Contents Part I Split feasibility problem Chapter 1 Introduction to split feasibility problem 3 1.1 Abstract space and their property 4 1.2 Split feasibility problem 10 1.3 General split feasibility problem 22 1.4 Conclusions 28 Chapter 2 Weak convergence theorems for solving the split feasibility problem 29 2.1 Introduction to split feasibility problem 29 2.2 Preliminaries for weak convergence theorems 36 2.3 Main results 36 2.4 Applications for the theorems 39 2.5 Conclusions 42 Chapter 3 Strong convergence theorems for solving the split feasibility problem 43 3.1 Introduction to the background knowledge 43 3.2 Preliminaries for strong convergence theorems 46 3.3 Main results 47 3.4 Applications for the theorems 51 3.5 Conclusions 54 Chapter 4 Convergence theorems for solving the split common fixed point problem 55 4.1 Introduction to split common fixed point problem 55 4.2 Preliminaries for convergence theorems 57 4.3 Main results 60 4.4 Conclusions 81 Part II Fixed point problems Chapter 5 Introduction to fixed point problems 85 5.1 Some elementary definitions and properties in Banach space 85 5.2 Some elementary definitions and properties on monotone operator and accretive operator 88 5.3 Brief history on iteration solution of nonlinear operators 90 5.4 Brief history on iteration solution of nonlinear operator semigroups 93 5.5 Conclusions 96 Chapter 6 Fixed point theorems of k-strictly pseudo-contractive mappings in Hilbert space 97 6.1 Introduction to k-strictly pseudo-contractive mappings in Hilbert space 97 6.2 Preliminaries for convergence theorems 102 6.3 Main results 107 6.4 Conclusions 111 Chapter 7 Fixed point theorems of k-strictly pseudo-contractive mappings in Banach space 113 7.1 Introduction to k-strictly pseudo-contractive mappings in Banach space 113 7.2 Preliminaries for convergence theorems 119 7.3 Main results 120 7.4 Conclusions 124 Chapter 8 Common fixed point theorems of asymptotically pseudocontractive semigroups 125 8.1 Introduction to asymptotically pseudo-contractive semigroups 125 8.2 Preliminaries for common fixed point theorems 131 8.3 Main results 132 8.4 Conclusions 136 Part III Equilibrium problems Chapter 9 Introduction to equilibrium problems 139 9.1 Some elementary definitions and properties 139 9.2 Brief history of equilibrium problems 140 9.3 Conclusions 145 Chapter 10 Convergence theorems for solving equilibrium problems and optimization problems 146 10.1 Introduction to equilibrium problems 146 10.2 Preliminaries for convergence theorems 150 10.3 Main results 154 10.4 Applications for optimization problems 167 10.5 Conclusions 168 Chapter 11 Convergence theorems for equilibrium and fixed point problems 169 11.1 Introduction to equilibrium and fixed point problems 169 11.2 Preliminaries for convergence theorems 171 11.3 Main results 172 11.4 Conclusions 180 Bibliography 181