**Speaker:** Sione Ma

**Title:** Impact of Renewables on System Protection

**Date/Time:** October 2, 12:30

**Place:** FENS L035

**Abstract:** Given a complex polynomial $p$ in one variable, $\log|p|$ is a subharmonic function that grows like $(deg p)\log|z|$ as $|z|\to\infty$. Such functions are studied using complex potential theory, based on the Laplace operator in the complex plane.

Multivariable polynomials can also be studied using potential theory (more precisely, a non-linear version called pluripotential theory, which is based on the complex Monge-Ampere operator). In this talk I will motivate and define a notion of degree of a polynomial on an affine variety using pluripotential theory (Lelong degree). Using this notion, a straightforward calculation yields a version of Bezout's theorem. I will present some examples and describe how to compute Lelong degree explicitly on an algebraic curve. This is joint work with Jesse Hart.

**Contact:** Michel Lavrauw