Abstract
The result of Ladyzenskaya on global bounds for weak solutions of elliptic equations is carried over to certain quasilinear elliptic systems in diagonal form. A generalization of De Giorgi's example shows that there are unbounded weak solutions for systems with only “small” deviation from the diagonal form.
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Landes, R. Some remarks on bounded and unbounded weak solutions of elliptic systems. Manuscripta Math 64, 227–234 (1989). https://doi.org/10.1007/BF01160121
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DOI: https://doi.org/10.1007/BF01160121