Common Fixed Points of Generalized Contractive Hybrid Pairs in Symmetric Spaces
© M. Abbas and A. R. Khan. 2009
Received: 16 April 2009
Accepted: 10 November 2009
Published: 3 December 2009
Several fixed point theorems for hybrid pairs of single-valued and multivalued occasionally weakly compatible maps satisfying generalized contractive conditions are established in a symmetric space.
1. Introduction and Preliminaries
In 1968, Kannan  proved a fixed point theorem for a map satisfying a contractive condition that did not require continuity at each point. This paper was a genesis for a multitude of fixed point papers over the next two decades. Sessa  coined the term weakly commuting maps. Jungck  generalized the notion of weak commutativity by introducing compatible maps and then weakly compatible maps . Al-Thagafi and Shahzad  gave a definition which is proper generalization of nontrivial weakly compatible maps which have coincidence points. Jungck and Rhoades  studied fixed point results for occasionally weakly compatible (owc) maps. Recently, Zhang  obtained common fixed point theorems for some new generalized contractive type mappings. Abbas and Rhoades  obtained common fixed point theorems for hybrid pairs of single-valued and multivalued owc maps defined on a symmetric space (see also ). For other related fixed point results in symmetric spaces and their applications, we refer to [10–15]. The aim of this paper is to obtain fixed point theorems involving hybrid pairs of single-valued and multivalued owc maps satisfying a generalized contractive condition in the frame work of a symmetric space.
A set together with a symmetric is called a symmetric space.
We will use the following notations, throughout this paper, where is a symmetric space, and , and is the class of all nonempty bounded subsets of The diameter of is denoted and defined by
Clearly, For and we write and respectively. We appeal to the fact that if and only if for
Recall that is called a coincidence point (resp., common fixed point) of and if (resp., ).
Maps and are said to becompatible if for each and whenever is a sequence in such that ( ) and for some .
Maps and are said to be weakly compatible if whenever
Maps and are said to be owc if and only if there exists some point in such that and
- (a)Define and as: and(1.3)
- (b)Define by(1.4)
It can be easily verified that is coincidence point of and but and are not weakly compatible there, as . Hence and are not compatible. However, the pair is occasionally weakly compatible, since the pair is weakly compatible at
Assume that satisfies the following.
(i) and for each .
(ii) is nondecreasing on
Define, satisfies above
Let satisfy the following.
(iii) for each .
(iv) is nondecreasing on
Define, satisfies above
For some examples of mappings which satisfy we refer to .
2. Common Fixed Point Theorems
In the sequel we shall consider, which is defined on where stands for a real number to the left of and assume that the mapping satisfies above.
then , and have a unique common fixed point.
which is a contradiction and the claim follows. Similarly, we obtain Thus , and have a common fixed point. Uniqueness follows from (2.1).
and , then have a unique common fixed point.
Since (2.7) is a special case of (2.1), the result follows from Theorem 2.1.
where and Then , and have a unique common fixed point.
So, (2.9) is a special case of (2.1) and hence the result follows from Theorem 2.1.
Then and have a unique common fixed point.
Condition (2.12) is a special case of condition (2.1) with and Therefore the result follows from Theorem 2.1.
where , and , then and have a unique common fixed point.
which is a contradiction, and hence the claim follows. Similarly, we obtain Thus , and have a common fixed point. Uniqueness follows easily from (2.14).
Define such that
) is nondecreasing in the 4th and 5th variables,
for all for which where then , and have a unique common fixed point.
which, from and implies that this further implies that Hence the claim follows. Similarly, it can be shown that which proves that is a common fixed point of , and . Uniqueness follows from (2.21) and ( ).
A control function is a continuous monotonically increasing function that satisfies and, if and only if
Let be such that for each
then , and have a unique common fixed point.
which is a contradiction. Therefore which further implies that Hence the claim follows. Similarly, it can be shown that which proves the result.
Set is continuous and nondecreasing mapping with if and only if
The following theorem generalizes [16, Theorem ].
for all , for which right-hand side of (2.30) is not equal to zero where then , and have a unique common fixed point.
which is a contradiction, and hence the claim follows. Similarly, it can be shown that which, proves that is a common fixed point of , and . Uniqueness follows easily from (2.30).
Note that is symmetric but not a metric on .
Clearly, but and but they show that is not weakly compatible. On the other hand, gives that Hence is occasionally weakly compatible. Note that , , , and they imply that is not weakly compatible Now gives that . Hence is occasionally weakly compatible. As and so is the unique common fixed point of , and
Remark 2.10 s.
Weakly compatible maps are occasionally weakly compatible but converse is not true in general. The class of symmetric spaces is more general than that of metric spaces. Therefore the following results can be viewed as special cases of our results:
(d)[28, Theorem ] becomes special case of Corollary 2.4.
The authors are thankful to the referees for their critical remarks to improve this paper. The second author gratefully acknowledges the support provided by King Fahad University of Petroleum and Minerals during this research.
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