- Research
- Open Access
Solving GNOVI frameworks involving $({\gamma}_{G},\lambda )$-weak-GRD set-valued mappings in positive Hilbert spaces
- Hong Gang Li^{1},
- Xian Bing Pan^{2}Email author,
- Zhi Ying Deng^{1} and
- Chang You Wang^{1}
https://doi.org/10.1186/1687-1812-2014-146
© Li et al.; licensee Springer. 2014
- Received: 4 March 2014
- Accepted: 25 June 2014
- Published: 22 July 2014
Abstract
First, a new concept, positive Hilbert spaces, is introduced and some fundamental inequalities which are applied to studying the properties of the resolvent operator associated for $({\gamma}_{G},\lambda )$-weak-GRD set-valued mappings are introduced and discussed in positive Hilbert spaces. Next, by using the resolvent operator and fixed point theory, an existence theorem and an approximation algorithm to solve a new class of general nonlinear ordered inclusions are established and suggested. In this field, the results obtained seem to be general in nature.
MSC:49J40, 47H06.
Keywords
- general nonlinear ordered inclusion frameworks
- positive Hilbert spaces
- inequalities
- $({\gamma}_{G},\lambda )$-weak-GRD set-valued mapping
- approximation algorithm
1 Introduction
Generalized nonlinear variational inclusion was introduced and studied by Hassouni and Moudafi [1]; it is useful and important in, for example, optimization and control, nonlinear programming, economics, mathematics, physics and engineering sciences. From 1989, Chang and Zhu [2], Chang and Huang [3], Ding and Jong [4], Ding and Luo [5], Jin [6], Li [7], Ahmad and Bazán [8], Chang [9], Cho et al. [10] and in recent years, Huang and Fang [11, 12], Chang and Huang [13], Fang et al. [14], Lan et al. [15] and others studied the properties of many kinds of resolvent operators (generalized m-accretive mappings, generalized monotone mappings, maximal η-monotone mappings, H-monotone operators, $(H,\eta )$-monotone operators, $(A,\eta )$-accretive mappings) and variational inequalities (inequalities, equalities, quasi-variational inclusions, quasi-complementarity) for fuzzy mappings, generalized random multivalued mappings etc.
On the other hand, in 1972, a number of solutions of nonlinear equations were introduced and studied by Amann [16]; and in recent years, the nonlinear mapping fixed point theory and application have been intensively studied in ordered Banach spaces [17–19]. Therefore, it is very important and natural for generalized nonlinear ordered variational inequalities (ordered equation) to be studied and discussed.
In 2008, the author introduced the generalized nonlinear ordered variational inequalities (the ordered equations) and studied an approximation algorithm and an approximation solution for a class of generalized nonlinear ordered variational inequalities and ordered equations in ordered Banach spaces [20]. In 2009, by using the B-restricted-accretive method of the mapping A with constants ${\alpha}_{1}$, ${\alpha}_{2}$, the author introduced and studied a new class of general nonlinear ordered variational inequalities and equations and established an existence theorem and an approximation algorithm of solutions for this kind of generalized nonlinear ordered variational inequalities (equations) in ordered Banach spaces [21]. In 2011, by using the resolvent operator associated with an RME set-valued mapping, the author introduced and studied a class of nonlinear inclusion problems for ordered RME set-valued mappings to find $x\in X$ such that $0\in M(x)$ ($M(x)$ is a set-valued mapping), and the existence theorem of solutions and an approximation algorithm for this kind of nonlinear inclusion problems for ordered extended set-valued mappings in ordered Hilbert spaces [22]. In 2012, the author introduced and studied a class of nonlinear inclusion problems for ordered $(\alpha ,\lambda )$-NODM set-valued mappings and then, applying the resolvent operator associated with $(\alpha ,\lambda )$-NODM set-valued mappings, established the existence theorem on the solvability and a general algorithm applied to the approximation solvability of the nonlinear inclusion problem of this class of nonlinear inclusion problems, based on the existence theorem and the new $(\alpha ,\lambda )$-NODM model in an ordered Hilbert space [23]. In Banach spaces, the author proved sensitivity analysis of the solution for a new class of general nonlinear ordered parametric variational inequalities to find $x=x(\lambda ):\mathrm{\Omega}\to X$ such that $A(g(x,\lambda ),\lambda )+f(x,\lambda )\ge \theta $ ($A(x)$, $g(x)$ and $F(\cdot ,\cdot )$ are single-valued mappings) in 2011 [24]. In this field, the obtained results seem to be general in nature.
