# Mathematics Colloquium - Chunmei Wang

This event is in the past.

**Speaker:** Chunmei Wang, University of Florida

**Title:** Efficient Numerical Methods for Weak Solutions of Partial Differential Equations

**Abstract:** Approximating weak solutions of partial differential equations (PDEs) is known to be important and extremely challenging in scientific computing and data science. In this talk, the speaker will discuss two kinds of numerical methods for weak solutions: (1) Primal-Dual Weak Galerkin (PDWG) finite element methods for low-dimensional PDEs; and (2) Deep Learning methods (Friedrichs Learning) for high-dimensional PDEs. The essential idea of PDWG is to interpret the numerical solutions as a constrained minimization of some functionals with constraints that mimic the weak formulation of the PDEs by using weak derivatives. The resulting Euler-Lagrange formulation results in a symmetric scheme involving both the primal variable and the dual variable (Lagrangian multiplier). Friedrichs Learning is a novel deep learning methodology that could learn the weak solutions of PDEs via a mini-max optimization characterization of the original problem. The speaker will explain what Friedrichs Learning is and how it can be used for solving PDEs with discontinuous solutions without any prior knowledge of the solution discontinuity.

**Zoom Link:** https://wayne-edu.zoom.us/j/91964836098?pwd=SzFyV2xneVdVWkx2anViNkN3WUE3dz09

Meeting ID: 919 6483 6098

Passcode: 606720

## Contact

Department of Mathematics

313-577-2479

math@wayne.edu