Abstract
We prove that the one-sided condition λ* <λ does not imply a priori estimates at the boundary for weak solutions of nonlinear diagonal systems, even for two independent variables.
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Meier, M. Counter-examples to boundary estimates for two-dimensional elliptic systems. Manuscripta Math 44, 59–70 (1983). https://doi.org/10.1007/BF01166074
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DOI: https://doi.org/10.1007/BF01166074