Very recently, in 2013, the author introduced and studied characterizations of ordered $({\alpha}_{A},\lambda )$-weak-ANODD set-valued mappings, which was applied to solving an approximate solution for a new class of general nonlinear mixed order quasi-variational inclusions involving ⊕ operator in ordered Banach spaces [25] and GNM ordered variational inequality system with ordered Lipschitz continuous mappings in ordered Banach spaces [26]. In 2014, a class of nonlinear mixed ordered inclusion problems for ordered $({\alpha}_{A},\lambda )$-ANODM set-valued mappings with strong comparison mapping A [27] and sensitivity analysis for GSV parametric OVI with $(\alpha ,\lambda )$-NODSM mappings in ordered Banach spaces [28] were introduced and studied. Now, it is excellent that we are introducing positive Hilbert spaces and studying the properties of $({\gamma}_{G},\lambda )$-weak ordered GRD set-valued mappings, which is applied to finding a solution for a new class of general nonlinear ordered inclusion frameworks involving a strong comparison mapping in positive Hilbert spaces. For details, we refer the reader to [1–50] and the references therein.
2 Fundamental inequalities in positive Hilbert spaces
In this paper, unless specified otherwise, X expresses a real ordered Hilbert space with an inner product $\u3008\cdot ,\cdot \u3009$, a norm $\parallel \cdot \parallel $, a zero element θ, a normal cone P with normal constant $N>0$ and a partially ordered relation ≤ defined by a normal cone P. For $x,y\in X$, x and y are said to be comparable to each other if and only if $x\le y$ (or $y\le x$) holds (denoted by $x\propto y$ for $x\le y$ and $y\le x$) [23]. $CB(X)$ expresses the family of all nonempty closed bounded subsets of X.
Lemma 2.1 ([25])
- (i)
If $x\propto y$, then $lub\{x,y\}$ and $glb\{x,y\}$ exist, $x-y\propto y-x$, and $\theta \le (x-y)\vee (y-x)$;
- (ii)
If $x\vee y=lub\{x,y\}$, $x\wedge y=glb\{x,y\}$, $x\oplus y=(x-y)\vee (y-x)$, $x\odot y=(x-y)\wedge (y-x)$, then the following relations hold:
- (1)
$x\oplus y=y\oplus x$, $x\oplus x=\theta $, $x\odot y=y\odot x=-(x\oplus y)$;
- (2)
let λ be real, then $(\lambda x)\oplus (\lambda y)=|\lambda |(x\oplus y)$;
- (3)
let $(x+y)\vee (u+v)$ exist, and if $x\propto u,v$ and $y\propto u,v$, then $(x+y)\oplus (u+v)\le (x\oplus u+y\oplus v)\wedge (x\oplus v+y\oplus u)$;
- (4)
if $x\le y$ and $u\le v$, then $x+u\le y+v$;
- (5)
if $x\propto y$, then $x\oplus y=\theta $ if and only if $x=y$;
- (6)
$x\vee y=x+y-(x\wedge y)$;
- (7)
$\alpha x\oplus \beta x=|\alpha -\beta |x$ if $x\propto \theta $.
Definition 2.2 An ordered Hilbert space X is said to be a positive Hilbert space with a partially ordered relation ≤ (denoted by ${X}_{P}$) if for any $x,y\in X$, $x\ge \theta $ and $y\ge \theta $, then $\u3008x,y\u3009\ge 0$.
Example 2.3 Let $X={\mathbf{R}}^{n}$ be a real n-dimensional ordered inner product space with orthogonal basis ${\{{\alpha}_{i}\}}_{i=1}^{n}$. Setting $\mathbf{P}=\{\beta ={\sum}_{i=1}^{n}{k}_{i}{\alpha}_{i}|{k}_{i}\ge 0,{k}_{i}\in {\mathbf{R}}^{n}\phantom{\rule{0.25em}{0ex}}(1\le i\le n)\}$, it is a normal cone, then ${\mathbf{R}}_{P}^{n}$ is a positive Hilbert space.
Theorem 2.4 (Inequalities I)
- (1)
$x\le x\vee y$, $y\le x\vee y$, $x\wedge y\le x$, $x\wedge y\le y$, $x\odot y\ge x\oplus y$;
- (2)
$x\le y$ if and only if $-y\le -x$;
- (3)
$x-(y\vee z)\le (x-y)\wedge (x-z)$, $x+(y\vee z)\le (x+y)\vee (x+z)$;
- (4)
$x-(y\wedge z)\ge (x-y)\vee (x-z)$, $x+(y\wedge z)\le (x+y)\wedge (x+z)$;
- (5)
if $\theta \le x$, $\theta \le y$, then $x\oplus y\le x\vee y$, $x\odot y\le x\wedge y$;
- (6)
$(x+y)\oplus (z+w)\ge ((x\oplus z)-(y\oplus w))\vee ((x\oplus w)-(y\oplus z))$.
