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Erratum to: Some new theorems of expanding mappings without continuity in cone metric spaces
Fixed Point Theory and Applications volume 2014, Article number: 178 (2014)
Abstract
In this note we correct some errors that appeared in the article (Han and Xu in Fixed Point Theory Appl. 2013:3, 2013) by modifying some conditions in the main theorems and corresponding corollaries.
MSC:47H10, 54H25.
Correction
Upon critical examination of the main results and their proofs in [1], we note several critical errors in the conditions of the main theorems in [1]. These errors lead to subsequent errors in the corresponding corollaries in [1].
In this note, we would like to supplement several conditions, which are used in their proofs but not referred to in the conditions of the main results, to achieve our claim.
The following theorem is a modification to [[1], Theorem 2.1]. The proof is the same as that in [1]. We will attain the desired goal by adding two conditions to that in [[1], Theorem 2.1]. We state that Theorem 2.1 in [1] is replaced by the following theorem.
Theorem 2.1 Let (X,d) be a complete cone metric space. Suppose that the mapping f:X\to X is onto and such that
for all x,y\in X, where {a}_{i} (i=1,2,3,4,5) satisfy {a}_{2}\ge 0, {a}_{4}\ge 0, {a}_{1}+{a}_{2}+{a}_{3}>1 and {a}_{3}\le 1+{a}_{4}. Then f has a fixed point.
Remark 2.1 Compared to Theorem 2.1 in [1], Theorem 2.1 mentioned above possesses the conditions {a}_{2}\ge 0 and {a}_{4}\ge 0 while, unluckily, Theorem 2.1 in [1] does not. The reason for supplementing these conditions is the fact that in the proof of [[1], Theorem 2.1] we have used the conditions {a}_{2}\ge 0 and {a}_{4}\ge 0 to ensure that the two deductions

(i)
d({x}_{n+1},{x}_{n1})\ge d({x}_{n+1},{x}_{n})d({x}_{n1},{x}_{n}) implies {a}_{4}d({x}_{n+1},{x}_{n1})\ge {a}_{4}d({x}_{n+1},{x}_{n}){a}_{4}d({x}_{n1},{x}_{n})
and

(ii)
d(p,q)\ge d(p,{x}_{n+1})d(q,{x}_{n1}) implies {a}_{2}d(p,q)\ge {a}_{2}d(p,{x}_{n+1}){a}_{2}d(q,{x}_{n1})
must be valid.
Similarly, the following theorem is a modification to [[1], Theorem 2.5]. The proof is the same as that in [1]. We state that Theorem 2.5 in [1] is replaced by the following theorem.
Theorem 2.5 Let (X,d) be a complete cone metric space. Suppose the mappings f,g:X\to X are onto and satisfy
for all x,y\in X, where {a}_{i} (i=1,2,3,4,5) satisfy {a}_{3}\ge 0, {a}_{5}\ge 0, {a}_{1}+{a}_{2}+{a}_{3}>1 and {a}_{2}\le 1+{a}_{5}, {a}_{3}\le 1+{a}_{4}. Then f and g have a common fixed point.
Accordingly, the following two corollaries are modifications to Corollary 2.2 and Corollary 2.6 in [1], and we state that the latter corollaries are replaced by the former ones, respectively.
Corollary 2.2 Let (X,d) be a complete cone metric space. Suppose the mapping f:X\to X is onto and such that
for all x,y\in X, where p\le 1, l\ge 0 and k+l+p>1. Then f has a fixed point.
Corollary 2.6 Let (X,d) be a complete cone metric space. Suppose the mappings f,g:X\to X are onto and such that
for all x,y\in X, where \beta \ge 0, \gamma \ge 0, \beta \le 1+\gamma and \alpha +2\beta >1. Then f and g have a common fixed point.
References
Han Y, Xu S: Some new theorems of expanding mappings without continuity in cone metric spaces. Fixed Point Theory Appl. 2013., 2013: Article ID 3
Acknowledgements
The research is partially supported by the PhD Startup Fund of Hanshan Normal University, Guangdong Province, China (No. QD20110920).
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The online version of the original article can be found at 10.1186/1687181220133
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Xu, S., Cheng, S. & Han, Y. Erratum to: Some new theorems of expanding mappings without continuity in cone metric spaces. Fixed Point Theory Appl 2014, 178 (2014). https://doi.org/10.1186/168718122014178
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DOI: https://doi.org/10.1186/168718122014178
Keywords
 cone metric space
 expanding mapping
 common fixed point