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Geometric Optics Expansions for Hyperbolic Corner Problems II: From Weak Stability to Violent Instability
In this article we are interested in the rigorous construction of geometric optics expansions for weakly well-posed hyperbolic corner problems. More precisely we focus on the case where self-interacting phases occur and where one of them is exactly the phase where the uniform Kreiss--Lopatinskii condition fails. We show that the …