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Jan 16, 2023 at 16:33 comment added Giorgio Metafune Yes, but this depends on the divergence form of the operator. If the operator is in not in divergence form, the interior estimates are true in case of continuous coefficeints.
Jan 15, 2023 at 14:53 comment added Simmetrico Thanks! So the regularity of second order is strictly correlated to the derivative of A
Jan 14, 2023 at 20:46 history answered Connor Mooney CC BY-SA 4.0