where C, the abscissa of convergence, is a real constant and is chosen larger than the real parts of all singular points of F(s). Thus, the path of integration is parallel to the S axis and is displaced by the amount C from it. This path of integration is to the right of all singular points. Evaluating the inversion integral appears complicated. In practice, we seldom use this integral for finding S. There are simpler methods for finding S. we shall discuss such simpler methods in Section 2-5