# Linear function

## Linear map or polynomial function of degree one / From Wikipedia, the free encyclopedia

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For the use of the term in calculus, see Linear function (calculus).

In mathematics, the term **linear function** refers to two distinct but related notions:^{[1]}

- In calculus and related areas, a linear function is a function whose graph is a straight line, that is, a polynomial function of degree zero or one.
^{[2]}For distinguishing such a linear function from the other concept, the term*affine function*is often used.^{[3]} - In linear algebra, mathematical analysis,
^{[4]}and functional analysis, a linear function is a linear map.^{[5]}