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Coincidence and common fixed point theorems for Suzuki type hybrid contractions and applications
Fixed Point Theory and Applications volume 2014, Article number: 147 (2014)
Abstract
Coincidence and common fixed point theorems for a class of Suzuki hybrid contractions involving two pairs of single-valued and multivalued maps in a metric space are obtained. In addition, the existence of a common solution for a certain class of functional equations arising in a dynamic programming is also discussed.
MSC:47H10, 54H25.
1 Introduction
Consistent with [1] (see also [2]), Y denotes an arbitrary nonempty set, a metric space and (resp. ), the collection of all nonempty closed (resp. closed bounded) subsets of X. The hyperspace (resp. ) is called the generalized Hausdorff (resp. the Hausdorff) metric space induced by the metric d on X.
For nonempty subsets A, B of X, denotes the gap between the subsets A and B, while
As usual, we write (resp. ) for (resp. ) when .
For the sake of brevity, we choose the following notations, wherein S, T, f, and g are maps to be defined specifically in a particular context, while x and y are elements of some specific domain:
Let denote the class of all nonempty closed bounded subsets of X.
A map is called a Nadler multivalued contraction if there exists such that, for every , .
The classical multivalued contraction theorem due to Nadler [1] states that Nadler multivalued contraction on a complete metric space X has a fixed point in X, that is, there exists such that . For a detailed discussion of this theorem on generalized Hausdorff metric spaces and applications, one may refer to [3–13], and [14].
Nadler’s multivalued contraction theorem [1] has led to a rich fixed point theory for multivalued maps in nonlinear analysis (see, for instance [6, 9–12, 15–22], and [13, 14, 23, 24]). It has various applications in mathematical sciences (see, for instance, [2, 5, 7–9], and [25]).
The following important result involving two pairs of hybrid maps on an arbitrary nonempty set with values in a metric space is due to Singh and Mishra [12] (see also [21]).
Theorem 1.1 Let and be such that and and one of , , or is a complete subspace of X. Assume there exists such that, for every ,
Then
-
(i)
S and f have a coincidence point v in Y;
-
(ii)
T and g have a coincidence point w in Y.
Further, if , then
-
(iii)
S and f have a common fixed point v provided that fv is a fixed point of f, and f and S commute at v;
-
(iv)
T and g have a common fixed point w provided that gw is a fixed point of g, and g and T commute at w;
-
(v)
S, T, f, and g have a common fixed point provided that (iii) and (iv) both are true.
The following result due to Kikkawa and Suzuki [26] (see also [13, 14]) generalizes Nadler’s multivalued contraction theorem.
Theorem 1.2 Let X be a complete metric space and . Assume there exists such that, for every ,
implies
Then T has a fixed point in X.
Subsequently, some interesting extensions and generalizations of Theorem 1.2 have recently been obtained among others by Abbas et al. [27], Dhompongsa and Yingtaweesittikul [18], Doric̀ and Lazovic̀ [28], Kamal et al. [29], Moţ and Petruşel [19], Singh and Mishra [13, 14] and Singh et al. [10, 30], and [23].
The importance of Suzuki contraction theorem [[24], Theorem 2], Theorem 1.2 and subsequently obtained coincidence and fixed point theorems (cf. [13, 14, 18, 19, 23, 26–28], and others) for maps in metric spaces satisfying Suzuki type contractive conditions is that the contractive conditions are required to be satisfied not for all points of the domain. For example, the condition (1.1) of Theorem 1.2 puts some restrictions on the domain of the map T.
In all that follows, we take a nonincreasing function φ from onto defined by
Recently, Singh et al. [10] obtained the following coincidence and common fixed point theorem which generalizes a result of Doric̀ and Lazovic̀ [28] and some other results from [3, 26], and [21].
Theorem 1.3 Let and be such that and . Assume there exists such that, for every ,
implies
If one of , or is a complete subspace of X, then there exists a point such that .
