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You've done everything right, except it is not "MeshElements" but "BoundaryElements" you're supposed to specify. This works: ToBoundaryMesh["Coordinates" -> coord, "BoundaryElements" -> {LineElement[incLst]}]


I am not sure what you mean by unexpected. If you do not see the region hole, then you might want to upgrade your version of Mathematica. Alternatively you could try ToElementMesh[Omega, "RegionHoles" -> {{0, 0}}]["Wireframe"] If that's not the issue, you'd need to clarify a bit what you would have expected. Another alternative is to try use ...

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