Mathematics – Analysis of PDEs
Scientific paper
2008-08-19
Mathematische Zeitschrift 265, 2 (2010) 297-320
Mathematics
Analysis of PDEs
23 pages
Scientific paper
10.1007/s00209-009-0517-8
We study integral operators related to a regularized version of the classical Poincar\'e path integral and the adjoint class generalizing Bogovski\u{\i}'s integral operator, acting on differential forms in $R^n$. We prove that these operators are pseudodifferential operators of order -1. The Poincar\'e-type operators map polynomials to polynomials and can have applications in finite element analysis. For a domain starlike with respect to a ball, the special support properties of the operators imply regularity for the de Rham complex without boundary conditions (using Poincar\'e-type operators) and with full Dirichlet boundary conditions (using Bogovski\u{\i}-type operators). For bounded Lipschitz domains, the same regularity results hold, and in addition we show that the cohomology spaces can always be represented by $C^\infty$ functions.
Costabel Martin
McIntosh Alan
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