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Strong convergence theorems for uniformly L-Lipschitzian asymptotically pseudocontractive mappings in Banach spaces

Abstract

In this paper, we establish some strong convergence theorems of the modified Ishikawa and Mann iterations with errors of uniformly L-Lipschitzian asymptotically pseudocontractive mappings in real Banach spaces. Our results not only provide the new proof method, but also extend the known corresponding results given in (Chang in Proc. Am. Math. Soc. 129:845-853, 2001; Chang et al. in Appl. Math. Lett. 22:121-125, 2009; Goebel and Kirk in Proc. Am. Math. Soc. 35:171-174, 1972; Ofoedu in J. Math. Anal. Appl. 321:722-728, 2006; Schu in J. Math. Anal. Appl. 158:407-413, 1991). In order to get some applications of our results, we also provide specific examples.

MSC:47H09, 47H10.

1 Introduction and preliminaries

Let E be a real Banach space and let J denote the normalized duality mapping from E into 2 E defined by

J(x)= { f E : x , f = x 2 = f 2 }

for all xE, where E denotes the dual space of E and , denotes the generalized duality pairing, respectively. The normalized duality mapping J has the following properties:

  1. (1)

    J is an odd mapping, i.e., J(x)=J(x).

  2. (2)

    J is positive homogeneous, i.e., for any λ>0, J(λx)=λJ(x).

  3. (3)

    J is bounded, i.e., for any bounded subset A of E, J(A) is a bounded subset of E .

  4. (4)

    If E is smooth (or E is strictly convex), then J is single-valued.

In the sequel, we denote the single-valued normalized duality mapping by j. In a Hilbert space H, j is the identity mapping.

Let D be a nonempty closed convex subset of E. A mapping T:DD is said to be asymptotically nonexpansive with a sequence { k n }[1,+) and lim n k n =1 if, for all x,yD,

T n x T n y k n xy
(1.1)

for all n1. The mapping T is said to be asymptotically pseudocontractive with a sequence { k n }[1,+) and lim n k n =1 if, for any x,yD, there exists j(xy)J(xy) such that

T n x T n y , j ( x y ) k n x y 2
(1.2)

for all n1. Furthermore, the mapping T is said to be uniformly L-Lipschitzian if, for any x,yD, there exists a constant L>0 such that

T n x T n y Lxy
(1.3)

for all n1.

It is easy to see that if T is an asymptotically nonexpansive mapping, then it is both asymptotically pseudocontractive and uniformly L-Lipschitzian. The converse is not true in general. Therefore, it is interesting to study these mappings in fixed point theory and its applications. In fact, the asymptotically nonexpansive and asymptotically pseudocontractive mappings were first introduced by Goebel-Kirk [1] and Schu [2], respectively. Since then, some authors have studied several iterative sequences for asymptotically nonexpansive and asymptotically pseudocontractive mappings in Hilbert spaces and Banach spaces (see [311]).

In [2], Schu proved the following theorem.

Theorem 1.1 [2]

Let H be a Hilbert space, K be a nonempty bounded closed convex subset of H and T:KK be a completely continuous, uniformly L-Lipschitzian and asymptotically pseudocontractive mapping with a sequence { k n }[1,+) satisfying the following conditions:

(a-1) k n 1 as n;

(a-2) n = 1 ( q n 2 1)<, where q n =2 k n 1.

Suppose further that { α n } and { β n } are two sequences in [0,1] such that ϵ< α n <b for all n1, where ϵ>0 and b(0, L 2 [ ( 1 + L 2 ) 1 / 2 1]). For any x 1 K, let { x n } be an iterative sequence defined by

x n + 1 =(1 α n ) x n + α n T n x n

for all n1. Then { x n } converges strongly to a fixed point of T in K.

In [12], Chang extended above Theorem 1.1 to the setting of real uniformly smooth Banach spaces and proved the following.

Theorem 1.2 [12]

Let E be a uniformly smooth Banach space, K be a nonempty bounded closed convex subset of E and T:KK be an asymptotically pseudocontractive mapping with a sequence { k n }[1,+), lim n k n =1 and F(T), where F(T) is the set of fixed points of T in K. Let { α n } be a sequence in [0,1] satisfying the following conditions:

(a-1) α n 0 as n;

(a-2) n = 0 α n =.

