In this article, we study the existence of tripled coincidence and tripled common fixed point theorems in partially ordered complete quasi-metric spaces for nonlinear contraction condition related to Q-function q. Our results generalize and modify several comparable results in the literature. We also provide illustrative examples in support of our new results. Mathematics Subject Classification...

In [Coupled fixed points for a class of contractions in partially ordered spaces and applications, J. Comput. Anal. Appl. vol. 13, no. 6, (2011), 1123-1131], Jiandong Yin introduced the concept of a mixed g-comparable mapping F : X2 → X and proved coupled coincidence point theorems for a class of nonlinear contractive mappings. In this paper, we introduce the concept of a mixed g-comparable map...

In this paper, we study some tripled fixed and coincidence point theorems for two mappings F : X×X×X → X and g : X → X satisfying a nonlinear contraction based on φ-maps. Our results extend and improve many existing results in the literature. Also, we introduce an example to support the validity of our results.