wichita.edu
…is the branch of mathematical analysis that investigates functions of complex numbers. It is useful in many branches of mathematics, including algebraic geometry, number theory, applied mathematics; as well as in physics. Complex analysis is particularly concerned with the analytic functions of complex variables (or, more generally, meromorphic functions).…
https://www.wichita.edu/academics/fairmount_las/mathematics/mathstat/research/analysis_and_complex_analysis.php