Coupled coincidence point theorems for nonlinear contractions under (F,g) invariant set in cone metric spaces

We extend the recent results of coupled coincidence point theorems of Shatanawi et. al. (2012) by weakening the concept of mixed g-monotone property. We also give an example of a nonlinear contraction mapping, which is not applied to the existence of coupled coincidence point by the results of Shatanawi et. al. but can be applied to our results. The main results extend and unify the results of Shatanawi et. al. and many results of the coupled xed point theorems of Sintunavarat et. al. (2012).