Abstract
We use maximum principle techniques to obtain a Harnack inequality for two-dimensional elliptic operators
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Pucci, P., Serrin, J. The Harnack inequality in ℝ2 for quasilinear elliptic equations. J. Anal. Math. 85, 307–321 (2001). https://doi.org/10.1007/BF02788085
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DOI: https://doi.org/10.1007/BF02788085