In mathematics, antiholomorphic functions (also called antianalytic functions) are a family of functions closely related to but distinct from holomorphic functions.

A function of the complex variable z defined on an open set in the complex plane is said to be antiholomorphic if its derivative with respect to z exists in the neighbourhood of each and every point in that set, where z is the complex conjugate.

There is an entry about the concept of an anti-holomorphic function in the Encyclopedia of Mathematics.[1] According to this entry the term anti-analytic function refers to the same concept. Anti-holomorphic function and anti-analytic function are synonyms of each other. According to [1]

'[a] function \( {\displaystyle f(z)=u+iv} \) of one or more complex variables \( {\displaystyle z=\left(z_{1},\dots {},z_{n}\right)\in {\bf {C}}^{n}} \) [is said to be anti-holomorphic if is the complex conjugate of a holomorphic function \( {\displaystyle {\overline {f\left(z\right)}}=u-iv}'. \)

One can show that if f(z) is a holomorphic function on an open set D, then f(z) is an antiholomorphic function on D, where D is the reflection against the x-axis of D, or in other words, D is the set of complex conjugates of elements of D. Moreover, any antiholomorphic function can be obtained in this manner from a holomorphic function. This implies that a function is antiholomorphic if and only if it can be expanded in a power series in z in a neighborhood of each point in its domain. Also, a function f(z) is antiholomorphic on an open set D if and only if the function f(z) is holomorphic on D.

If a function is both holomorphic and antiholomorphic, then it is constant on any connected component of its domain.

Encyclopedia of Mathematics, Springer and The European Mathematical Society,, As of 11 September 2020, This article was adapted from an original article by E. D. Solomentsev (originator), which appeared in Encyclopedia of Mathematics, ISBN 1402006098.

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