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regularity of solutions of PDEs.

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Poisson equation in a periodic strip

I'd like to say that the Laplacian associated with these boundary conditions is invertible, with compact inverse with elliptic regularity estimates of the form $$\|u\|_{H^2}\le C\|f\|_{L^2}.$$ Here's what … that I've stated, we need not worry about a nonsmooth transition from Dirichlet to Neumann boundary conditions (the corresponding boundary portions are strictly disjoint), so I suspect that elliptic regularity