For example, it is merely a convention, not a requirement of Maxwell's equations, that electrons have electric charge but not magnetic charge; after a ξ = π/2 transformation, it would be the other way around.
Näiteks on vaid kokkuleppeline, mitte aga Maxwelli võrrandite eeldus, et elektronidel on elektrilaeng, kuid puudub magnetlaeng; Pärast ξ = π/2 teisendust oleks olukord vastupidine.