Akwai wasu yunkurin da za a samu Lorentz canza ba tare da postulate na daidaito na gudun haske. Vladimir Ignatowski (1910) misali amfani da wannan manufa (a) da manufa na dangi, (b) homogeneity da isotropy sarari, da kuma (c) da ake bukata na reciprocity. Philipp Frank da Hermann Rothe (1911) bayar da hujjar cewa wannan samuwar ne bai cika ba, kuma yana bukatar ƙarin assumptions. nasu lissafi da aka dogara ne a kan assumptions cewa: (a) da Lorentz canji na samar da wani homogeneous mikakke kungiyar, (b) a lokacin da canza Frames, kawai da alamar da dangi gudun canje-canje, (c) contraction dogara ne kawai a kan dangi gudun. Duk da haka, bisa ga Pauli da Miller model sun kasa gano irin wannan invariant a cikin sauri tare da gudun haske, misali?
bai isa ba don gano saurin canzawa