For any x 0 K, let { x n } be an iterative sequence defined by

x n + 1 =(1 α n ) x n + α n T n x n

for all n0. If there exists a strictly increasing  function Φ:[0,+)[0,+) with Φ(0)=0 such that

T n x x , j ( x x ) k n x x 2 Φ ( x x )

for all xK and n0, where x F(T), then x n x as n.

In [13], Ofoedu extended Theorem 1.2 in a uniformly smooth Banach space to the setting of arbitrary real Banach spaces and dropped the boundedness assumption in Theorem 1.2.

Theorem 1.3 [13]

Let E be a real Banach space, K be a nonempty closed convex subset of E and T:KK be a uniformly L-Lipschitzian asymptotically pseudocontractive mapping with a sequence { k n }[1,+), lim n k n =1 and x F(T). Let { α n } be a sequence in [0,1] satisfying the following conditions:

(a-1) n = 0 α n =;

(a-2) n = 0 α n 2 <;

(a-3) n = 0 α n ( k n 1)<.

For any x 0 K, let { x n } be an iterative sequence defined by

x n + 1 =(1 α n ) x n + α n T n x n

for all n0. If there exists a strictly increasing  function Φ:[0,+)[0,+) with Φ(0)=0 such that

T n x x , j ( x x ) k n x x 2 Φ ( x x )

for all xK and n0. Then

  1. (1)

    { x n } is bounded;

  2. (2)

    { x n } converges strongly to x F(T).

Theorem 1.4 [13]

Let E be a real Banach space. Let K be a nonempty closed and convex subset of E, T:KK be a uniformly L-Lipschitzian asymptotically pseudocontractive mapping with a sequence { k n }[1,+) with lim n k n =1 and x F(T). Let { a n }, { b n } and { c n } be real sequences in [0,1] satisfying the following conditions:

(a-1) a n + b n + c n =1;

(a-2) n 0 ( b n + c n )=;

(a-3) n 0 ( b n + c n ) 2 <;

(a-4) n 0 ( b n + c n )( k n 1)<;

(a-5) n 0 c n <.

For arbitrary x 0 K, let { x n } be a sequence in K iteratively defined by

x n + 1 = a n x n + b n T n x n + c n u n

for all n0, where { u n } is a bounded sequence in K. Suppose that there exists a strictly increasing continuous function Φ:[0,+)[0,+) with Φ(0)=0 such that

T n x x , j ( x x ) k n x x 2 Φ ( x x )

for all xK. Then { x n } n 0 converges strongly to x F(T).

Very recently, in [14], Chang et al. proved the following theorem.

Theorem 1.5 [14]

Let E be a real Banach space. Let K be a nonempty closed convex subset of E, T i :KK be two uniformly L i -Lipschitzian mappings with F( T 1 )F( T 2 ) and x F( T 1 )F( T 2 ). Let { k n }[1,+) be a sequence with lim n k n =1. Let { α n } and { β n } be two sequences in [0,1] satisfying the following conditions:

(a-1) n = 0 α n =;

(a-2) n = 0 α n 2 <;

(a-3) n = 0 β n <;

(a-4) n = 0 α n ( k n 1)<.

For any x 0 K, let { x n } be an iterative sequence in K defined by

{ x n + 1 = ( 1 α n ) x n + α n T 1 n y n , y n = ( 1 β n ) x n + β n T 2 n x n

for all n0. If there exists a strictly increasing function Φ:[0,+)[0,+) with Φ(0)=0 such that

T i n x x , j ( x x ) k n x x 2 Φ ( x x )

for all j(x x )J(x x ) and xK, i=1,2, then { x n } converges strongly to x .

Also, some authors have studied the modified Halpern, Mann and Ishikawa iterative sequences for nonlinear mappings in Hilbert spaces and Banach spaces (see [15, 16]).

The aim of this paper is to give some strong convergence theorems for uniformly L-Lipschitzian and asymptotically pseudo contractive mappings in Banach spaces. Our results not only include the past ones known in [311], but also provide quite a different proof method.

For our main purpose, we recall some concepts and lemmas.

