Abstract
In a non linear electromagnetic isotropic medium the wave, radial and shock velocities do not exceed light speed iff some simple conditions are satisfied.
Sunto
Si danno condizioni necessarie e sufficienti par la limitatezza delle vélocitá d'onda, radiale e d'urto nei materiali elettromagnetici isotropi non lineari.
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Boillat, G., Giannone, A. A constraint on wave, radial and shock velocities in nonlinear electromagnetic materials. Z. angew. Math. Phys. 40, 285–289 (1989). https://doi.org/10.1007/BF00945003
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DOI: https://doi.org/10.1007/BF00945003