Functions of a Complex Variable
This course is intended to serve as a formal introduction to the theory of functions of a single complex variable, enhancing its analytical and geometrical properties with the use of the computer. Complex variables have influenced a wide range of fields in science and in mathematics: from its applications to engineering, physics and quantum field theory, to helping the development of number theory, dynamical systems and algebraic geometry. This course aims to explain some of the main results for functions of a complex variable while providing sufficient mathematical background to understand computer experiments with conformal maps and iteration of complex polynomials.
Multivariable Calculus, Linear Algebra, Euclidean Geometry and some basic knowledge of complex numbers. Computer experiments will require some proficiency with Python.
During the course, students will:
Complex numbers, representations of complex numbers, stereographic projection, exponential and logarithm, powers and roots, phase visualization.
Derivative of a complex function, Cauchy-Riemann equations and holomorphic functions, inverse mapping theorem and the Jacobian, harmonic functions and conjugates, conformal maps and fractional linear transformations. Computer experiments.
Multi-calculus review, line integrals and Green’s Theorem. Fundamental Theorem of Calculus for holomorphic functions, Cauchy Theorem, Cauchy Integration Formula, Liouville’s Theorem, Morera’s Theorem and maximum modulus principle.
Sequences and series of functions. Power series and analytic functions. Power series as holomorphic functions. Meromorphic functions, Laurent series and isolated singularities. Residue Theorem and computation of integrals using residues.
Uniform and normal convergence of sequences. Fatou and Julia sets for iterated polynomials. The Mandelbrot set and computer experiments.
Two hours per week with a teaching assistant
Two midterm exams (30% each) and weekly homework assignments from which, the best ten assignments will be considered to obtain the remaining 40% of your final grade