# Linear map

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In mathematics, and more specifically in linear algebra, a linear map (also called a linear mapping, linear transformation, vector space homomorphism, or in some contexts linear function) is a mapping ${\displaystyle V\to W}$ between two vector spaces that preserves the operations of vector addition and scalar multiplication. The same names and the same definition are also used for the more general case of modules over a ring; see Module homomorphism.
If a linear map is a bijection then it is called a linear isomorphism. In the case where ${\displaystyle V=W}$, a linear map is called a linear endomorphism. Sometimes the term linear operator refers to this case,[1] but the term "linear operator" can have different meanings for different conventions: for example, it can be used to emphasize that ${\displaystyle V}$ and ${\displaystyle W}$ are real vector spaces (not necessarily with ${\displaystyle V=W}$),[citation needed] or it can be used to emphasize that ${\displaystyle V}$ is a function space, which is a common convention in functional analysis.[2] Sometimes the term linear function has the same meaning as linear map, while in analysis it does not.