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...7|archive-date=11 December 2015|archive-url=https://wayback.archive-it.org/all/20151211015729/http://plato.stanford.edu/entries/newton-stm/|url-status=liv ...us the position in time (Fig.&nbsp;1). An event is represented by a set of coordinates ''x'', ''y'', ''z'' and ''t''.<ref name="Fock_1966">{{cite book |last1=Fock ...