Abstract
The first invariance principle, called “meaningfulness,” is germane to the common practice requiring that the form of a scientific law must not be altered by a change of the units of the measurement scales. By itself, meaningfulness does not put any constraint on the possible data. The second principle requires that the output variable is “order-invariant” with respect to any transformation (of one of the input variables) belonging to a particular family or class of such transformations which are characteristic of the law. These principles are formulated as axioms of a theory. Taken together, meaningfulness and order-invariance axioms have strong consequences on the feasible theories. Three applications of our results are discussed in details, involving the Lorentz–FitzGerald contraction, Beer's law, and the Monomial laws, each of which is derived from three axioms implementing meaningfulness and order-invariance concepts. (An “initial condition” axiom is also used.) Not all scientific laws are order-invariant in the sense of this paper. An example is van der Waals' equation.
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Falmagne, JC. Meaningfulness and Order-Invariance: Two Fundamental Principles for Scientific Laws. Foundations of Physics 34, 1341–1384 (2004). https://doi.org/10.1023/B:FOOP.0000044096.50863.8e
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DOI: https://doi.org/10.1023/B:FOOP.0000044096.50863.8e