What we have to do to avoid using “t” is simply to restrict ourselves to list the variables A, B, C... that we effectively observe, and establish relations between these variables. We have to write equations for the functions A(B), B(C), C(A)... that we do observe; and not for the functions A(t), B(t), C(t), that we do not observe. In the example, we will not have the pulse and the pendulum that both evolve in time, but only equations that tell us how the one and the other may evolve with respect to one another. Not “how many beats per second and how many oscillations per second”; but only
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