Definition 1.6 [17]

For arbitrary x 1 D, the sequence { x n } in D defined by

{ y n = ( 1 b n d n ) x n + b n T n x n + d n v n , x n + 1 = ( 1 a n c n ) x n + a n T n y n + c n u n
(1.4)

for all n1 is called the modified Ishikawa iteration with errors, where { a n }, { b n }, { c n }, { d n } are four real sequences in [0,1] satisfying a n + c n 1, b n + d n 1 and { u n }, { v n } are any bounded sequences in D.

In particular, if b n = d n =0 in (1.4), then the sequence { x n } defined by

x n + 1 =(1 a n c n ) x n + a n T n x n + c n u n
(1.5)

for all n1 is called the modified Mann iteration with errors.

If c n = d n =0 in (1.4) and (1.5), then the sequence { x n } defined by

{ y n = ( 1 b n ) x n + b n T n x n , x n + 1 = ( 1 a n ) x n + a n T n y n
(1.6)

and

x n + 1 =(1 a n ) x n + a n T n x n
(1.7)

for all n1 is called the modified Ishikawa iteration and the modified Mann iteration, respectively.

Lemma 1.7 [18]

Let E be a real Banach space and J:E 2 E be a normalized duality mapping. Then

x + y 2 x 2 +2 y , j ( x + y )

for all x,yE and j(x+y)J(x+y).

Lemma 1.8 [19]

Let { δ n }, { λ n } and { γ n } be three nonnegative real sequences and Φ:[0,+)[0,+) be a strictly increasing continuous function with Φ(0)=0 satisfying the following inequality:

δ n + 1 2 δ n 2 λ n Φ( δ n + 1 )+ γ n

for all n0, where λ n [0,1] with n = 0 λ n = and γ n =o( λ n ). Then δ n 0 as n.

2 Main results

Now, we give our main results in this paper.

Theorem 2.1 Let E be a real Banach space, D be a nonempty closed convex subset of E and T:DD be a uniformly L-Lipschitzian asymptotically pseudocontractive mapping with a sequence { k n }[1,+), lim n k n =1 and qF(T)={xD:Tx=x}. Let { a n }, { b n }, { c n } and { d n } be four real sequences in [0,1] satisfying the following conditions:

(A-1) a n , b n , d n 0 as n;

(A-2) n = 1 a n =;

(A-3) c n =o( a n ).

For some x 1 D, let { x n } be a modified Ishikawa iterative sequence with errors defined by (1.4). Suppose that there exists a strictly increasing continuous function Φ:[0,+)[0,+) with Φ(0)=0 such that

T n x q , j ( x q ) k n x q 2 Φ ( x q )
(2.1)

for all n1, where j(xq)J(xq). Then { x n } converges strongly to the fixed point q of T.

Proof Step 1. For any n1, { x n } is a bounded sequence.

Set sup{ k n :n1}=k. Then there exists x 1 D with x 1 T x 1 such that r 0 =(k+L) x 1 q 2 R(Φ). Indeed, for any taking x 1 D and x 1 T x 1 , we denote r 0 =(k+L) x 1 q 2 . If Φ(r)+ as r+, then r 0 R(Φ). If sup{Φ(r):r[0,+)}= r 1 <+ with r 1 < r 0 , then there exists a sequence { ξ n }D such that ξ n q as n with ξ n q, thus there exists a positive integer n 0 such that (k+L) ξ n q 2 < r 1 2 for all n n 0 . We redefine x 1 = ξ n 0 and (k+L) x 1 q 2 R(Φ).

Set R= Φ 1 ( r 0 ). Then we obtain x 1 qR. Denote

Next, we prove that x n B 1 for any n1. If n=1, then x 1 B 1 . Now, we assume that it holds for some n, i.e., x n B 1 . We prove that x n + 1 B 1 . Suppose that this does not hold. Then x n + 1 q>R. Now, we denote

τ 0 =min { 1 , R 2 L R + M , Φ ( R ) 10 R 2 , Φ ( R ) 10 M R , Φ ( R ) 10 R [ 2 L R + 3 L 2 R + 2 L ( M + R ) ] } .
(2.2)

