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I have found the same confusion seems to exist in various
authors' minds,
and consequently I have to make a lengthy explanation about
the terms. But
I'd still be interested in what the rest of the list does.
Does the term "displacement" refer to the vector r (from some
arbitrary
origin) or does it refer to r_2 - r_1 (i.e. final -
initial). They are
clearly not the same thing but it seems texts use
"displacement" for both
concepts.