微积分 wēijīfēn calculus Origin Definitions Defs Strokes Stroke Words Sentences Sents 微积分学 wēijīfēnxué calculus calculus; infinitesimal calculus微积分基本定理 wēijīfēnjīběndìnglǐ fundamental theorem of calculus the fundamental theorem of calculus, which links the concept of differentiating a function with the concept of integrating a function