within the past light cone to the given event). The length of M is called the proper time of the worldline or particle. The future of the given event is formed by all events that can be reached through time-like curves lying within the future light cone. For easy visualizations of four dimensions, two space coordinates are often suppressed. See also for example Eddington-Finkelstein coordinates. The term is now most often used in relativity theories (i.e., special relativity and general relativity ).
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