POSITIVE SOLUTION OF A CLASS OF EQUATIONS INVOLVING NONCOMPACT MAPPINGS

In this paper, we define a generalized relative degree for A-proper mappings from a relative open subset of a Banach space into another Banach space and introduce the concepts of generalized P-compact and P_1-compact mappings. Next, we show several existence theorems of positive solutions for the equations involving these mappings. Our theorems improve and extend some recent results.     

Positive solution of a class of equations involving noncompact mappings

In this paper, we define a generalized relative degree for A-proper mappings from a relative open subset of a Banach space into another Banach space and introduce the concepts of generalized P-compact and P₁-compact mappings. Next, we show several existence theorems of positive solutions for the equations involving these mappings. Our theorems improve and extend some recent results.     

一类含非紧映象方程的正解

本文定义了从一个Banach空间的相对开子集到另一个Banach空间的A-proper映象的广义相对拓扑度并且引入了广义P-紧和P₁-紧概念.其次,我们证明了含这些映象的方程的正解存在性定理.我们的定理改进和推广了最近的一些结果.     

Fixed point index of uniform limit of set-Valued strict set-contractive mappings and its applications

In this paper,the class of uniform limit mappings of set-valued,strick set-contractivemappings is discussed.Furthermore,the fixed point index theory for the uniform limitmappings is established.Using the fixed point index theory,some positive fixed pointtheorems are proved.Our theorems generalize some results in[1,4,5,7].     

P1—紧映象的多解结果及其应用

本文应用A-proper映象的不动点指数理论(见[4]、[7]),获得了P_I-紧映象的一个多解结果,它类似于全连续映象,k-集压缩映象,k∈[0,1),凝聚映象和半紧1-集压缩映象的相应结论,这里的证明方法不同于上述文献中相应定理的证明,结果改进了[9—10]、[12]、[14]中相应结论。 设F是具有完备投影逼近格式Γ={X_n,P_n}的Banach空间X中一闭凸集使得P_n(F)     

Minimal and maximal fixed point theorems and iterative technique for nonlinear operators in product spaces

In this paper, we study minimal and maximal fixed point theorems and iterative technique for nonlinear operators in product spaces. As a corollary of our result, some coupled fixed point theorems are obtained, which generalize the coupled fixed point theorems obtained by Guo Da-jun and Lankshmikanthamt and the results obtained by Lan in, and.     

乘积空间中非线性算子的极大极小不动点定理及迭代法*

本文研究了乘积空间中非线性算子的极大极小不动点和迭代法.作为我们结果的推论,一些耦合不动点定理被获得、它们推广了由郭大钧和Lankshmikantham获得的耦合不动点定理.(见Nonlinear Anal、11(1986),623-632)和由兰在[4]、[6]中获得的结果.