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+//Caption:to_find_various_signal_flow_graph_parameter
+// example 4.4.3
+//page 66
+syms a b c d e f g h ij
+// 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
+//six independent path
+P1=a*b*d
+P2=e*f*h
+P3=a*j*h
+P4=e*i*d
+P5=-e*i*c*j*h
+P6=-a*j*g*i*d
+//3 INDIVIDUAL LOOPS
+L1=-b*c
+L2=-f*g
+L3=-i*c*j*g
+//NON TOUCHING LOOPS
+L1L2=L1*L2
+//PATH FACTORS
+D3=1;D4=1;D5=1;D6=1
+D1=1-L2
+D2=1-L1
+//GRAPH DETERMINANT
+D=1-(L1+L2+L3)+(L1L2);
+D=simple(D)
+disp(D,"graph_determinant=")
+\ No newline at end of file