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导数 dy dx 是不是一个整体符号？ - 知乎 更新： 之所以写这个答案，是因为看过很多答案将dx，dy理解成微分，然后来解释微积分符号的含义。这样解释在我看来过于复杂——没有说它们不对，而是复杂。 我之所以不愿意在一元函数阶段引入微分，就是因为我认为，引入「微分」来解释过于复杂： 需要额外定义「微分」到底是什么意思
What is $dx$ in integration? - Mathematics Stack Exchange The symbol used for integration, $\int$, is in fact just a stylized "S" for "sum"; The classical definition of the definite integral is $\int_a^b f (x) dx = \lim_ {\Delta x \to 0} \sum_ {x=a}^ {b} f (x)\Delta x$; the limit of the Riemann sum of f (x) between a and b as the increment of X approaches zero (and thus the number of rectangles approaches infinity)