Optimal conditions for $L^\infty$-regularity and a priori estimates for elliptic systems, I: two components

Details Optimal conditions for $L^\infty$-regularity and a priori estimates for elliptic systems, I: two components Optimal conditions for $L^\infty$-regularity and a priori estimates for elliptic systems, I: two components

2008-05-29

arxiv.org/abs/0805.4550v1

Mathematics

Analysis of PDEs

21pages

Scientific paper

In this paper we present a new bootstrap procedure for elliptic systems with two unknown functions. Combining with the $L^p$-$L^q$-estimates, it yields the optimal $L^\infty$-regularity conditions for the three well-known types of weak solutions: $H_0^1$-solutions, $L^1$-solutions and $L^1_\delta$-solutions. Thanks to the linear theory in $L^p_\delta(\Omega)$, it also yields the optimal conditions for a priori estimates for $L^1_\delta$-solutions. Based on the a priori estimates, we improve known existence theorems for some classes of elliptic systems.

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