2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17654This comment concerns the homogenization of 2D dielectric photonic crystals, and the fact that the limits $k\to 0$ ($k$ is the Bloch vector) and $ε\to +\infty $ do not commute for $p$-polarized waves4 pages, 1 figure, submitted to Phys. Rev. LettMaterials Sciencetext