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00925njm 22002777a 4500 dc Díaz-Cano Ocaña, Antonio author González Gascón, Francisco author Sánchez Soto, Luis Lorenzo author 2022-03 We investigate the behavior of the solutions of the ray equation in isotropic media. We discuss local and global transversals and wavefronts and give examples of rays without wavefronts. 2073-8994 10.3390/sym14030478 https://hdl.handle.net/20.500.14352/71401 https://doi.org/10.3390/sym14030478 https://www.mdpi.com On the ray-wavefront duality