Further, if , and fz is a fixed point of f, then fz is common fixed point of S and T provided that f is IT (Itoh-Takahashi)-commuting [13]with S and T at z.
Now a natural question arises whether Theorem 1.1 can further be generalized. In this paper, we answer this question affirmatively under tight minimal conditions. Our main result (Theorem 2.2) also presents an extension of Theorem 1.3 for a quadruplet of maps. Some recent results are discussed as special cases. Further, using two corollaries of the main result (Theorem 2.2), we obtain other common fixed point theorems for multivalued and single-valued maps on metric spaces. We also deduce the existence of common solution for a certain class of functional equations arising in dynamic programming. Examples are given to justify applications.
2 Main results
The following definition is due to Itoh and Takahashi [31] (see also [13]).
Definition 2.1 Let and . Then the hybrid pair is IT-commuting at if .
Evidently a pair of commuting multivalued map and a single-valued map are IT-commuting but the reverse implication is not true [[32], p.2]. However, a pair of single-valued maps are IT-commuting (also called weakly compatible by Jungck and Rhoades [33]) at if when .
We shall need the following lemma, essentially due to Nadler [1] (see also [3], [[2], p.61], [[9], p.76].
Lemma 2.1 If and , then for each , there exists such that .
Let denote the collection of all coincidence points of S and f, that is, when and ; and when . The following is the main result of this section.
Theorem 2.2 Let and be such that and . Assume there exists such that, for every ,
implies
If one of , , or is a complete subspace of X, then
-
(I)
is nonempty, i.e. there exists a point such that ;
-
(II)
is nonempty, i.e. there exists a point such that .
Furthermore, if , then
-
(III)
S and f have a common fixed point provided that the maps S and f are IT-commuting just at coincidence point z and fz is fixed point of f;
-
(IV)
T and g have a common fixed point provided that the maps T and g are IT-commuting just at coincidence point and is fixed point of g;
-
(V)
S, T, f, and g have a common fixed point provided that both (III) and (IV) are true.
Proof Without loss of generality, we may take and f, g non-constant maps.
Let be such that . We construct two sequences and in Y as follows.
Let and . By Lemma 2.1, there exists such that
Similarly, there exists such that
Continuing in this manner, we find a sequence in Y such that
and
Now, we show that, for any ,
Suppose if , then
Therefore by the assumption,
This yields (2.1). Suppose if , then
Therefore by the assumption,
yielding (2.1). So, in both cases we obtain (2.1). In an analogous manner, we show that
We conclude from (2.1) and (2.2) that, for any ,
Therefore the sequence is Cauchy. Assume that the subspace is complete. Notice that the sequence is contained in and has a limit in . Call it u. Let . Then and . The subsequence also converges to u. Let . Then
Now we show that, for any ,
and for any ,
Since , there exists (natural numbers) such that
Also , there exists such that
Then as in [[24], p.1862] (see also [28]),
Therefore
Now, either or .
In either case, by (2.6) and the assumption,
Making ,
that is, .
This yields (2.4), that is,
Analogously, we can prove (2.5), that is,
Now, we show that is nonempty.
First we consider the case .
Suppose . Then as in [[18], p.6], let be such that .
Since implies , we have from (2.4) and (2.5),
On the other hand, since ,
Therefore, by the given assumption,
This gives .
So by (2.7), .
Therefore,
This contradicts . Consequently , and is nonempty.
In an analogous manner, we can prove in the case that is nonempty.
Now we consider the case .
We first show that
Assume that . Then for every , there exists such that
Therefore
So, using (2.5), the inequality (2.8) implies
If , then (2.9) gives
Making ,
Thus
Then
and by the assumption,
If , then (2.9) gives
that is, .
Making ,
Then , and by the assumption, we get (2.10).
Now taking in (2.10) and passing to the limit, we obtain .
This gives , that is, z is a coincidence point of f and S. Analogously, . Thus (I) and (II) are completely proved.
