(Lorentzian) Scale Relativity Principle
The scale relativity extends to scales the reasoning made by Einstein on speeds in special relativity: just like a constant speed in Maxwell's equations, which does not appear to depend on the speed of the observer, suggests that the law of combination of speeds must preserve this invariant, similarly, the appearance of a constant length in Schrödinger's equation suggests that the law of combination of scales must preserve this invariant. In other words, just like is a physical speed limit, is a physical length limit.
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