Since a n , b n , c n , c n a n , d n , k n 10 as n, without loss of generality, let 0 a n , b n , c n , c n a n , d n , k n 1 τ 0 for any n1. Thus, we have

(2.3)
(2.4)

and

(2.5)

Applying Lemma 1.7 and the formulas above, we obtain

x n + 1 q 2 = ( 1 a n c n ) ( x n q ) + a n ( T n y n q ) + d n ( u n q ) 2 ( 1 a n ) 2 x n q 2 + 2 a n T n y n q , j ( x n + 1 q ) + 2 c n u n q , j ( x n + 1 q ) = ( 1 a n ) 2 x n q 2 + 2 a n T n x n + 1 q , j ( x n + 1 q ) + 2 a n T n y n T n x n + 1 , j ( x n + 1 q ) + 2 c n u n q , j ( x n + 1 q ) ( 1 a n ) 2 x n q 2 + 2 a n [ k n x n + 1 q 2 Φ ( x n + 1 q ) ] + 2 a n T n x n + 1 T n y n x n + 1 q + 2 c n u n q x n + 1 q ( 1 a n ) 2 R 2 + 2 a n [ k n x n + 1 q 2 Φ ( R ) ] + 2 a n 10 R Φ ( R ) 2 R + 4 c n M R ( 1 a n ) 2 R 2 + 2 a n [ k n x n + 1 q 2 Φ ( R ) ] + 4 a n 5 Φ ( R ) .
(2.6)

Since a n 0 and k n 1 as n, we have 2 k n a n 0 as n. Thus, without loss of generality, let 12 k n a n >0 for any n1. Then (2.6) implies that

(2.7)

which is a contradiction. Hence, x n + 1 B 1 , i.e., { x n } is a bounded sequence.

Step 2. We prove that x n q0 as n.

By Step 1, we obtain { x n q} is a bounded sequence and so is { y n q}. Let

M 0 = sup n { x n q } + sup n { y n q } + sup n { u n q } + sup n { v n q } .

Observe that

x n + 1 y n a n L T n y n x n + c n L u n x n + b n L x n T n x n + d n L x n v n a n L ( x n q + T n y n T n q ) + c n L ( u n q + x n q ) + b n L ( x n q + T n x n T n q ) + d n L ( v n q + x n q ) ( a n + b n ) L ( 1 + L ) M 0 + ( c n + d n ) L M 0 .
(2.8)

Using Lemma 1.7, (2.6) and (2.8), we have

(2.9)

where

A n =2 a n ( k n 1) M 0 2 + a n 2 M 0 2 +2 a n L [ ( a n + b n ) L ( 1 + L ) M 0 + ( c n + d n ) L M 0 ] M 0 +2 c n M 0 2 .

Let δ n = x n q 2 , λ n = a n and γ n = A n . Then (2.9) leads to

δ n + 1 2 δ n 2 λ n Φ( δ n + 1 )+ γ n .

Therefore, by Lemma 1.8, we obtain lim n δ n =0, i.e., x n q as n. This completes the proof. □

From Theorem 2.1, we have the following corollary.

Corollary 2.2 Let E be a real Banach space. Let D be a nonempty closed convex subset of E, T:DD be a uniformly L-Lipschitzian asymptotically pseudocontractive mapping with a sequence { k n }[1,+), lim n k n =1 and qF(T). Let { a n } and { c n } be two real sequences in [0,1] satisfying the following conditions:

(A-1) a n 0 as n;

(A-2) n = 1 a n =;

(A-3) c n =o( a n ).

For some x 1 D, let { x n } be a modified Mann iterative sequence with errors defined by (1.5). Suppose that there exists a strictly increasing  function Φ:[0,+)[0,+) with Φ(0)=0 such that

T n x q , j ( x q ) k n x q 2 Φ ( x q )
(2.10)

for all n1, where j(xq)J(xq). Then { x n } converges strongly to the fixed point q of T.

Proof In Theorem 2.1, letting b n =0, d n =0, we can get the convergence of the modified Mann iteration (1.5). □

Theorem 2.3 Let E be a real Banach space. Let D be a nonempty closed convex subset of E and T i :KK be two uniformly L i -Lipschitzian mappings with qF( T 1 )F( T 2 ). Let { k n }[1,+) be a sequence with k n 1 as n. Let { a n }, { b n }, { c n } and { d n } be four real sequences in [0,1] satisfying the following conditions:

(A-1) a n , b n 0 as n;

(A-2) n = 1 a n =;

(A-3) c n =o( a n ), d n 0 as n.