Proof Obviously, (1)-(5) hold for Lemma 2.1 and Definition 2.2.
and hence (6) holds for $x+y=y+x$ and $x\oplus y=y\oplus x$. □
Theorem 2.5 (Inequalities II)
- (1)
if $x\le y$, $\theta \le z$, then $\u3008y,z\u3009\ge \u3008x,z\u3009$;
- (2)
if $\theta \le z$, then $\u3008x\vee y,z\u3009\ge \u3008x,z\u3009\vee \u3008y,z\u3009$, $\u3008x,z\u3009\wedge \u3008y,z\u3009\ge \u3008x\wedge y,z\u3009$;
- (3)
if $\theta \le z$, then $\u3008x+y,z\u3009\ge \u3008x,z\u3009\vee \u3008y,z\u3009+\u3008x\wedge y,z\u3009$;
- (4)
if $\theta \le z$, then $\u3008x\vee y,z\u3009\ge \u3008x,z\u3009+\u3008y,z\u3009-\u3008x,z\u3009\wedge \u3008y,z\u3009$;
- (5)
if $\theta \le z$, then $\u3008x\oplus y,z\u3009\ge \u3008x,z\u3009\oplus \u3008y,z\u3009$.
It follows that (5) holds. □
3 Properties of $({\gamma}_{G},\lambda )$-weak-GRD set-valued mappings in positive Hilbert spaces
- (1)
[22]M is said to be an ordered rectangular mapping if for each $x,y\in X$, any ${v}_{x}\in M(x)$ and any ${v}_{y}\in M(y)$, $\u3008{v}_{x}\odot {v}_{y},-(x\oplus y)\u3009=0$ holds;
- (2)M is said to be a ${\gamma}_{G}$-ordered rectangular mapping with respect to G if there exists a constant ${\gamma}_{G}\ge 0$; for any $x,y\in X$, there exist ${v}_{x}\in M(G(x))$ and ${v}_{y}\in M(G(y))$ such that$\u3008{v}_{x}\odot {v}_{y},-(G(x)\oplus (y))\u3009\ge {\gamma}_{G}{\parallel G(x)\oplus G(y)\parallel}^{2}$
- (3)
M is said to be a weak comparison mapping with respect to G if for any $x,y\in X$, $x\propto y$, then there exist ${v}_{x}\in M(G(x))$ and ${v}_{y}\in M(G(y))$ such that $x\propto {v}_{x}$, $y\propto {v}_{y}$ and ${v}_{x}\propto {v}_{y}$, where ${v}_{x}$ and ${v}_{y}$ are said to be weak comparison elements, respectively;
- (4)
M with respect to G is said to be a λ-weak ordered different comparison mapping with respect to G if there exists a constant $\lambda >0$ such that for any $x,y\in X$, there exist ${v}_{x}\in M(G(x))$, ${v}_{y}\in M(G(y))$, $\lambda ({v}_{x}-{v}_{y})\propto x-y$ holds, where ${v}_{x}$ and ${v}_{y}$ are said to be λ-elements, respectively;
- (5)
A weak comparison mapping M with respect to B is said to be a $({\gamma}_{G},\lambda )$-weak-GRD mapping with respect to B if M is a ${\gamma}_{G}$-ordered rectangular and λ-weak ordered different comparison mapping with respect to B and $(G+\lambda M)(X)=X$ for $\lambda >0$, and there exist ${v}_{x}\in M(G(x))$ and ${v}_{y}\in M(G(y))$ such that ${v}_{x}$ and ${v}_{y}$ are $({\gamma}_{G},\lambda )$-elements, respectively.
- (1)
If ${\alpha}_{I}\lambda >\beta >0$, then ${J}_{M,\lambda}^{G}$ is a single-valued mapping;
- (2)If $\lambda ({\alpha}_{I}\wedge {\gamma}_{G})>\beta >0$, and $M:X\to CB(X)$ is a $({\gamma}_{G},\lambda )$-weak-GRD set-valued mapping with respect to ${J}_{M,\lambda}^{G}$, and ${v}_{x}\in M({J}_{M,\lambda}^{G}(x))$ and ${v}_{y}\in M({J}_{M,\lambda}^{G}(y))$ are ${\alpha}_{I}$, ${\gamma}_{G}$ and λ-elements, respectively, then the resolvent operator ${J}_{M,\lambda}^{G}$ of M is a comparison, and$\parallel {J}_{M,\lambda}^{G}(x)\oplus {J}_{M,\lambda}^{G}(y)\parallel \le \frac{1}{{\gamma}_{G}\lambda -\beta}\parallel x\oplus y\parallel .$(3.1)
where ${v}_{x}$ and ${v}_{y}$ are ${\alpha}_{I}$-elements, respectively.
