Abstract
In this paper we obtain existence and uniqueness results for quadruple fixed points of operators $F: X^4 \rightarrow X$. We also give some examples to support our results.
Citation
Vasile Berinde. Erdal Karapinar. "Quadruple fixed point theorems for nonlinear contractions in partially ordered metric spaces." Banach J. Math. Anal. 6 (1) 74 - 89, 2012. https://doi.org/10.15352/bjma/1337014666
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