Function theory may refer to:
Theory of functions of a real variable, the traditional name of real analysis, a branch of mathematical analysis dealing with the real numbers and real-valued functions of a real variable
Theory of functions of a complex variable, the historical name for complex analysis, the branch of mathematical analysis that investigates functions of complex numbers
Constructive function theory, the study of the connection between the smoothness of a function and its degree of approximation
Geometric function theory, the study of geometric properties of analytic functions
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
Hellenica World - Scientific Library
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