> For the complete documentation index, see [llms.txt](https://yingshaoxo.gitbook.io/university-notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yingshaoxo.gitbook.io/university-notes/high-level-math/multivariable-calculus.md).

# Multivariable calculus

`multiple variable calculus`, that is to say: a function which have multiple parameters, and you must do calculus with it.

Multi-variable calculus (also known as multivariate calculus) is the extension of calculus in one variable to calculus with functions of several variables: the differentiation and integration of functions involving multiple variables, rather than just one.

~~Why we have to learn it? Well, simply enough, when you trying to get an object's volume, all you have to do is find its~~ `2-D area formula`~~, then do integration with its height.~~