.PS cct_init # Usual defs... qrt=dimen_/4; hlf=dimen_/2; dim=dimen_; {move down_ hlf; "$v_i$"} dot; line; dot resistor(down_); llabel(,R_1,) move left_; dot line right_ 3*dim; dot move left_ ; dot consource(up_,V); rlabel(,-\left(\frac{R_2}{R_1}\right)v_i,) line right_; dot "\tiny InvertEquiv" at (3*dimen_, -1.5*dimen_) rjust_ .PE