Smoothed Projections over Weakly Lipschitz Domains

2016/12/08 by Martin W. Licht, Licht, Martin Werner
Mathematics · #58A12 #65N30 #Algebraic Geometry and Number Theory #FOS: Mathematics #Geometric Analysis and Curvature Flows #Nonlinear Partial Differential Equations #Numerical Analysis (math.NA)

paper · pdf · doi:10.48550/arxiv.1612.02756

openalex publication_date 2016/12/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We develop finite element exterior calculus over weakly Lipschitz domains. Specifically, we construct commuting projections from L^p de~Rham complexes over weakly Lipschitz domains onto finite element de~Rham complexes. These projections satisfy uniform bounds for finite element spaces with bounded polynomial degree over shape-regular families of triangulations. Thus we extend the theory of finite element differential forms to polyhedral domains that are weakly Lipschitz but not strongly Lipschitz. As new mathematical tools, we use the collar theorem in the Lipschitz category, and we show that the degrees of freedom in finite element exterior calculus are flat chains in the sense of geometric measure theory.

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