最近看量子的文章中看到一个符号supp(f)，之前见过sup(f)问了老板，老板讲解相当于min最小值函数，sub(f)是对一个连续函数f求极小值，（好像是这样，说的不对请指出）。那么supp(f)呢？是一个supp函数还是一个sup函数加上一个p概率？

查了谷歌，在本站看到一位博主写的《函数的支集、支撑集、support、supp》文章https://blog.csdn.net/hqh45/article/details/44593883#commentBox ，知道了supp的符号是support的缩写，是支撑集的意思，但是具体的内容博主只甩了一个谷歌网站，这让没有梯子的兄dei可能望而却步了。那我在这里就做一个搬运工吧。以下是支撑集的维基百科中文释义。

这个我反正没看懂，也没看出和supp有什么关系，然后我去查了support的英文版维基百科的释义。我大体翻译一下。（英语渣）

Formulation：假设f : XR 是一个实值函数，其域(domain)为任意集。（算了，我还是直接把英文po上吧）

Supppose that f : XR  is a real-valued function whose domain is an arbitrary set X.The set_theoretic support of f,written supp(f), is the set of point in X where f is non-zero . The support of f is the smallest subset of X with the property  that f is zero on the subset's complement. If f(x)=0 for all but a finite number of points x in X,then f is said to have finite support.

If the set X has an additional structure (for example, a topology), then the support of f is defined in an analogous way as the smallest subset of X of an appropriate type such that f vanishes in an appropriate sense on its complement. The notion of support also extends in a natural way to functions taking values in more general sets than R and to other objects, such as measures or distributions.

下面就讲了紧支撑（closed support）、奇支撑、支撑族...