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Semilinear Mixed Problems on Hilbert Complexes and Their Numerical Approximation

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Abstract

Arnold, Falk, and Winther recently showed (Bull. Am. Math. Soc. 47:281–354, 2010) that linear, mixed variational problems, and their numerical approximation by mixed finite element methods, can be studied using the powerful, abstract language of Hilbert complexes. In another recent article (arXiv:1005.4455), we extended the Arnold–Falk–Winther framework by analyzing variational crimes (à la Strang) on Hilbert complexes. In particular, this gave a treatment of finite element exterior calculus on manifolds, generalizing techniques from surface finite element methods and recovering earlier a priori estimates for the Laplace–Beltrami operator on 2- and 3-surfaces, due to Dziuk (Lecture Notes in Math., vol. 1357:142–155, 1988) and later Demlow (SIAM J. Numer. Anal. 47:805–827, 2009), as special cases. In the present article, we extend the Hilbert complex framework in a second distinct direction: to the study of semilinear mixed problems. We do this, first, by introducing an operator-theoretic reformulation of the linear mixed problem, so that the semilinear problem can be expressed as an abstract Hammerstein equation. This allows us to obtain, for semilinear problems, a priori solution estimates and error estimates that reduce to the Arnold–Falk–Winther results in the linear case. We also consider the impact of variational crimes, extending the results of our previous article to these semilinear problems. As an immediate application, this new framework allows for mixed finite element methods to be applied to semilinear problems on surfaces.

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  1. Department of Mathematics, University of California, San Diego, 9500 Gilman Dr #0112, La Jolla, CA, 92093-0112, USA

    Michael Holst & Ari Stern

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  1. Michael Holst
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  2. Ari Stern
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Correspondence to Ari Stern.

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Communicated by Elizabeth Mansfield.

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Holst, M., Stern, A. Semilinear Mixed Problems on Hilbert Complexes and Their Numerical Approximation. Found Comput Math 12, 363–387 (2012). https://doi.org/10.1007/s10208-011-9110-8

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  • DOI: https://doi.org/10.1007/s10208-011-9110-8

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