Further, if , and fz is a fixed point of f, and S and f are IT-commuting at z, then . Therefore, implies , so . This proves that is a common fixed point of f and S. Therefore (2.3) implies that u is a common fixed point of f and S. This proves (III). Analogously, T and g have a common fixed point . Therefore (2.3) implies that u is a common fixed point of T and g. This proves (IV). Now (V) is immediate. □
Remark 2.1 In Theorem 2.2, the hypothesis ‘fz is a fixed point of f’ is essential for the existence of a common fixed point of S and f (see [22, 34] and the following example). Similarly, the hypothesis ‘ is a fixed point of g’ is essential for the existence of a common fixed point of T and g.
Example 2.3 Let (nonnegative reals) be endowed with the usual metric. Define for , , , and . Then , and all other hypotheses of Theorem 2.2 with are satisfied for . Notice that , where . Thus g and T have a coincidence at , but is not a fixed point of g and hence not a common fixed point of g and T. Note that is a coincidence point of f and S, and , that is, f and S are IT-commuting at z. Evidently, is a common fixed point of f and S.
The following result due to Singh et al. [35] extends and generalizes certain results of [10, 12, 26] and others.
Corollary 2.4 Let and be such that . Assume there exists such that, for every ,
implies
If one of , or is a complete subspace of X, then
-
(I)
is nonempty, i.e. there exists a point such that ;
-
(II)
is nonempty, i.e. there exists a point such that .
Furthermore, if , then
-
(III)
S and f have a common fixed point provided that the maps S and f are IT-commuting just at coincidence point z and fz is fixed point of f;
-
(IV)
S and g have a common fixed point provided that the maps S and g are IT-commuting just at coincidence point and is fixed point of g;
-
(V)
S, f, and g have a common fixed point provided that both (III) and (IV) are true.
Proof It follows from Theorem 2.2 when . □
We remark that in general the coincidence points z and guaranteed by Theorem 2.2 or Corollary 2.4 may be different. However, if we take in Theorem 2.2, the maps S, T, and f have a common coincidence point. So we have a slightly sharp result.
Corollary 2.5 Theorem 1.3.
Proof It follows from Theorem 2.2 when . □
The following result extends and generalizes certain results of [28, 36] and others.
Corollary 2.6 [23]
Let X be a complete metric space and . Assume there exists such that, for every ,
Then there exists an element such that .
Proof It follows from Theorem 2.2 when and f and g are the identity maps on . □
The following result due to Doric̀ and Lazovic̀ [28] generalizes many fixed point theorems from [13, 26] and [37].
Corollary 2.7 Let X be a complete metric space and . Assume there exists such that, for every ,
Then there exists an element such that .
Proof It follows from Theorem 2.2 when , , and f, g are the identity maps on X. □
The following result extends a common fixed point theorem of [[10], Theorem 2.8].
Corollary 2.8 Let be such that , , and one of or or or is complete subspace of X. Assume there exists such that, for every ,
implies
Then and are nonempty. Further, if , and if f, g, P, and Q are commuting at a common coincidence point, then f, g, P, and Q have a unique common fixed point, that is, there exists a unique point such that .
Proof Set and for every . Then it easily comes from Theorem 2.2 that and are nonempty. Furthermore, if and f and g commute, respectively, with P and Q at z, then , , , and .
Also , and this implies
This says that fz is fixed point of f and P. Analogously gz is fixed point of g and Q. The uniqueness of the common fixed point follows easily. □
The following result extends and generalizes coincidence and common fixed point theorems of Goebel [38], Jungck [39], Fisher [40], and others.
Corollary 2.9 [35]
Let be such that . Let or or be a complete subspace of X. Assume there exists such that, for every ,
implies
Then and are nonempty. Further, if and if P commutes with f and g at a common coincidence point, then f, g, and P have a unique common fixed point, that is, there exists a unique point such that .
