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Jan 6, 2019 at 18:02 vote accept CommunityBot
Dec 30, 2018 at 0:56 comment added Josiah Park Yes. The question of existence is already answered because of the existence of a solution with added conditions. One is free to change the constant $K$ that appears in the added constraints so there are in fact multiple solutions and so some additional constraints are needed generally to ensure uniqueness. As for general divergence form operators, on the first page of the paper there is mention of work by Olenik in this direction.
Dec 29, 2018 at 21:28 comment added user60665 Thank you. In that paper, the author uses a Neumann boundary condition at the interface. Is it really necessary to impose that to obtain wellposedness? Also has the case of general elliptic operators in divergence form been studied?
Dec 29, 2018 at 20:21 history answered Josiah Park CC BY-SA 4.0