Multilevel Monte Carlo Methods for Random Differential Equations - Part I

Learn multilevel Monte Carlo methods for solving random differential equations in this comprehensive lecture that introduces fundamental concepts for handling uncertainty in mathematical models. Explore how physical systems governed by partial differential equations with uncertain parameters and dynamical systems subject to random fluctuations can be analyzed using advanced computational techniques. Begin with the standard Monte Carlo method combined with differential equation discretization to compute expectations of quantities of interest, then examine the critical relationship between discretization error and Monte Carlo error. Discover the multilevel Monte Carlo paradigm through detailed analysis of its mathematical properties and practical implementation strategies, including extensions for computing moments and statistical measures of output quantities. Compare this approach with the related multifidelity Monte Carlo method to understand different computational strategies for uncertainty quantification. Gain insights into how these techniques apply to real-world problems including PDE-constrained optimization under uncertainty and sequential data assimilation, providing a solid foundation for advanced applications in computational mathematics and engineering.