Vern S. Poythress, “Semiotic Analysis of the Observer in Relativity, Quantum Mechanics, and a Possible Theory of Everything” (PDF), Semiotica 2015; 205: 149–167. Used with permission.
[Note: in the published article, there is a typographical error on p. 162, in the first sentence. The sentence should have an added word “not”:
Within classical mechanics, when we use these nonlinear coordinate systems, the standard elementary Newtonian equation F = ma does not retain its standard form.