| 1. | By representing the essential features of section function , and presenting the theorem on discussing the limit , continuity and derivative at the boundary of section function , the article shows the reason why to choose the boundary of section function to discuss , and the method how to discuss them , while discussing the limit , continuity and derivative of section function
摘要文章通过阐述分段函数的本质特征，给出讨论分段函数在分界点处极限、连续性及导数的定理，解决在讨论分段函数的极限、连续性及导数时，为什么要在分段函数的分界点处进行讨论以及怎样讨论的问题。 |
