On Fenchel c-conjugate dual problems for DC optimization: characterizing weak, strong and stable strong duality

In this paper we present two Fenchel-type dual problems for a DC (difference of convex functions) optimization primal one. They have been built by means of the c-conjugation scheme, a pattern of conjugation which has been shown to be suitable for evenly convex functions. We study characterizations of weak, strong and stable strong duality for both pairs of primal-dual problems. We also give conditions which relate the existence of strong and stable strong duality for both pairs.