Proof It follows from Corollary 2.8 when . □
Corollary 2.10 Let be a complete metric space and be onto maps. Assume there exists such that, for every ,
Then f and g have a unique common fixed point.
Proof It follows from Corollary 2.8 when and P, Q both are the identity maps on X. □
Corollary 2.11 Let be a complete metric space and be an onto map. Assume there exists such that, for every ,
Then f has a unique fixed point.
Proof It follows from Corollary 2.10 when . □
The following example shows that Theorem 2.2 is indeed more general than Theorem 1.1.
Example 2.12 Consider a metric space , where d is defined by
Let S, T, f and be such that
and
Then S, T, f, and g do not satisfy the assumption in Theorem 1.1 at , or at , . However,
if and .
Since at , .
Here we note that the value of r is , so by definition, , so .
Thus S, T, f, and g satisfy the assumption of Theorem 2.2 (and also Corollary 2.8).
In the following example, we show that two multivalued maps and two single-valued maps satisfy all the hypotheses of Theorem 2.2 to ensure common coincidence points of pairwise maps.
Example 2.13 Let and . Let d be the usual metric on X, and S, T, f, and g be defined on Y with values in X as
and
Notice that and . Further, all other conditions of Theorem 2.2 are readily verified with and . Evidently, , , , and , , . Moreover, .
Now we give an application of Corollary 2.8.
Theorem 2.14 Let and be such that , , and let one of , , or be a complete subspace of X. Assume there exists such that, for every ,
implies
Then and are nonempty.
Proof Choose . Define single-valued maps as follows. For each , let be a point of Sx which satisfies
Similarly, for each , let be a point of Ty such that
Since and ,
So (2.11) gives
and this implies (2.12). Therefore
So (2.13), viz., implies
where .
Hence by Corollary 2.8, there exist such that and . This implies that is a coincidence point of f and S, and is a coincidence point of g and T. □
Corollary 2.15 Let and be such that , and let one of , or be a complete subspace of X. Assume there exists such that, for every ,
implies
Then and are nonempty.
Proof It follows from Theorem 2.14 when . □
Corollary 2.16 [10]
Let and be such that , and let or or be a complete subspace of X. Assume there exists such that, for every ,
implies
Then there exists such that .
Proof It follows from Theorem 2.14 when . □
Corollary 2.17 [23]
Let X be a complete metric space and let . Assume there exists such that, for every ,
implies
Then there exists a unique point such that .
Proof It follows from Theorem 2.14 when f and g are the identity maps on X. □
Corollary 2.18 Let and be such that , and let or be a complete subspace of X. Assume there exists such that, for every ,
implies
Then there exists such that .
Proof It follows from Theorem 2.14 when and . □
Corollary 2.19 Let X be a complete metric space and let . Assume there exists such that, for every ,
implies
Then there exists a unique point such that .
Proof It follows from Theorem 2.14 that S has a fixed point when is the identity map on X and . The uniqueness of the fixed point follows easily. □
3 Applications
Throughout this section, we assume that U and V are Banach spaces, and . Let R denote the field of reals, , and . Considering W and D as the state and decision spaces respectively, the problem of dynamic programming reduces to the problem of solving the functional equations:
Indeed, in the multistage process, some functional equations arise in a natural way (cf. Bellman [41] and Bellman and Lee [42]; see also [10, 43–47], and [23]). In this section, we study the existence of a common solution of the functional equations (3.1a) and (3.1b) arising in dynamic programming.
Let denote the set of all bounded real-valued functions on W. For an arbitrary , define . Then is a Banach space. Suppose that the following conditions hold:
(DP-1) , , , , g, and are bounded.
(DP-2) Let be defined as in the previous sections. Assume that there exists such that, for every , , and ,
implies
where
and , , , and are defined as follows:
(DP-3) For any , there exist such that
(DP-4) There exist such that
and
Theorem 3.1 Assume the conditions (DP-1)-(DP-4) hold. Let be a closed convex subspace of . Then the functional equations (3.1a) and (3.1b), , have a unique bounded common solution in .
