n the mathematical analysis,complex-variable function and realvariable funktion courses,convergence and limit the two concepts is common.These two concepts and can be divided into different limit and convergence,and with such properties such as the continuity of the change.Convergence and limit theory throughout the mathematical analysis,realvariable funktion and complex-variable function,which is the important content and the difficulties in mathematics.Knowledge of the thoughts and convergence and understanding between them is the premise of theory.Limit is the most basic mathematical analysis and the most important concept,especially the mathematical analysis,its thought throughout the mathematical analysis,and other fields of mathematics,in also plays an important role.The foundation is the ultimate definition and distance between the point.Due to the different space distance (or equivalent) distance and the difference in meaning and leads to a different convergence. n the mathematical analysis,complex-variable function and realvariable funktion courses,convergence and limit the two concepts is common.These two concepts and can be divided into different limit and convergence,and with such properties such as the continuity of the change.Convergence and limit theory throughout the mathematical analysis,realvariable funktion and complex-variable function,which is the important content and the difficulties in mathematics.Knowledge of the thoughts and convergence and understanding between them is the premise of theory.Limit is the most basic mathematical analysis and the most important concept,especially the mathematical analysis,its thought throughout the mathematical analysis,and other fields of mathematics,in also plays an important role.The foundation is the ultimate definition and distance between the point.Due to the different space distance (or equivalent) distance and the difference in meaning and leads to a different convergence.