The curriculum of functions of a real variable is the class of the connecting link between the preceding and the following.
实变函数课是一门"承上启下"的课。
参考来源 - 刍议实变函数课的“承上启下”作用
实变函数 - 引用次数：1参考来源 - 刍议实变函数课的"承上启下"作用 On the Function of a Connecting Link between the Preceding and the Following in the Curriculum of Functions of a Real Variable