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Mollification in Strongly Lipschitz Domains with Application to Continuous and Discrete De Rham Complexes

  • Alexandre Ern and Jean-Luc Guermond EMAIL logo
Published/Copyright: December 15, 2015

Abstract

We construct mollification operators in strongly Lipschitz domains that do not invoke non-trivial extensions, are Lp stable for any real number p[1,], and commute with the differential operators ∇, ×, and ·. We also construct mollification operators satisfying boundary conditions and use them to characterize the kernel of traces related to the tangential and normal trace of vector fields. We use the mollification operators to build projection operators onto general H1-, H( curl )- and H( div )-conforming finite element spaces, with and without homogeneous boundary conditions. These operators commute with the differential operators ∇, ×, and ·, are Lp-stable, and have optimal approximation properties on smooth functions.

Funding source: National Science Foundation

Award Identifier / Grant number: DMS-1015984, DMS-1217262

Funding source: Air Force Office of Scientific Research, USAF

Award Identifier / Grant number: FA99550-12-0358

The authors acknowledge fruitful discussions with S. H. Christiansen and A. Demlow.

Received: 2015-09-09
Accepted: 2015-10-24
Published Online: 2015-12-15
Published in Print: 2016-01-01

© 2016 by De Gruyter

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