Principle of material objectivity
Principle of material objectivity is an obsolete term and should be replaced by principle of material frame-indifference. ("I was responsible for introducing the obsolete term in 1958 and now regret that I misled a lot of people",
Walter Noll). Here is a precise statement of the Principle:
The constitutive laws governing the internal interactions between the parts of a physical system should not depend on whatever external
frame of referenceis used to describe them.
(See parts  and  of "Five Contributions to Natural Philosophy", available on the website [http://www.math.cmu.edu/~wn0g/noll] .)Note: A
frame of referenceis very different from a coordinate system. Contrary of some people's opinion, the principle has nothing to do with coordinate systems.
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