Proof For any , let . Then is a complete metric space.
Let λ be an arbitrary positive number and . Pick , and choose such that
where .
Further,
Therefore, the first inequality in (DP-2) becomes
and this together with (3.1), (3.3), and (3.4) implies
Similarly, (3.1), (3.2), and (3.4) imply
So, from (3.5) and (3.6), we obtain
As is arbitrary and (3.7) is true for any , taking supremum, we find from (3.4) and (3.7) that
implies
Therefore, Corollary 2.8 applies, wherein , , , and correspond, respectively, to the maps P, Q, f, and g. So , , , and have a unique common fixed point , that is, is the unique bounded common solution of the functional equations (3.1a) and (3.1b), . □
Now we furnish an example in support of Theorem 3.1.
Example 3.2 Let be a Banach space endowed with the standard norm defined by , for all . Suppose be the state space, and be the decision space.
Define by
For any , and , define by
Define by
Notice that , , , , g, and are bounded. Also
We see that
Thus
and this implies
Finally for any with , we have , that is, , and with , we have , that is, .
Thus all the assumptions of Theorem 3.1 are satisfied. So the system of equations (3.1a) and (3.1b) has a unique solution in .
Corollary 3.3 Suppose that the following conditions hold:
-
(i)
G, , , g, and are bounded.
-
(ii)
Let be defined as in the previous sections. Assume that there exists such that, for every , , and ,
implies
where
and A, , and are defined as follows:
-
(iii)
For any , there exist such that
-
(iv)
There exist such that
and
Then the functional equations (3.1a) and (3.1b), , have a unique bounded common solution in .
Proof It follows from Theorem 3.1 when . □
Corollary 3.4 [10]
Suppose that the following conditions hold:
-
(i)
, , F, g, and are bounded.
-
(ii)
Assume there exists such that, for every , and ,
implies
where , , and J are defined as follows:
-
(iii)
For any , there exist such that
-
(iv)
There exist such that
and
Then the functional equations (3.1a) and (3.1b) with possesses a unique bounded common solution in W.
Proof It follows from Theorem 3.1 when . □
As an immediate consequence of Theorem 3.1 and Corollary 2.6, we obtain the following.
Corollary 3.5 [23]
Suppose that the following conditions hold:
-
(i)
, , and g are bounded.
-
(ii)
There exists r∈ [0,1) such that, for every , , and ,
implies
where and are defined as follows:
Then the functional equation (3.1a) possesses a unique bounded solution in W.
Proof It follows from Corollary 3.4 when , , and as the assumption (DP-3) becomes redundant in this context. □
The following result generalizes a recent result of Singh and Mishra [[11], Corollary 4.2], which in turn extends certain results from [42] and [43].
Corollary 3.6 Suppose that the following conditions hold:
-
(i)
G and g are bounded.
-
(ii)
There exists such that, for every , , and ,
implies
where K is defined as
Then the functional equation (3.1a) with possesses a unique bounded solution in W.
Proof It follows from Corollary 3.5 when . □
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Acknowledgements
The authors thank the referees for their deep understanding, appreciation, and suggestions to improve upon the original typescript. They are also thankful to the Spanish Government for its support of this research through Grant DPI2012-30651, and to the Basque Government for its support of this research trough Grants IT378-10 and SAIOTEK S-PE12UN015. Further, they acknowledge the financial support by the University of Basque Country through Grant UFI 2011/07.
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Singh, S.L., Kamal, R. & De la Sen, M. Coincidence and common fixed point theorems for Suzuki type hybrid contractions and applications. Fixed Point Theory Appl 2014, 147 (2014). https://doi.org/10.1186/1687-1812-2014-147
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DOI: https://doi.org/10.1186/1687-1812-2014-147