Convergence theorem for zeros of generalized Lipschitz generalized phi-quasi-accretive operators

Author:

Chidume C.,Chidume C.

Abstract

Let E E be a uniformly smooth real Banach space and let A : E E A: E \rightarrow E be a mapping with N ( A ) N(A)\neq \emptyset . Suppose A A is a generalized Lipschitz generalized Φ \Phi -quasi-accretive mapping. Let { a n } , { b n } , \{a_{n}\}, \{b_{n}\}, and { c n } \{c_{n}\} be real sequences in [0,1] satisfying the following conditions: (i) a n + b n + c n = 1 a_{n} + b_{n} + c_{n} = 1 ; (ii) ( b n + c n ) = \sum (b_{n} + c_{n} ) = \infty ; (iii) c n > \sum c_{n} > \infty ; (iv) lim b n = 0. \lim b_{n} = 0. Let { x n } \{x_{n}\} be generated iteratively from arbitrary x 0 E x_{0}\in E by \[ x n + 1 = a n x n + b n S x n + c n u n , n 0 , x_{n+1} = a_{n}x_{n} + b_{n}Sx_{n} + c_{n}u_{n}, n\geq 0, \] where S : E E S: E\rightarrow E is defined by S x := x A x   x E Sx:=x-Ax ~\forall x\in E and { u n } \{u_{n}\} is an arbitrary bounded sequence in E E . Then, there exists γ 0 \gamma _{0}\in \Re such that if b n + c n γ 0     n 0 , b_{n} + c_{n} \leq \gamma _{0} ~\forall ~ n\geq 0, the sequence { x n } \{x_{n}\} converges strongly to the unique solution of the equation A u = 0 Au = 0 . A related result deals with approximation of the unique fixed point of a generalized Lipschitz and generalized ϕ \phi -hemi-contractive mapping.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

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