We give a general overview of various flavors of the equivalence principle in
    classical and quantum physics, with special emphasis on the so-called weak
    equivalence principle, and contrast its validity in mechanics versus field
    theory. We also discuss its generalisation to a theory of quantum gravity. Our
    analysis suggests that only the strong equivalence principle can be considered
    fundamental enough to be generalised to a quantum gravity context, since all
    other flavors of equivalence principle hold only approximately already at the
    classical level.

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