In mathematics, mapping is a term that refers to the "corresponding" relationship between two groups of elements, and it is a noun. In mathematics and related fields, mapping or projection is usually equivalent to a function. Based on this, partial mapping is equivalent to partial function, and complete mapping is equivalent to complete function.

brief introduction

Mapping has many names in different fields, and its essence is the same. Such as functions, operators and so on. What needs to be explained here is that a function is a mapping between two data sets, and other mappings are not functions. One-to-one mapping (bijection) is a special mapping, that is, the only correspondence between two groups of elements, usually one-to-one (one-to-one).