Fixed Point Theorems in Three Metric Spaces

Let (X,d1), (Y, d2) and (Z, d3) be complete metric spaces. If T: X → Y,R: Y → Z, S: Z → X are three mappings satisfying the inequalities (4), (5) and (6), then SRT has a unique fixed point a ∈ X, TSR has a unique fixed point b ∈ Y and RTS has a unique fixed point c ∈ Z. Further, Ta = b,Rb = c and Sc = a. This result extends the result of S. Č. Nešić[1] from two metric spaces to three metric spaces, and also, it generalizes the results of B. Ficher [2] and V. Popa [3] and extends them from two metric spaces to three metric spaces