What is inclusion function?

In mathematics, if A {\displaystyle A} is a subset of B {\displaystyle B} , then the inclusion map (also inclusion function, insertion, or canonical injection) is the function ι {\displaystyle \iota } that sends each element, x {\displaystyle x} , of A {\displaystyle A} to x {\displaystyle x} , treated as an element of B {\displaystyle B} :
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