms a b c d e f g h
+// forward path denoted by P1,P2 and so on and loop by L1,L2 and so on 
+
+//path factor by D1,D2 and so on and graph determinant by D
+P1=a*b*c*d;
+P2=a*g;
+L1=f;
+L2=c*e;
+L3=d*h;
+//nontouching loops are  L1L2, L1L3
+L1L2=L1*L2;
+L1L3=L1*L3;
+D1=1;
+D2=1-L2;
+D=1-(L1+L2+L3)+(L1L2+L1L3);
+D=simple(D);
+Y=(P1*D1+P2*D2)/D;
+Y=simple(Y);
+disp(Y,"x5/x1");
+\ No newline at end of file