Let E be real normed linear space. The modulus of convexity of E is the function (พิมพ์) defined by (พิมพ์)
E is said to be a real convex if and only if (พิมพ์) for all (พิมพ์)
The norm of E is said to be Frechet differentiable if for each (พิมพ์) with (พิมพ์)
Exists and is attained uniformly for y, with (พิมพ์)
A mapping (พิมพ์) is said to be semi-compact if , for any bounded sequence (พิมพ์) in K such that (พิมพ์) there exists a subsequence say (พิมพ์) such that (พิมพ์) converges strongly to some (พิมพ์) is said to be completely continuous if for every bounded sequence (พิมพ์) there exists a subsequence say (พิมพ์) such that the sequence (พิมพ์) converges to some element of the range of T.
A Banach space E said to satisfy Opial’s condition if for any sequence (พิมพ์) converges weakly implies that (พิมพ์)
For all (พิมพ์)
Mapping (พิมพ์) is said to satisfy condition (พิมพ์) if there exists a non-decreasing function (พิมพ์)
As Tan and Xu {15} pointed out , condtion (A) is weaker than the compactness of K. Yang {20}modified this conditinn for a finite of non-self- asymptotically non-expansive mapping (พิมพ์) as follows
Let K be a non-empty subset of E, the mapping (พิมพ์) are said to satisfy condition (พิมพ์) if there exists a non-decreasing function (พิมพ์)
For all (พิมพ์) where (พิมพ์) We know that condition (พิมพ์) is weaker than the compactness of K, and condition (A) is a special case of (พิมพ์)
In what follows, the following lemmas are needed to prove our main results.