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+// chapter 3
+// example 3.17
+//page 150, figure 3.53
+Ri=%inf;Ro=0;
+Aol=%inf;
+Vb=0;//b is virtually ground
+Vout=1;// let us assume
+//input current of op-amp is zeroas R=%inf
+I1=(Vb-Vout)/100000
+If2=I1;
+Va=((10000)/(100000))*(Vb-Vout)
+//at node A Iin=I1+If1
+// (Vin-Va)/10*10^3=(Va-Vb)/10*10^3 + (Va-Vo)/100*10^3
+Vin=Va+(10000)*((Va/10000)+((Va-Vout)/100000));
+Ratio=Vout/Vin// result ratio of Vout/Vin
+\ No newline at end of file