For a Banach Space X Garcia-Falset introduced the coefficient R(X) and showed that if R(X) 〈 2 then X has a fixed point. In this paper, we define a mean non-expansive mapping T on X in the sense that ||Tx - TY...For a Banach Space X Garcia-Falset introduced the coefficient R(X) and showed that if R(X) 〈 2 then X has a fixed point. In this paper, we define a mean non-expansive mapping T on X in the sense that ||Tx - TY|| ≤ a||x - y|| + b||x - Ty|| for any x,y E X, where a,b ≥ 0, a + b ≤ 1. We show that if R(X) 〈 1/1+b then T has a fixed point in X.展开更多
基金the National Natural Science Foundation of China(No.10461006)the Natural Science Foundation of Shandong Province(Y002A10)the Younger Foundation of Yantai University(SX05Z9)
文摘For a Banach Space X Garcia-Falset introduced the coefficient R(X) and showed that if R(X) 〈 2 then X has a fixed point. In this paper, we define a mean non-expansive mapping T on X in the sense that ||Tx - TY|| ≤ a||x - y|| + b||x - Ty|| for any x,y E X, where a,b ≥ 0, a + b ≤ 1. We show that if R(X) 〈 1/1+b then T has a fixed point in X.