【摘要】 Heine定理的基本形式、函数极限定义及确界原理,文中讨论了单调函数的单侧极限存在的充要条件,通过证明可见,相应的结果可表示为更强的形式.更多还原

【Abstract】 This paper discusses the necessary and sufficient conditions for the existence of unilateral limit of monotonic functions, based on the basic form of the Heine theorem, the definition of limit, and the principle of supremum and infimum. In conclusion, the corresponding results can be expressed in a stronger form.更多还原