指示函数
Sign in to saveAlso known as characteristic function
function that returns 1 if an element is present in a specified subset and 0 if absent; naturally isomorphic with a set's subsets
Article · 中文
在集合論中,指示函数是定义在某集合X上的函数,表示其中有哪些元素属于某一子集A。 现在已经少用这一称呼。概率论有另一意思迥异的特征函数。 集X的子集A的指示函数是函数,定义为 A的指示函数也记作或。
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