For some x 1 D, let { x n } be an iterative sequence with errors defined by

{ y n = ( 1 b n d n ) x n + b n T 1 n x n + d n v n , x n + 1 = ( 1 a n c n ) x n + a n T 2 n y n + c n u n
(2.11)

for all n1. Suppose that there exists a strictly increasing  function Φ:[0,+)[0,+) with Φ(0)=0 such that

T i n x q , j ( x q ) k n x q 2 Φ ( x q )
(2.12)

for all n1 and i=1,2, where j(xq)J(xq). Then { x n } converges strongly to the fixed point q of T 1 T 2 .

Proof Similarly, we can obtain the result of Theorem 2.3 by using the proof method of Theorem 2.1. □

Remark 2.4 Theorem 2.1 extends, improves and unifies Theorems 3.1, 3.2, 3.3 of [13] and Theorem 3.5 of [14] in the following sense:

  1. (1)

    The modified Mann iteration and modified Ishikawa iteration are replaced by the modified Ishikawa iteration with errors introduced by Xu [17].

  2. (2)

    The proof method of Theorem 2.1 is quite different from the method of [13, 14].

  3. (3)

    In [13], the author did not require the function Φ to be surjective. Since x 0 is an arbitrary point chosen in D, it is possible that Φ 1 ( a 0 ) is not well defined.

  4. (4)

    The conditions n = 0 α n 2 <, n = 0 α n ( k n 1)<, n = 0 β n < in [[13], Theorem 3.1, Theorem 3.2] and [[14], Theorem 2.1] are replaced by the more general conditions α n , β n 0 as n. Also, the conditions n 0 ( b n + c n ) 2 <, n 0 ( b n + c n )( k n 1)<, n 0 c n < in [[13], Theorem 3.3] are replaced by b n 0 as n and c n =o( b n ) of Corollary 2.2.

Remark 2.5 A mapping T is said to be weak uniformly Lipschitzian if there exists a constant L>0 such that

T n x T n y Lxy
(2.13)

for all n1, xD and yF(T). Then, using the same methods, we can also prove that Theorem 2.1 holds for the more general class of weak uniformly Lipschitzian asymptotically pseudocontractive mappings. In practical application, it can be seen from the following example.

Example 2.6 Let E= be the set of real numbers with the usual norm and D=[0,+). Define a mapping T:DD by

Tx= x 3 1 + x 2

for all xD. Then T has a fixed point q=0D and T is a strictly monotone increasing mapping. Thus, Txx for any xD, which implies that T n x T n 1 xTx. Define a function Φ:[0,+)[0,+) by Φ(t)= t 2 1 + t 2 . Then Φ is a strictly increasing continuous function with Φ(0)=0. For all xD and qF(T), if k n =1 and L=1, then we obtain

T n x T n q , j ( x q ) = T n x 0 , j ( x 0 ) = T n x , x T x , x = x 3 1 + x 2 , x = x 4 1 + x 2 = k n | x q | 2 | x q | 2 1 + | x q | 2 = k n | x q | 2 Φ ( | x q | )
(2.14)

and

| T n x T n q | = | T n x 0 | | T x 0 | = | x 3 1 + x 2 0 | | x 0 | L | x q | .
(2.15)

Therefore, T is weakly uniform Lipschitzian and satisfies (2.1) of Theorem 2.1.

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Acknowledgements

The authors are grateful to Professor Yeol-Je Cho for valuable suggestions which helped to improve the manuscript. The first author was supported by Hebei Provincial Natural Science Foundation (Grant No. A2011210033).

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Xue, Z., Lv, G. Strong convergence theorems for uniformly L-Lipschitzian asymptotically pseudocontractive mappings in Banach spaces. J Inequal Appl 2013, 79 (2013). https://doi.org/10.1186/1029-242X-2013-79

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Keywords

  • uniformly L-Lipschitzian mapping
  • asymptotically pseudocontractive mapping
  • fixed point
  • real Banach space