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A unique common fixed point theorem for four maps in cone metric spaces. (English) Zbl 1242.54029
A proof is given of a unique common fixed point result for four mappings acting in a cone metric space (in the sense of L.-G. Huang and X. Zhang [J. Math. Anal. Appl. 332, No. 2, 1468–1476 (2007; Zbl 1118.54022)]) over a normal cone. The contractive condition is of the Hardy-Rogers type. No examples are given.
MSC:
54H25Fixed-point and coincidence theorems in topological spaces
47H10Fixed point theorems for nonlinear operators on topological linear spaces