... thank one of the reviewers for suggesting the inclusion of a concrete example towhich Theorem 3.3 applies. They acknowledge the support of the Spanish Ministry of Science and Innovation, Grant ... point theorem 2, the Ekeland variation principle 3 and the nonconvexminimization theorem 4,forw-distances. Recently, Al-Homidan et al. introduced in 5 the notion of Q-function on a quasimetric ... aquasimetric on X,thepairX, d is then called a quasimetric space.Given a T0qpm d on a set X, the function d−1defined by d−1x, ydy, x,isalso a T0qpm on X, called the conjugate of d,andthefunctiondsdefined...