Approximation and Complementary Geometric Programming

The note shows that a system for condensing posynomials with more than one term into single-termed posynomials, proposed recently by Avriel and Williams, is a special case of an approximation technique originally put forward by Dufhn, Peterson and Zener. It is also shown that the latter approximation scheme has a more general application and the difference between the two is demostrated by a small example.