## Equation Level Matching: An Extension of the Method of Matched Asymptotic Expansion for Problems of Wave Propagation

We introduce an alternative to the method of matched asymptotic expansions. In the “traditional” implementation, approximate solutions, valid in different (but overlapping) regions, are matched by using “intermediate” variables. Here we propose to match at the level of the equations involved, via a “uniform expansion” whose equations enfold those of […]