研究了一类非连续的单调函数,即具有两个集值点的映射的迭代根。通过迭代根的单调性和集值点个数的变化,给出其两次根不存在的条件。
In this paper, we consider iterative roots of uncontinuous andmonotone functions, i. e., a class of multifunctions with two set-value points. By investigating the change of monotonicity and the number of set-value pointsfor its iterative roots, we give the condition of nonexistence of square roots.