and ${\alpha}_{I}{\parallel x\oplus y\parallel}^{2}\le \frac{\beta}{\lambda}{\parallel x\oplus y\parallel}^{2}$ for Theorems 2.4 and 2.5. It follows that $x=y={J}_{M,\lambda}^{G}(u)$ and ${J}_{M,\lambda}^{G}(u)$ is a single-valued mapping from ${\alpha}_{I}\lambda >\beta >0$.
Hence, $G({J}_{M,\lambda}^{G}(y))\propto G({J}_{M,\lambda}^{G}(x))$, and ${J}_{M,\lambda}^{G}(y)\propto {J}_{M,\lambda}^{G}(x)$ by strong comparability of G.
□
4 Approximation solution for GNOVI frameworks
In this section, by using Theorems 2.4 and 2.5 and Theorem 3.3, we study a new class of GNOVI frameworks in positive Hilbert spaces.
which is called a new class of general nonlinear ordered variational inclusion frameworks (GNOVI) in positive Hilbert spaces.
Remark 4.1 If $M(x)=A(g(x))$ is single-valued, $w=\theta $ and $\rho =1$, then (4.1) reduces to (2.1) in [20]; when $M(x)=A(x)\oplus F(x,g(x))$, $w=\theta $ and $\rho =1$, then (4.1) reduces to (1.1) in [21]; if $w=\theta $, then (1.1) in [22] or [23] can be obtained as special cases of (4.1) as $\rho =1$.
Lemma 4.2 Let ${X}_{P}$ be a real positive Hilbert space with normal constant N, let G be a strong comparison and β-ordered compressed mapping, and let $M:X\to CB(X)$ be a $({\gamma}_{G},\lambda )$-weak ordered GRD set-valued mapping with respect to ${J}_{M,\lambda}^{G}$. Then the inclusion problem (2) has a solution ${x}^{\ast}$ if and only if ${x}^{\ast}={J}_{M,\lambda}^{G}(G({x}^{\ast})+\frac{\lambda}{\rho}w)$ in X.
Proof For $\rho >0$, take notice of the fact that $w\in \rho M(x)$ if and only if $\frac{w}{\rho}\in M(x)$, this directly follows from the definition of ${J}_{M,\lambda}^{G}$ and problem (4.1). □
then there exists a solution ${x}^{\ast}$ of GNOVI (4.1), which is a fixed point of ${J}_{M,\lambda}^{G}$, that is converged strongly by a sequence ${\{{x}_{n}\}}_{n=0}^{\mathrm{\infty}}$ generated by the following algorithm:
Proof Let ${X}_{P}$ be a positive Hilbert space with normal constant N, let G be a strong comparison and β-ordered compression mapping, and let $M(x)=\{v|v\in M(x)\}:X\to CB(X)$ ($\rho >0$) be a $({\gamma}_{G},\lambda )$-weak-GRD set-valued mapping with respect to ${J}_{M,\lambda}^{G}$.
It follows that ${J}_{M,\lambda}^{G}(G+\frac{\lambda}{\rho}w)$ has a fixed point ${x}^{\ast}$, which is a solution ${x}^{\ast}$ for GNOVI (4.1), from Lemma 4.2 and (4.5).
then the sequence ${\{{x}_{n}\}}_{n=0}^{\mathrm{\infty}}$ converges strongly to a solution ${x}^{\ast}$ of problem (4.1), which is generated by (4.4). This completes the proof. □
Remark 4.4 (i) For a suitable choice of the mappings G, M and constant ρ, we can obtain several known results of [20] and [22] as special cases of Theorem 4.3.
(ii) There exists $\beta >0$ satisfying (4.3). In fact, if we change (4.3) to $\beta +N{\beta}^{2}<{\gamma}_{G}\lambda $ as $0<a\uparrow 1$, then $\frac{\sqrt{1+4N{\gamma}_{G}\lambda}-1}{2}>\beta >0$ holds.
Declarations
Acknowledgements
The authors acknowledge the support of the Educational Science Foundation of Chongqing (KJ1400426) and the support of the Scientific and Technological Research Program of Chongqing Municipal Education Commission of China (KJ120520).
Authors’ Affiliations
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