QUADRUPLE COMMON FIXED POINT THEOREMS FOR w-COMPATIBLE MAPPINGS IN ORDERED CONE METRIC SPACES

It establishes quadruple coincidence point theorems for g-monotone mappings and quadruple common fixed point theorems for w-compatible mappings and proves the existence and uniqueness of quadruple common fixed points for nonlinear contractive mappings in a partially ordered cone metric space with a cone P having nonempty interior. The results of this paper extend and generalize several well known corresponding results in partially ordered cone metric spaces.